JP2017193015A - Valve spring compression tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve spring compression tool which allows an operator to efficiently perform compression work without variations in a load applied to the operator during the compression work of the valve spring.SOLUTION: A valve spring compression tool comprises: a linear slide rail 2; a slide member 3 slidably mounted to the slide rail 2 and having a screw hole 3b; and a rod-like screw member 4 screwed into the screw hole 3b so as to be screwed and unscrewed. A pair of guide members 6 guide each end of the slide rail 2 in a direction orthogonal to the slide rail 2 and in a direction crossing the screw member 4. A mounting member 7 detachably mounts both guide members 6 to a cylinder head 10. A pressing member 5 is mounted to the screw member 4. The pressing member 5 presses a retainer 13 toward the cylinder head 10 against an urging force of a valve spring 12 by a screwing motion of the screw member 4 to the cylinder head 10 side to compress the valve spring 12.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a valve spring compression tool for compressing a valve spring when the valve spring is removed from the cylinder head of the internal combustion engine or when the valve spring is attached to the cylinder head.

  Conventionally, a plurality of valves are attached to a cylinder head of a vehicle engine. Each valve includes an umbrella portion and a shaft portion where the umbrella portion is continuous at one end, and the shaft portion is slidably inserted into the plurality of guide holes provided in the cylinder head from the other end side. The other end portion of the shaft portion is inserted into a tapered hole of the retainer that forms a ring shape in a state where the valve spring is wound, and the tapered hole has a shape that linearly decreases in diameter toward the cylinder head side. ing. One end of the valve spring is in contact with the periphery of the guide hole, while the other end of the valve spring is in contact with the retainer. When a pair of cotters are arranged on both sides in the radial direction on the other end side of the shaft portion and fitted into the tapered hole from the opposite side of the cylinder head, the retainer is moved away from the cylinder head by the urging force of the valve spring. The two cotters are pushed by the inner peripheral surface of the tapered hole in conjunction with the moving operation, and the other end side of the shaft portion is sandwiched in the radial direction so that the valve is integrated with the valve spring and the retainer into the cylinder head. It is supposed to be attached to.

  By the way, when removing the valve spring from the cylinder head or attaching the valve spring to the cylinder head, the retainer is moved in the direction approaching the cylinder head against the urging force of the valve spring to compress both valve springs. It is necessary to make the cotter fit into the tapered hole or be separated from the tapered hole.

  In the operation of compressing the valve spring, a valve spring compression tool is used to easily perform the compression operation. For example, a valve spring compression tool disclosed in Patent Document 1 includes a linear slide rail extending along the longitudinal direction of a cylinder head, and a slide member is slidably attached to the slide rail. One end of a rotation shaft extending in the horizontal direction perpendicular to the slide rail is pivotally supported on the slide member, and the rotation shaft can be rotated up and down. A pressing member is attached to the middle portion of the rotation shaft so as to be slidable in the extending direction of the rotation shaft. Then, the pressing member is moved to the position of the valve spring to be compressed by the sliding operation of the sliding member and the pressing member, and the rotating shaft is rotated downward with the other end side of the rotating shaft. Thus, the valve spring is compressed by pressing the retainer downward with the pressing member.

Japanese Utility Model Publication No. 63-172576

  However, in Patent Document 1, the retainer is pressed by a pressing member according to the principle of leverage. When the pressing member is moved close to the slide rail and the valve spring is compressed, the valve spring is moved away from the slide rail. The force applied to the rotating shaft by the operator greatly changes when the compression work is performed. In particular, if the compression work of the valve spring is performed in a state where the pressing member is separated from the slide rail, it becomes necessary for the operator to apply a large force to the rotating shaft, so that the compression work may not be performed efficiently. There is.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a valve spring capable of efficiently performing a compression operation without variation in load applied to an operator during the compression operation of the valve spring. It is to provide a compression tool.

  In order to achieve the above object, the present invention has been devised so that the compression work of a plurality of valve springs attached to the cylinder head can be efficiently performed while maintaining a predetermined distance between the slide rail and the pressing member. It is characterized by that.

  Specifically, when the valve spring for urging the intake or exhaust valve is attached to the cylinder head of the internal combustion engine or removed from the cylinder head, the valve spring is pressed toward the cylinder head. The following solutions were taken for the valve spring compression tool to be compressed.

  That is, in the first invention, a slide member having a linear slide rail extending along the longitudinal direction of the cylinder head and a screw hole slidably attached to the slide rail and extending toward the cylinder head. And a rod-shaped screw member that is screwed into the screw hole so as to be able to advance and retreat, and the slide rail so that the slide rail moves in a direction orthogonal to the slide rail and in a direction intersecting with the screw member. A pair of guide members for guiding each end portion of the rail; and an attachment member for attaching the both guide members to the cylinder head. The screw member has a sliding operation of the slide member and the both on the cylinder head side. The screw member is caused to correspond to the valve spring by the guide operation of the slide rail in the guide member, One, wherein the pressing member for pressing the valve spring to the cylinder head side screwed operation to the cylinder head side of the screw member.

  According to a second invention, in the first invention, a pair of the slide rails are juxtaposed in the guide direction of the both guide members, the slide members bridge the slide rails, and the screw holes are And is formed so as to correspond to both the slide rails.

  According to a third invention, in the first or second invention, the attachment member includes a linear connection frame that connects between the middle portions of the lower surfaces of the guide members, and a predetermined interval in the longitudinal direction of the connection frame. A pair of leg frames that extend in parallel toward the cylinder head, and an attachment frame that connects the extended ends of the leg frames and is attached to the cylinder head, and the screw holes are formed on the screw holes. When the guide member guides the slide rail to one side, it corresponds to a space on one side of the connecting frame, while when the guide members guide the slide rail to the other side, the other side of the connecting frame. It is characterized in that it corresponds to the other space.

  In the first invention, since the pressing member is moved together with the slide rail in the direction orthogonal to the slide rail by the guide operation of the slide rail by both guide members, the position of the pressing member is moved by the slide operation of the slide member and the guide member guide operation. The positional relationship between the slide rail and the pressing member does not change even if the compression work of each valve spring is performed while changing the position. Therefore, the operator does not need to apply a large force to the rotating shaft when the operator performs the compression work of the valve spring in a state where the pressing member as in the cited document 1 is largely separated from the slide rail. Work can be performed efficiently.

  In the second invention, since the pressing member is located at a position corresponding to between the slide rails, when the valve member is compressed by the pressing member, if the screw member is screwed, the pressing member is pressed from both the slide rails via the screw member. Force is applied to the member in a balanced manner. Therefore, the compression work of the valve spring can be performed with the minimum necessary pressing force, and the load applied to both slide rails during the compression work of the valve spring is distributed in a well-balanced manner. Hard to occur.

  In the third invention, when the slide rail is guided to one side by both guide members in a state in which the attachment frame is attached to the central portion of the upper surface of the cylinder head in a posture along the longitudinal direction of the cylinder head, it intersects the longitudinal direction of the cylinder head. It is possible to sequentially compress a plurality of valve springs arranged in the longitudinal direction of the cylinder head while moving the slide member along the slide rail in the region on the one side in the horizontal direction, while the guide rail allows the slide rail to be moved to the other side. In this way, a plurality of valve springs arranged in the longitudinal direction of the cylinder head can be sequentially compressed while moving the slide member along the slide rail in the region on the other side in the horizontal direction intersecting the longitudinal direction of the cylinder head. It becomes like this. Therefore, in a cylinder head of an internal combustion engine having a general valve arrangement, all the valve springs can be compressed without changing the mounting position of the tool with respect to the cylinder head, which is efficient.

It is a disassembled perspective view of the valve spring compression tool which concerns on embodiment of this invention. It is a front view of the valve spring compression tool concerning the embodiment of the present invention. It is sectional drawing in the III-III line of FIG. It is a schematic front view which shows the state just before performing the compression operation | work of a valve spring using the valve spring compression tool which concerns on embodiment of this invention. It is sectional drawing in the VV line of FIG. It is an expanded sectional view around a retainer showing a state just before performing valve spring compression work using a valve spring compression tool concerning an embodiment of the present invention. It is an expanded sectional view around a retainer showing the state in the middle of performing compression work of a valve spring using a valve spring compression tool concerning an embodiment of the present invention. It is an expanded sectional view around a retainer showing the state immediately after the end of compression work of a valve spring using the valve spring compression tool concerning an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.

  1 to 3 show a valve spring compression tool 1 according to an embodiment of the present invention. As shown in FIGS. 4 and 5, the valve spring compression tool 1 is a valve that biases an intake or exhaust valve 11 against a cylinder head 10 of a diesel engine 8 that is an internal combustion engine of a general vehicle. The spring 12 is used when the spring 12 is detached from the cylinder head 10 or attached to the cylinder head 10 and has a substantially T-shape when viewed from the front.

  Guide holes 10 a extending substantially in the vertical direction are provided in the horizontal one side region and the other side region intersecting with the longitudinal direction of the cylinder head 10 at predetermined intervals along the longitudinal direction of the cylinder head 10. It is provided one by one.

  The valve 11 includes an umbrella portion 11a and a shaft portion 11b in which the umbrella portion 11a is continuous at one end, and the shaft portion 11b is slidably fitted into the guide hole 10a from the other end side.

  A ring-shaped retainer 13 is disposed on the other end side of the shaft portion 11b. On the opposite side of the retainer 13 to the cylinder head 10, an overhanging portion 13a projecting outward is formed.

  In the center of the retainer 13, a tapered hole 13b that linearly decreases in diameter toward the cylinder head 10 side is formed, and the other end portion of the shaft portion 11b is inserted into the tapered hole 13b. ing.

  The valve spring 12 is wound around the other end of the shaft portion 11b, and one end is in contact with the periphery of the guide hole 10a and the other end is in contact with the retainer 13 so that the retainer 13 is separated from the cylinder head 10. It is supposed to be energized.

  In the tapered hole 13b, a pair of cotters 14 having a shape obtained by dividing a substantially frustoconical member whose outer peripheral surface corresponds to the inner peripheral surface of the tapered hole 13b by a plane passing through the central axis of the cylinder head 10 is provided. It can be fitted from the opposite side.

  The both cotters 14 are pushed by the inner peripheral surface of the tapered hole 13b in conjunction with the movement of the retainer 13 in the direction away from the cylinder head 10 by the urging force of the valve spring 12, and the other end side of the shaft portion 11b. Is attached to the cylinder head 10 integrally with the valve spring 12 and the retainer 13.

  As shown in FIG. 1 to FIG. 3, the valve spring compression tool 1 is provided with a pair of slide rails 2 having a rectangular cross section that is linear along the longitudinal direction of the cylinder head 10.

  A plate-like slide member 3 having a thickness is disposed between the slide rails 2, and the slide member 3 has a rectangular cross-section penetrating in a direction along the plate surface of the slide member 3. A pair of holes 3a are formed at predetermined intervals in the horizontal direction.

  The through holes 3a are fitted to the slide rails 2, and the slide member 3 bridges the slide rails 2 and is slidable along the slide rails 2. Yes.

  A fitting hole 3 d penetrating toward the cylinder head 10 is formed at a position corresponding to the space between the slide rails 2 in the slide member 3.

  The fitting hole 3d is fitted with a lower half portion of a cylindrical member 3c having a screw hole 3b extending along the center of the cylinder, and the upper half portion of the cylindrical member 3c extends from the surface side of the slide member 3. Jumping out.

  That is, the screw hole 3 b extends at a position corresponding to the space between the slide rails 2 and toward the cylinder head 10.

  A screw member 4 having a rod shape is screwed into the screw hole 3b so as to be able to advance and retract.

  The screw member 4 is screwed into the screw hole 3b from the distal end side, and a pair of handle bars 4a are arranged in the radial direction of the screw member 4 on the proximal end side of the screw member 4. And it protrudes in the direction away from each other.

  A pressing member 5 extending toward the cylinder head 10 is detachably attached to the tip of the screw member 4.

  The pressing member 5 has a hollow portion 5d that opens to the cylinder head 10 side, and a substantially cylindrical fixing portion 5a in which the opposite side of the cylinder head 10 is fixed to the tip of the screw member 4, and the fixing portion 5a. Connected to the pair of extending portions 5b extending from the peripheral edge of the opening of the fixed portion 5a toward the cylinder head 10 and the extending ends of the two extending portions 5b. An annular portion 5c having a central axis at the same position as the cylinder center of the fixed portion 5a is provided, and the annular portion 5c has a shape corresponding to the protruding portion 13a of the retainer 13.

  And when the said screw member 4 is screwed in the state attached to the front-end | tip of the screw member 4 screwed together in the said screw hole 3b, while the said press member 5 moves to the direction approaching the said cylinder head 10, while said When the screw member 4 is screwed out, it moves in a direction away from the cylinder head 10.

  A pair of rectangular parallelepiped guide members 6 extending in the juxtaposition direction of the slide rails 2 are disposed on both sides of the slide rails 2 in the longitudinal direction, and the guide members 6 open to opposite sides. A concave groove 6a is formed.

  One end of each slide rail 2 is slidably fitted into one groove 6a of each of the grooves 6a, while the other end of each slide rail 2 is connected to each of the grooves 6a. The other groove 6a is slidably fitted in the groove 6a.

  That is, the guide members 6 guide the slide rails 2 in a direction orthogonal to the slide rails 2 and in a direction intersecting with the screw members 4. Are aligned in the guide direction of the two guide members 6.

  A mounting member 7 is provided on the cylinder head 10 side of the both guide members 6 to attach the both guide members 6 to the cylinder head 10.

  As shown in FIGS. 2 and 3, the mounting member 7 includes a connecting frame 7a having a rectangular cross section that forms a straight line connecting the middle portions of the lower surfaces of the guide members 6, and a longitudinal direction of the connecting frame 7a. A pair of leg frames 7b having a round bar shape extending in parallel toward the cylinder head 10 and a plate attached to the cylinder head 10 and connecting the extending ends of the both leg frames 7b. And the width of the connecting frame 7a corresponds to the length between the slide rails 2.

  A plurality of fixing holes 7d are formed through the mounting frame 7c, and each fixing hole 7d has a central portion on the upper surface of the cylinder head 10 in a posture along the longitudinal direction of the cylinder head 10. If it goes to, it will be a position corresponding to an injector fixing bolt hole (not shown) for fixing an injector in the above-mentioned cylinder head 10. The mounting frame 7c is attached to the cylinder head 10 by inserting a bolt (not shown) through the fixing hole 7d and screwing it into the injector fixing bolt hole.

  In the valve spring compression tool 1 of the present invention, the fixing holes 7d are injectors in a plurality of different cylinder heads 10 so that the valve springs 12 can be compressed even if different types of cylinder heads 10 are used. A plurality of bolt holes are formed at positions corresponding to the fixing bolt holes.

  In each long side portion of the mounting frame 7c, four gently avoiding interference avoiding recesses 7e are formed at predetermined intervals, and each of the interference avoiding recesses 7e includes the pressing member 5 and the cylinder head 10. When moving in the direction of approaching, the interference of the pressing member 5 with the mounting member 7 is avoided.

  When the both guide members 6 guide the slide rails 2 to one side with the mounting frame 7c attached to the cylinder head 10, the screw hole 3b corresponds to the space S1 on one side of the connecting frame 7a. It is supposed to be.

  Further, when the guide members 6 guide the slide rails 2 to the other side with the attachment frame 7c attached to the cylinder head 10, the screw hole 3b is located in the space S2 on the other side of the connection frame 7a. It comes to correspond to.

  Then, the attachment member 7 is attached to the cylinder head 10 and, as shown in FIGS. 4 and 5, the screw member is moved by the slide operation of the slide member 3 and the guide operation of the slide rails 2 by the guide members 6. 4 and the pressing member 5 are made to correspond to the retainer 13, and the screw member 4 is screwed toward the cylinder head 10, whereby the pressing member 5 causes the retainer 13 to act as an urging force of the valve spring 12. The valve spring 12 is pressed against the cylinder head 10 to compress the valve spring 12.

  Further, as shown in FIGS. 6 to 8, both the cotters 14 are connected to the tapered holes 13b in conjunction with the moving operation of the retainer 13 in the direction approaching the cylinder head 10 against the urging force of the valve spring 12. The valve spring 12 is removed from the cylinder head 10 by releasing the pinching state on the other end side of the shaft portion 11b apart from the inner peripheral surface of the shaft 11b, or the valve spring 12 is attached to the cylinder head 10 You can also.

  Next, the operation of removing the valve spring 12 from the cylinder head 10 using the valve spring compression tool 1 will be described in detail.

  First, as shown in FIGS. 4 and 5, the worker attaches the attachment frame 7 c to the central portion of the upper surface of the cylinder head 10 in a posture along the longitudinal direction of the cylinder head 10. At this time, the pressing member 5 is removed from the screw member 4 and the screw member 4 is removed from the slide member 3.

  Next, the screw member 4 is screwed into the screw hole 3 b in a state where the slide rails 2 are guided to one side by the guide members 6, and the pressing member 5 is attached to the tip of the screw member 4.

  Then, the slide member 3 is slid and the both guide rails 6 are used to guide the slide rails 2 so as to be positioned in one region in the direction intersecting the longitudinal direction of the cylinder head 10 as shown in FIG. The pressing member 5 is moved to above the valve spring 12 that performs the removing operation among the valve springs 12.

  Thereafter, the operator holds the handle bar 4a and rotates the screw member 4. Then, when the screw member 4 is screwed toward the cylinder head 10, the pressing member 5 moves so as to approach the cylinder head 10, and as shown in FIG. 7, the annular portion 5 c moves the retainer 13 toward the cylinder head 10. Press.

  The retainer 13 pressed to the cylinder head 10 side moves in a direction approaching the cylinder head 10 against the urging force of the valve spring 12, and in conjunction with this movement operation, the both cotters 14 are moved into the tapered holes 13b. Separate from the peripheral surface. Then, the pinching of the other end side of the shaft portion 11b in both the cotters 14 is released, and the valve spring 12 is separated from the valve 11 and can be detached from the cylinder head 10 as shown in FIG.

  Thereafter, the slide member 3 is slid and the pressing member 5 is moved above the valve spring 12 to be removed next, and the valve spring 12 is removed in the same procedure as described above.

  Next, when the removal work of all the valve springs 12 located in one region in the direction intersecting the longitudinal direction of the cylinder head 10 is completed, the pressing member 5 is removed from the screw member 4 and the screw member 4 is removed from the slide member 3. Remove from.

  Next, after both the slide rails 2 are guided to the other side by the guide members 6, the screw member 4 is screwed into the screw hole 3 b and the pressing member 5 is attached to the tip of the screw member 4.

  Thereafter, the slide member 3 is slid and the guide rails 6 are guided by the guide members 6 to remove the valve springs 12 located in the other region in the direction intersecting the longitudinal direction of the cylinder head 10. Repeat in order.

  The operation of attaching the valve spring 12 to the cylinder head 10 can be performed by reversing the procedure of the operation of removing the valve spring 12 from the valve 11 described above.

  As described above, according to the embodiment of the present invention, the pressing member 5 is moved together with the slide rail 2 in the direction orthogonal to the slide rail 2 by the guide operation of the slide rail 2 by the both guide members 6. The positional relationship between the slide rail 2 and the pressing member 5 does not change even when the compression work of each valve spring 12 is performed while changing the sliding operation of the sliding member 3 and the guiding operation of both guide members 6. Therefore, there is no need to apply a large force to the rotating shaft when the operator performs the compression work of the valve spring in a state where the pressing member as in the cited document 1 is largely separated from the slide rail. Compression work can be performed efficiently.

  Further, a pair of both slide rails 2 are arranged in the guide direction of both guide members 6, and the screw holes 3 b correspond between both slide rails 2, so that the pressing member 5 corresponds between both slide rails 2. It becomes the position to do. Therefore, when compressing the valve spring 12 with the pressing member 5, if the screw member 4 is screwed, force is applied to the pressing member 5 from both slide rails 2 through the screw member 4 in a well-balanced manner. The compression of the valve spring 12 can be performed with the pressing force, and the load applied to the slide rails 2 during the compression operation of the valve spring 12 is distributed in a well-balanced manner, so that deformation and breakage around the slide rails 2 occur. Hateful.

  Further, when the slide rail 2 is guided to one side by the both guide members 6 in a state where the mounting frame 7c is mounted on the center portion of the upper surface of the cylinder head 10 in a posture along the longitudinal direction of the cylinder head 10, the longitudinal direction of the cylinder head 10 While the slide member 3 is moved along the slide rail 2 in the region on the one side in the horizontal direction intersecting with the cylinder head 10, the plurality of valve springs 12 arranged in the longitudinal direction of the cylinder head 10 can be compressed in order. When the slide rail 2 is guided to the other side by 6, a plurality of rows arranged in the longitudinal direction of the cylinder head 10 while moving the slide member 3 along the slide rail 2 in a region on the other side in the horizontal direction intersecting the longitudinal direction of the cylinder head 10. In order to compress the valve spring 12 Ukoto so that it is. Therefore, in the cylinder head 10 of an internal combustion engine having a general arrangement of the valves 11, all the valve springs 12 can be compressed without changing the mounting position of the valve spring compression tool 1 with respect to the cylinder head 10. It is.

  In the embodiment of the present invention, the structure in which both guide members 6 linearly guide both slide rails 2 so as to cope with the compression work of each valve spring 12 of a diesel engine in which the posture of each valve 11 is directed vertically. However, for example, both guide members 6 slide in both directions so that each valve 11 can cope with the compression work of each valve spring 12 of a gasoline engine in which the posture of each valve 11 is inclined in the opposite direction across the central portion of the cylinder head 10. A structure in which the rail 2 is guided in a curved shape may be used.

  In the embodiment of the present invention, the slide member 3 is slid by the two slide rails 2, but the structure may be such that the slide member 3 is slid by one slide rail 2, or three or more. The slide member 3 may be slid by the slide rail 2.

  Further, in the embodiment of the present invention, the pressing member 5 is pressed against the retainer 13 by the screwing operation of the screw member 4, but the screw member 4 is used as a slide rod and the pressing member 5 is moved by the sliding operation of the slide rod. 13 may be pressed.

  In addition, in the embodiment of the present invention, the pressing member 5 presses the retainer 13 in a state where the annular portion 5c is in contact with the upper surface of the overhanging portion 13a. A structure in which the pressing member 5 presses the retainer 13 in a state where the outer peripheral edge portion of the protruding portion 13a can be fitted to the outer peripheral edge and the annular portion 5c is fitted to the protruding portion 13a may be used.

  The present invention is suitable for a valve spring compression tool that removes a valve spring from a cylinder head of an internal combustion engine or compresses the valve spring when the valve spring is attached to the cylinder head.

DESCRIPTION OF SYMBOLS 1 Valve spring compression tool 2 Slide rail 3 Slide member 3b Screw hole 4 Screw member 5 Press member 6 Guide member 7 Mounting member 7a Connecting frame 7b Leg frame 7c Mounting frame 8 Diesel engine (internal combustion engine)
10 Cylinder head 11 Valve 12 Valve spring

Claims (3)

A valve spring that presses and compresses the valve spring toward the cylinder head when the valve spring for urging the intake or exhaust valve is attached to or removed from the cylinder head of the internal combustion engine. A compression tool,
A linear slide rail extending along the longitudinal direction of the cylinder head;
A slide member slidably attached to the slide rail and having a screw hole extending toward the cylinder head;
A rod-like screw member screwed into the screw hole so as to be able to be screwed and screwed;
A pair of guide members for guiding each end of the slide rail so that the slide rail moves in a direction orthogonal to the slide rail and in a direction intersecting the screw member;
An attachment member for attaching the both guide members to the cylinder head,
On the cylinder head side of the screw member, the screw member is caused to correspond to the valve spring by the slide operation of the slide member and the guide operation of the slide rail in both guide members, and the cylinder head of the screw member A valve spring compression tool, comprising a pressing member that presses the valve spring toward the cylinder head by a screwing operation toward the side. The valve spring compression tool according to claim 1,
A pair of the slide rails are juxtaposed in the guide direction of the both guide members,
The valve spring compression tool, wherein the slide member bridges the slide rails, and the screw holes are formed to correspond to the slide rails. In the valve spring compression tool according to claim 1 or 2,
The attachment member is provided with a linear connection frame that connects the middle portions of the lower surfaces of the guide members, and a predetermined interval in the longitudinal direction of the connection frame, and extends in parallel toward the cylinder head. A pair of leg frames, and an attachment frame for connecting the extending ends of the leg frames and attaching to the cylinder head;
When the both guide members guide the slide rail to one side, the screw holes correspond to a space on one side of the connecting frame, while the both guide members guide the slide rail to the other side. A valve spring compression tool adapted to correspond to the space on the other side of the connecting frame.

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