GB2279900A

GB2279900A - Cylinder head puller

Info

Publication number: GB2279900A
Application number: GB9312840A
Authority: GB
Inventors: Adrian Musgrove
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-06-22
Filing date: 1993-06-22
Publication date: 1995-01-18
Also published as: GB9312840D0

Abstract

The puller device comprises a flat plate of a strong material, such as steel, with a number of holes drilled through. A number of these holes are for securing the tool to the head casting by means of camshaft bearing cap studs with nuts attached. The remainder line up with the cylinder head studs. Through these holes forcing screws are fed which act upon the studs which are screwed into the engine block. These screws are tightened, applying a large force to the plate and, therefore, the cylinder head casting. Because of the difference in length of head castings, a separate tool is required for each side of the engine, as shown in Fig 1. and Fig. 2. Fig. 3. shows a shorter version which may be used on either cylinder head. <IMAGE>

Description

CYLINDER HEAD PULLER This invention relates specifically to the twelve cylinder Jaguar internal combustion engine.

Within the engine the securing studs for each cylinder head pass through the water jackets for the cylinder liners. With the passage of time and use of the engine, a large amount of silt accumulates between the cylinder head castings and the studs which pass through these castings. With sufficient accumulation of this silt the cylinder head castings become seized to the studs.

If it ever becomes necessary to remove a cylinder head casting from the engine block the task is often found to be very difficult, if not impossible. The maximum force that can be applied is limited by the weight of the engine or the weight of the vehicle. It is often the case that the vehicle is lifted from the ground without movement of the head casting relative to the engine block.

The tool is essentially as described herein; with reference to the accompanying diagrams. The main part of the tool is a plate, sufficiently robust to withstand the forces placed upon it.

Through the plate are holes, a total of twenty-four. Fourteen of these are of diameter approximately ten millimetres for through these holes pass the camshaft bearing cap studs. The holes are positioned to allow the aforementioned studs to pass through the plate without distortion to the studs. The the remaining ten holes are the screws which press on the cylinder head studs which remain fixed to the engine block.

The diagrams marked FIG. 1 and FIG. 2 show cut off front corners. This is to provide clearance for two tappet block studs. The other two cut out corners (marked a and b) are at the flywheel end of the engine. This feature provides clearance for the car structure and therefore enables the puller to be used whilst the engine is fitted to the car.

The accompanying diagrams will now be explained to describe an example of this invention.

FIG. 1 shows the left-hand tool.

FIG. 2 shows the right-hand tool.

FIG. 3 shows the interchangeable, shorter tool.

Referring to the diagrams FIG. 1 and 2, it is essential that the correct tool is used for the cylinder head casting to be removed.

The interchangeable tool may be used on either side of the engine, but as it only pulls on ten camshaft bearing studs, it is safer to use the appropriate handed tool.

In order to remove a stubborn cylinder head casting from the engine block the use of the tool is hereby described.

With all the ancillaries removed from that side of the engine the tool is brought towards the engine, in such a way that the camshaft bearing cap studs will pass through the holes drilled for them. The tool is them secured to the head casting by replacing the camshaft bearing cap nuts.

The tool is then brought to bear on the securing nuts. After ensuring that the force is borne evenly by all fourteen camshaft bearing cap studs the forcing screws are then tightened.

The reaction on the tool will serve to separate the cylinder head casting from the engine.

To take the weight of both the tool and the cylinder head casting a means of attaching a rope or chain may be provided.

Claims

1. A puller tool consisting of a plate of suitable material capable of withstanding the forces placed upon it, with a total of twenty-four holes through it; then of which are colinear with the cylinder head studs. The remainder are suitably positioned to allow the camshaft bearing cap studs to pass through.

2. A puller tool as claimed in Claim 1. wherein the holes for the camshaft bearing cap studs are so positioned to match the studs fixed to the left hand side cylinder head casting.

3. A puller tool as claimed in Claim 1. wherein the holes for the camshaft bearing cap studs are so positioned to match the right hand side cylinder casting.

4. A puller tool as claimed in Claims 1. and 2. which has a rear corner cut out.

5. A puller tool as claimed on Claims 1. and 3. which has rear corner cut out.

6. A puller tool as claimed in Claims 1. and 2. which has the front corners cut off diagonally.

7. A puller tool as claimed in Claims 1. and 3. which has the front corners cut off diagonally.

8. A puller tool consisting of a plate of suitable material capable of withstanding the forces placed upon it, with a total of twenty holes drilled through it; 10 of which are colinear with the cylinder head studs. The remainder are suitably positioned to allow the camshaft bearing cap studs to pass through.

9. A puller tool as claimed in Claims 1. and 8. wherein means to attach a rope or chain are provided.

10. A puller tool as claimed in any of the preceding claims wherein forcing screws pass through the holes coline,ar with the cylinder head bolts.

11. A puller tool as described herein and with reference to the accompanying drawings.