Camshaft Timing

This is a ressonably time consuming and 'technical' process, so please do not attempt it unless you are comfortable with all of the procedures

You will need the following pieces of equipment and tools:

A Dial test indicator (DTI) with an adjustable length shaft.
Dial Test Indicator

A protractor wheel with a hole in the center.

A pointer to attach to the block.

A cylinder dead stop (if you are timing the camshaft with the heads off).

A 15/16" Open Ended Spanner

The first task is to set "Top Dead Center" (TDC) on the engine. This is the point at which #1 piston is at the top of its travel up and down the cylinder bore. Because the piston has a slight 'dwell' at its highest point ... it is important to find TDC very accurately as it will have a huge effect on the rest of the camshaft timing process if it is wrong. Fit the crankshaft cam sprocket to the crankshaft and locate on the keyway. Fit the protractor to the crankshaft pulley and fit the pointer to the front cover bolt hole as shown above. The dead stop shown above is bolted accross the cylinder face of the block and the central bolt adjusted so that it is clear of the piston crown, allowing the engine to be fully rotated. Turn the engine until the piston appears to be at the top of its travel .... then rotate the engine aproximately 20 degrees anti clockwise. Now carefully adjust the central bolt of the dead stop until it touches the piston. Rotate the protractor until TDC is aligned with the pointer. Now rotate the engine slowly anti clockwise until the piston comes beack up the bore and again touches the dead stop bolt. Note the angle of the protractor.

Whatever the value of this protracor reading (in the picture 30 degrees), halve that value (in this case 15 degrees) and adjust the protractor to align 15 degrees with the pointer. Now rotate the engine clockwise until the central bolt again touches the piston. Check the protractor, the value should now be 15 degrees on the other side of TDC. If it is, you have set TDC. If it is not ... adjust the bolt slightly looser ... and repeat the process until you have an equal number of degrees either side of the TDC mark on the protractor (without moving the central bolt). Once you are happy that it is set, DO NOT MOVE THE POTRACTOR! until you have finished setting the camsaft timing.

The next step is to fit the DTi to the block face and align its pointer with the top of #1 inlet valve's camshaft follower. Fit a follower to the gallery above #1 inlet valve, then align the dti, checking that it is central and does not 'ride up' the follwer dish as the pointers arm moves.

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