Perkins — To set number 1 piston to TDC on the compression stroke (Operation 8-1)

Adjustments · Engine timing

From a Perkins service manual — check it applies to your exact model before use.

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Procedure

1. Fasten a temporary pointer to the timing case cover near the pulley/damper edge
2. Loosen the gland nuts that retain the atomisers; remove the rocker cover
3. Rotate crankshaft clockwise from the front until the push rod for the inlet valve of the rear cylinder just tightens
4. Remove front rocker lever and front valve spring; allow valve to be held by the top of the piston
5. Fit dial test indicator on top of the valve stem; rotate crankshaft and mark the pulley at the two pointer stop positions
6. Mark the centre point between the two marks
7. Refit spring, rocker lever and circlip; adjust valve tip clearance
8. Rotate crankshaft approximately 45° counter-clockwise then clockwise until the mark aligns with the pointer

Source: Perkins service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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