Perkins — Valve tip clearances - to check and to adjust

Adjustments · Valves and rocker assembly

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

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Procedure

1. With the engine cold, inlet clearance is 0,20 mm (0.008 in) and exhaust 0,45 mm (0.018 in).
2. Four cylinder: turn the crankshaft until the inlet valve of number 4 cylinder has just opened and the exhaust valve has not fully closed.
3. Check and adjust the clearances of number 1 cylinder valves.
4. With number 2 cylinder set, check/adjust number 3; with number 1 set, check/adjust number 4; with number 3 set, check/adjust number 2.
5. Six cylinder: turn the crankshaft until number 6 inlet has just opened and number 6 exhaust has not fully closed.
6. Check and adjust number 1 cylinder; then with 2 set check 5; with 4 set check 3; with 1 set check 6; with 5 set check 2; with 3 set check 4.

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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