Yanmar — Inspection and Adjustment of Valve Clearance
Adjustments
From a Yanmar service manual — check it applies to your exact model before use.
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Before you start
- Adjust only when engine is cold
Procedure
- Check and adjust the valve clearance when the engine is cooled down.
- Remove the bonnet.
- Turn crankshaft pulley clockwise to set No.1 cylinder at compression top position.
- Check that intake and exhaust valve rocker arms do not move when crankshaft turned about 90 deg both directions.
- Check only the valves indicated in the illustration using a feeler gauge and record the clearance.
- Turn the crankshaft pulley once (360 degrees) and locate the mark.
- Check only the valves indicated in the illustration and record the clearance.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 6LP-DTE FridayParts $152.00 intake 0.15 to 0.25 mm, exhaust 0.35 to 0.45 mm
- 6LP-STE FridayParts $152.00 intake 0.17 to 0.23 mm, exhaust 0.47 to 0.53 mm
Source: Yanmar 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.