Yanmar — Measuring and Adjusting Valve Clearance
Adjustments · Cylinder Head / Valve Train
From a Yanmar service manual covering: YDG2700, YDG2700EV-6EH, YDG2700EV-G6EH, YDG2700EV-GEH, YDG3700, YDG3700EV-6El, YDG3700EV-GEI, YDG5500, YDG5500EV-6El. Check it applies to your exact model before use.
Applies to: Yanmar YDG2700, Yanmar YDG2700EV-6EH, Yanmar YDG2700EV-G6EH, Yanmar YDG3700, Yanmar YDG5500, Yanmar L70V engine, Yanmar L100V engine, Yanmar L4sV L70V L100V engine
Procedure
- Remove the rocker arm (valve) cover bolts, valve cover and gasket.
- Rotate the crankshaft to piston TDC of the compression stroke.
- Check the valve clearance using a feeler gauge.
- Loosen the adjusting screw locknut.
- Turn the valve adjustment screw to adjust the clearance so there is slight drag on the feeler gauge.
- Hold the adjusting screw while tightening the locknut and recheck the clearance.
- Apply oil to the contact surface between the adjusting screw and push rod.
- Install a new rocker arm (valve) cover gasket.
- Install the rocker arm (valve) cover and bolts.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Standard Intake/Exhaust Valve Clearance 0.006 ± 0.002 in. (0.15 ± 0.05 mm)
Full service-parts list: Yanmar YDG2700EV-G6EH →
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.