Kohler — Adjusting Valve Clearance
Adjustments · Cylinder head valves
From a Kohler service manual covering: 4CFKM, 4CKM, 5CKM, 5CKM/SCKMR, ACKM/4CKMR. Check it applies to your exact model before use.
Applies to: Kohler 4CFKM, Kohler 4CKM, Kohler 5CKM, Kohler M18 engine, Kohler M20 engine
Procedure
- Stop and cool engine to ambient temperature.
- Rotate flywheel and observe valve movement to find cylinder at TDC.
- Measure valve-to-tappet clearance with flat feeler gauge.
- Rotate flywheel 360 degrees; measure remaining cylinder.
- Grind valve stems if clearance insufficient; replace valves if excessive.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Intake 0.003-0.006 in. (0.076-0.152 mm)
- Exhaust 0.011-0 FridayParts $71.26.014 in. (0.279-0.355 mm)
Full service-parts list: Kohler 4CFKM →, Kohler 4CKM →, Kohler 5CKM →
Source: Kohler 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.