Cummins/Onan FM-JFE2 — Tappet Adjustment
Adjustments · valve train
For the Cummins/Onan FM-JFE2, from the Cummins/Onan service manual.
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Procedure
- Loosen cap screw locking tappet lever to bearing.
- Push lever as far into crankcase as possible.
- Insert .008 inch feeler gauge between camshaft and face of cam follower.
- Pull lever back upward until gauge is squeezed lightly.
- Make adjustment on each cylinder when piston is at top dead center of compression stroke.
- Retighten cap screw securely.
Tools required
- .008 inch feeler gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Intake valve clearance .006 to .008 in
- Exhaust valve clearance .008 to .010 in
Source: Cummins/Onan 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.