Cummins/Onan — Valve Clearance Check
Adjustments · Valve train
From a Cummins/Onan service manual — check it applies to your exact model before use.
Browse Cummins/Onan generators & specs →
Before you start
- Turn the engine clockwise only, and use the crankshaft bolt only.
Procedure
- Remove camshaft cover.
- Turn engine clockwise only using crankshaft bolt.
- Use feeler gauge to measure each valve clearance and record location.
- Intake: 0.22-0.28 mm (0.008-0.011 in.); Exhaust: 0.27-0.33 mm (0.010-0.013 in.).
- Measure clearances before removing camshafts.
- Select tappets using the formula and mark location.
Tools required
- Feeler gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Intake clearance 0.22-0.28 mm
- Exhaust clearance 0.27-0.33 mm
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.