Cummins/Onan — Checking Valve Clearance
Adjustments · Valves
From a Cummins/Onan service manual covering: K1000, K1200, K1400, K1800, K2100, K2500, K3000, K3050, K3500, K400, K450, K800. Check it applies to your exact model before use.
Applies to: Cummins/Onan K1000, Cummins/Onan K450
Procedure
- Set piston at top dead center
- Measure clearance with feeler gauge
- If clearance is under reference value, grind valve stem to adjust
Tools required
- feeler gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Valve clearance varies by model
Full service-parts list: Cummins/Onan K1000 →, Cummins/Onan K450 →
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.