Cummins/Onan 6.5NH - 3CR / 6000 A — Crankcase Breather (Flapper Valve) Cleaning
Maintenance
For the Cummins/Onan 6.5NH - 3CR / 6000 A, from the Cummins/Onan service manual.
Applies to: Cummins/Onan NH engine
Procedure
- Lift off the rubber breather cup.
- Carefully pry the valve from the cap, or press hard with both thumbs on top of the cap and fingers below to release the valve from the rubber cup.
- Wash the fabric flapper type check valve in a suitable solvent.
- Dry and install with the perforated disc toward the engine.
Tools required
- Solvent Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.