Cummins/Onan — Clean crankcase breather
Maintenance
From a Cummins/Onan service manual covering: 10MJC, 15MJC, 3MJA, 4MJA, 5MJB, 705MJB. Check it applies to your exact model before use.
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Procedure
- Remove rubber cap from crankcase tube.
- Pry valve out of cap.
- Wash valve in fuel.
- Pull baffle out of breather tube and clean.
- Install valve with perforated disc toward engine.
Tools required
- pry tool 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.