Cummins/Onan — Piston Ring Installation
Repair & overhaul · piston rings
From a Cummins/Onan service manual covering: 205D3A, 3DJA, 3DJA-1E2236, 3DJA-3E2236. Check it applies to your exact model before use.
Applies to: Cummins/Onan DJA engine
Procedure
- Install rings with mark toward closed end of piston.
- Space ring gaps one fourth around piston; no gap in line with piston pin.
- Oil rings and piston.
- Gap in oil ring expander approximately 180 degrees from gap in oil ring.
Tools required
- ring expander 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.