Cummins/Onan — Permanent Engine Storage
Maintenance
From a Cummins/Onan operator's manual covering: G-1710, G-495, G-743, G-855, GTA-1710, GTA-743, GTA-855. Check it applies to your exact model before use.
Applies to: Cummins/Onan G-855
Before you start
- Engines in storage more than 24 months should be flushed and reprocessed with rust preventative materials.
Procedure
- Start engine, increase to 1200 RPM no load until thoroughly warm; stop and drain oil.
- Fill crankcase to full mark with preservative oil MIL-L-21260 Type P-10 Grade 2 SAE 30.
- Operate 5 to 10 minutes on preservative oil; stop engine.
- Remove spark plugs; pour 3 to 4 oz oil in each cylinder; install plugs and turn engine over 30 seconds.
- Drain all oil sumps of pumps, compressors, coolers, filters and crankcase; replace plugs.
- Spray intake and exhaust ports with preservative oil; replace manifolds.
- Loosen V-belt tension.
- Cover all engine openings with heavy paper and tape; tag engine.
Source: Cummins/Onan operator's 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.