Cummins/Onan W3M-19 — Preparing the Power Unit for Storage
Maintenance
For the Cummins/Onan W3M-19, from the Cummins/Onan service manual.
Applies to: Cummins/Onan W3M-19, Cummins/Onan W2C engine
Before you start
- Plug exhaust outlet with a wood plug to prevent entrance of moisture or small animals
Procedure
- Drain fuel from tank and filter bowl, then run engine until it stops.
- Drain all oil from oil base while engine is warm, replace drain plug.
- Drain cooling system, leave caps on fuel tank, radiator and oil filler.
- Remove spark plugs, pour two tablespoonfuls OE-30 oil in each cylinder, crank several revolutions, replace plugs with gaskets.
- Clean generator brushes, holders, commutator and slip rings with clean cloth; do not coat with grease.
- Disassemble and clean air cleaner, dip element in OE-30 oil, reassemble without oil in cup.
- Wipe exposed parts and coat those liable to rust with a film of grease.
- Oil throttle control link joints with OE-50 oil, plug exhaust outlet, install side panels and canvas cover.
Tools required
- Hand crank Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Two tablespoonfuls OE-30 oil per cylinder
Full service-parts list: Cummins/Onan W3M-19 →
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.