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Home›Repair guides›Cummins/Onan›Starting the Power Unit

Cummins/Onan W3M-19 — Starting the Power Unit

Operation

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

  • Do not spin or push down on the crank
  • Do not overchoke

Procedure

  1. See that circuit breaker is in OFF position.
  2. Pull out choke button as required by temperature; do not overchoke.
  3. Remove starting crank and insert through hole below radiator.
  4. Be sure crank engages positively with crankshaft ratchet.
  5. Crank with a strong, quick, upward pull.
  6. When engine starts, push choke button part way in.
  7. Gradually push choke button entirely in as engine warms up.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Impulse coupling snap heard below 200 r.p.m.
  • Oil pressure about 15 pounds

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.

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