Cummins/Onan 6.5NH - 3CR / 6000 A — Ignition Timing - Engine Running (Standard Pressure Cooled)
Adjustments · Ignition system
For the Cummins/Onan 6.5NH - 3CR / 6000 A, from the Cummins/Onan service manual.
Applies to: Cummins/Onan NH engine
Procedure
- Connect a timing light according to its manufacturer's instructions; either spark plug may be used as they fire simultaneously.
- Observe the timing mark through the flywheel fan.
- Start the engine and check that the flywheel mark lines up with the 22 degrees BTC mark on the cover.
- If adjustment is needed, loosen the mounting screws on the breaker box; move left to advance or right to retard.
- Restart the engine to be sure the mark lines up, then tighten all screws and replace the timing plug.
Tools required
- Timing light Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Timing 22 degrees BTC
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.