Cummins/Onan 5.5 NH / 6.5 NH — Breaker Points and Ignition Timing
Adjustments · ignition system
For the Cummins/Onan 5.5 NH / 6.5 NH, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan NH engine
Before you start
- Make ignition adjustments with the engine stopped and cold. Make sure feeler gauge is clean and free of grease, oil or dirt.
Procedure
- Remove cover by loosening screw and lift off.
- Turn the engine crankshaft (with rotation) until the maximum breaker point gap is obtained.
- Using an allen head wrench, adjust set screw for 0.020 inch (0.51 mm); measure gap with a flat thickness gauge.
- Replace point box cover.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Breaker point gap 0.020 inch (0.51 mm)
- Timing is set during initial engine assembly and is fixed by the point gap adjustment
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.