Cummins/Onan 6.5NH - 3CR / 6000 A — Sisson Choke Adjustment
Adjustments
For the Cummins/Onan 6.5NH - 3CR / 6000 A, from the Cummins/Onan service manual.
Applies to: Cummins/Onan NH engine
Before you start
- Do not attempt adjustments until the engine has been shut down for at least one hour.
Procedure
- Shut the engine down for at least one hour; adjustment must be made at ambient temperature.
- Loosen the screw securing the choke actuating arm to the linkage.
- Shortening the actuating arm makes the fuel mixture richer; lengthening makes it leaner.
- Above 85 F the choke should be fully opened; below 25 F the choke should be opened 1/4 inch with the solenoid not engaged.
- Tighten the screw securing the choke actuating arm to the linkage.
Tools required
- Screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Above 85 F fully open
- Below 25 F opened 1/4 inch with solenoid not engaged
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.