Cummins/Onan 6.5NH - 3CR / 6000 A — Oil Pressure Relief Valve Adjustment
Adjustments
For the Cummins/Onan 6.5NH - 3CR / 6000 A, from the Cummins/Onan service manual.
Applies to: Cummins/Onan NH engine
Procedure
- Loosen the locknut on the slotted stud near the breather tube.
- Turn the stud inward to increase oil pressure or outward to decrease oil pressure.
- Tighten the locknut securely after the adjustment.
- The spring and plunger may be removed and cleaned.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Oil pressure 30-35 FridayParts $14.81 KuduParts $233.00 lbs when thoroughly warmed up
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.