Cummins/Onan — Valves and Injectors - General Checking and Adjustment
Adjustments · valve train
From a Cummins/Onan owner's manual covering: K1800, K2000E, K38, K50, KT38, KTA 50 G3, KTA-50G3, KTTA50, KtA38, KtA50, KttA38. Check it applies to your exact model before use.
Applies to: Cummins/Onan K38, Cummins/Onan K50, Cummins/Onan KTA-50G3, Cummins/Onan KTA38, Cummins/Onan KTA50
Before you start
- Use the correct chart for the engine or the parts will be damaged.
- Crosshead adjustment must always be made before adjusting the valves.
Procedure
- Steam clean engine before removing rocker lever covers.
- Remove rocker lever covers and related components.
- Align valve set (VS) mark on damper or flywheel with pointer.
- Determine cylinder in position; crossheads and valves ready when all valves closed.
- Adjust crossheads before adjusting valves.
- Adjust valves to lash specification with feeler gauge.
- Adjust injectors per PT (type D) or STC/HVT method.
- Tighten locknuts and reinstall rocker lever covers.
Tools required
- 3376592 inch pound torque wrench Amazon
- 3822575 injector and valve adjustment kit Amazon
- 3822574 rocker lever actuator Amazon
- ST-669 torque wrench adapter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Intake 0.36 mm [0.014 in]
- Exhaust 0.69 mm [0.027 in]
- Injector locknut 45 Nm with adapter / 60 Nm without
Full service-parts list: Cummins/Onan K38 →, Cummins/Onan K50 →, Cummins/Onan KTA-50G3 →, Cummins/Onan KTA38 →, Cummins/Onan KTA50 →
Source: Cummins/Onan owner'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.