Cummins/Onan — PT (type D) Injector - Adjustment
Adjustments
From a Cummins/Onan owner's manual covering: K1800, K2000E, K38, K50, KT38, KTA38, KTA50, KTTA38, KTTA50, KtA38, KtA50, KttA38. Check it applies to your exact model before use.
Applies to: Cummins/Onan K38, Cummins/Onan K50, Cummins/Onan KTA38, Cummins/Onan KTA50, Cummins/Onan K38 and K50 engine
Before you start
- The injector plunger is under spring tension. Do NOT allow the tool to slip.
- Prevent damage to the indicator by allowing the lever to return slowly.
Procedure
- Assemble the parts of an injector and valve adjustment kit, Part No. 3822575, or equivalent, and install it on the cylinder.
- Adjust the indicator so the tip touches the top of the injector plunger.
- Lower the indicator 12.25 mm [0.5 inch] to allow for travel. Lock the indicator support to the post.
- Use a rocker lever actuator, Part No. 3822574, or equivalent. Depress the lever until the injector bottoms two or three times.
- Hold the lever with the injector plunger firmly bottomed and set the indicator to ZERO.
- Turn the adjusting screw until the indicator reads the specified travel.
- Tighten the locknut to the torque value.
- Check the injector adjustment and repeat if not within specification.
Tools required
- 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
- PT (type D) injector travel: 7.82 mm [0.308 in]
- Injector travel verification: 7.80 MIN [0.307] / 7.82 MAX [0.308] mm
- Locknut torque with adapter: 45 Nm [35 ft-lb]; without adapter: 60 Nm [45 ft-lb]
Full service-parts list: Cummins/Onan K38 →, Cummins/Onan K50 →, 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.