- Truck Engine:
- 3126E (S/N: 9SZ1-UP)
- 3126B (S/N: 8YL1-UP)
- C-10 (S/N: MBJ1-UP; 2PN1-UP; 3CS1-UP; 8YS1-UP)
- C-12 (S/N: CPD1-UP; TME1-UP; MBL1-UP; 9SM1-UP; 1YN1-UP; 2KS1-UP; 9NS1-UP)
- C13 (S/N: KCB1-UP)
After a hard injector seizure, replace the injector and the corresponding lifter assembly. A hard injector seizure occurs when the injector plunger fails on the down stroke. As the plunger seizes, separation occurs in the mechanism and the cup for the pushrod for the fuel injector disengages from the insert for the rocker arm. This crushes the pushrod between the rocker arm and the lifter assembly. As a result, the roller follower's pin becomes damaged. This damage is not visible.
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| Illustration 1 | g01278913 |
(A) 90 ± 10 degrees (1) Lifter body (2) Roller (3) Axle | |
If the cylinder head is removed for either a repair of a lifter or for any other reason, the positions of the arrows on the lifter rollers' axles on all six unit injector lifter assemblies need to be examined. If an arrow is more than ten degrees from vertical, replace the lifter assembly. The incorrect position of the arrow indicates that the roller's axle has begun to turn in the lifter body and the oil that is gathering on top of the axle is not correctly positioned. The roller's axle will not be lubricated properly. If the axle has turned into the lifter body the roller may eventually separate from the lifter body. This can cause damage to the cylinder block.
If the damage to the camshaft lobe is due to failures that are listed above, submit the Caterpillar warranty claim against the lifter.