Duramax LLY – FRONT COVER AND OIL FILLER TUBE

Inspect the cover for cracks, scratches/nicks on the sealing surfaces, or damaged threads. Remove minor scratches/nicks with 180 grit emery. Repair thread damage with helicoil inserts. Replace part if damaged (Figure 2-129). Inspect the adapter plate for cracks, scratches on mating and sealing surfaces, dents, pitting, and corrosion. Repair minor scratches with 180 grit emery. Replace the plate if cracked or bent.

Inspect the oil filler tube grommet. Replace the grommet if cracked, brittle, or loose (Figure 2-130).
Inspect the oil filler tube. Replace the tube if cracked or distorted (Figure 2-131).
Inspect the filler cap sealing gasket. Replace the cap if the gasket is missing or damaged. Replace the cap if damaged.

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