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Home >> GMC >> 1999 >> C3500 HD 6.5 F, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Mechanical - 4.3L V6, 5.0L, 5.7L & 7.4L V8 - VINS [W,X,M,R,J]) >> Removal & Installation >> Oil Cooler Lines (4WD) >> Removal

Oil Cooler Lines (4WD): Removal

WARNING: This page is about a different variant/trim than selected.
  1. Remove the steering linkage shield.
    NOTE: Have a drain pan ready for the engine oil to drain into.
  2. Remove the bolt attaching the engine oil cooler lines to the remote (frame mounted) oil filter adapter. See Figure.
  3. Remove and discard the seals. See Figure.
  4. Remove the engine oil cooler line retaining rings from the engine oil cooler line quick connectors at the radiator engine oil cooler inlet and outlet. Follow the next 2 steps for the proper retaining ring removal procedure.
  5. Using a bent-tip screwdriver or equivalent, pull on one of the open ends of the retaining ring in order to rotate the retaining ring. See Figure.
  6. Rotate the retaining ring around the quick connector until the retaining ring is out of position and can be completely removed.
  7. Discard the retaining rings. Remove the engine oil cooler lines from the quick connectors at the radiator engine oil cooler inlet and outlet. Pull the lines straight out from the connectors. See Figure.
  8. Remove the remote engine oil filter lines support clamp bolt. See Figure.
  9. Remove the bolt attaching the remote engine oil filter lines to the remote (frame mounted) engine oil filter adapter. See Figure.
  10. Hold the remote engine oil filter lines below the remote engine oil filter lines (engine mounted) adapter to drain the engine oil.
  11. Remove and discard the seals. See Figure.
  12. Remove the bolt attaching the remote engine oil filter lines to the remote engine oil filter lines (engine mounted) adapter.
  13. Remove and discard the seals.
  14. Clean all of the components in a suitable solvent, and dry them with compressed air.
  15. Inspect the fittings, the connectors, the cooler lines, the cooler, the filter lines, and the remote filter adapter for damage, distortion, or restriction. Replace parts as necessary.
  16. Flush the engine oil cooler, the engine oil cooler lines, the remote engine oil filter adapter, and the remote engine oil filter lines with the same type of engine oil normally circulating through the engine.
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