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b. Where leakage tends to run straight down, possible causes are a porous block, camshaft bore cup plugs, oil galley pipe plugs, oil filter runoff, and main bearing cap to cylinder block mating surfaces. See Engine, for 4. If no leaks are detected, pressurized the crankcase as outlined in the section, Inspection (Engine oil Leaks in general) CAUTION: Do not exceed 20.6 kPa (3 psi). 5. If the leak is not detected, very slowly turn the crankshaft and watch for leakage. If a leak is detected between the crankshaft and seal while slowly turning the crankshaft, it is possible the crankshaft seal surface is damaged. CAUTION: Use extreme caution when crankshaft polishing is necessary to remove minor nicks or 6. For bubbles that remain steady with shaft rotation, no further inspection can be done until disassembled. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING), under the Oil Leak row, for components inspections on possible 7. After the oil leak root cause and appropriate corrective action have been identified, (Refer to 9 - ENGINE/EN- GINE BLOCK/CRANKSHAFT OIL SEAL - REAR - REMOVAL). REMOVAL NOTE: This procedure can be performed in vehi- 1. If being performed in vehicle, remove the transmis- sion. 2. Remove the flexplate (Refer to 9 - ENGINE/EN- GINE BLOCK/FLEX PLATE - REMOVAL). NOTE: The crankshaft oil seal CAN NOT be reused NOTE: The crankshaft rear oil seal remover Spe- 3. Using Special Tool 8506 (1), remove the crankshaft rear oil seal (2). HB ENGINE - 5.7L SERVICE INFORMATION 9 - 1407 |