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CHECKING ENGINE OIL PRESSURE 1. Remove oil pressure sending unit (2) and install gauge assembly C-3292. 2. Run engine until thermostat opens. 3. Oil Pressure: • Curb Idle - 25 kPa (4 psi) minimum • 3000 rpm - 170 - 758 kPa (25 - 110 psi) 4. If oil pressure is 0 at idle, shut off engine. Check for a clogged oil pick-up screen or a pressure relief REAR SEAL AREA LEAKS Since it is sometimes difficult to determine the source of an oil leak in the rear seal area of the engine, a more If the leakage occurs at the crankshaft rear oil seal area: 1. Disconnect the battery. 2. Raise the vehicle. 3. Remove torque converter or clutch housing cover and inspect rear of block for evidence of oil. Use a black light to check for the oil leak: a. Circular spray pattern generally indicates seal leakage or crankshaft damage. 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, 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). 9 - 850 ENGINE - 3.7L SERVICE INFORMATION ND |