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NOTE: If oil leakage is observed at the oil level indicator tube to block location; remove the tube, clean and T Stud & Bearing Mount (press fit tube applications only), and for O-ring style tubes, remove tube and replace the O-ring seal. INSPECTION FOR 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. If a leak is present in this area, remove transmission for further inspection. 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, oil gallery cup plug, bedplate to cylinder block mating surfaces and seal bore. See proper repair procedures for these items. 4. If no leaks are detected, pressurize the crankcase as previously described. 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 and 6. For bubbles that remain steady with shaft rotation, no further inspection can be done until disassembled. 7. After the oil leak root cause and appropriate corrective action have been identified, replace component(s) as necessary. STANDARD PROCEDURE REPAIR OF DAMAGED OR WORN THREADS Damaged or worn threads (excluding spark plug and camshaft bearing cap attaching threads) can be repaired. CAUTION: Be sure that the tapped holes maintain the original center line. Heli-Coil tools and inserts are readily available from automotive parts jobbers. HYDROSTATIC LOCKED ENGINE When an engine is suspected to be hydrostatically locked, regardless of what caused the problem, the following CAUTION: DO NOT use starter motor to rotate the engine, severe damage may occur. 1. Inspect air cleaner, induction system and intake manifold to insure system is dry and clear of foreign material. 2. Remove negative battery cable. 3. Place a shop towel around the spark plugs when removing them from the engine. This will catch any fluid that may possibly be in the cylinder under pressure. 4. With all spark plugs removed, rotate engine crankshaft using a breaker bar and socket. 5. Identify the fluid in the cylinder(s) (i.e., coolant, fuel, oil or other). 9 - 1908 ENGINE - 2.7L DOHC - SERVICE INFORMATION LX |