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REPAIR DAMAGED OR WORN THREADS CAUTION: Be sure that the tapped holes maintain Damaged or worn threads can be repaired. Essen- tially, this repair consists of: • Drilling out worn or damaged threads. • Tapping the hole with a special Heli-Coil Tap, or equivalent. • Installing an insert into the tapped hole to bring the hole back to its original thread size. SERVICE ENGINE ASSEMBLY (SHORT BLOCK) A service replacement engine assembly (short block) may be installed whenever the original cylin- A short block is identified with the letter “S” stamped on the same machined surface where the Installation includes the transfer of components from the defective or damaged original engine. Fol- HYDROSTATIC LOCK When an engine is suspected of hydrostatic lock (regardless of what caused the problem), follow the (1) Perform the Fuel Pressure Release Procedure (refer to Group 14, Fuel System). (2) Disconnect the negative cable from the battery. air cleaner, induction system and intake manifold to ensure system is dry and clear of (4) Place a shop towel around the spark plugs to catch any fluid that may possibly be under pressure CAUTION: DO NOT use the starter motor to rotate (5) With all spark plugs removed, rotate the crank- shaft using a breaker bar and socket. (6) Identify the fluid in the cylinders (i.e. coolant, fuel, oil, etc.). (7) Make sure all fluid has been removed from the cylinders. (8) Repair engine or components as necessary to prevent this problem from occurring again. (9) Squirt engine oil into the cylinders to lubricate the walls. This will prevent damage on restart. (10) Install new spark plugs. Tighten the spark plugs to 37 N·m (27 ft. lbs.) torque. (11) Drain engine oil. Remove and discard the oil filter. (12) Install the drain plug. Tighten the plug to 34 N·m (25 ft. lbs.) torque. (13) Install a new oil filter. engine crankcase with the specified amount and grade of oil (refer to Group 0, Lubrica- (15) Connect the negative cable to the battery. ENGINE OIL SERVICE WARNING: NEW OR USED ENGINE OIL CAN BE ENGINE OIL SPECIFICATION CAUTION: Do not use non-detergent or straight API SERVICE GRADE CERTIFIED Use an engine oil that is API Service Grade Certi- fied. MOPAR provides engine oils that conform to the Standard engine oil identification notations have been adopted to aid in the proper selection of engine Fig. 39 Engine Oil Container Standard Notations 9 - 88 4.0L ENGINE XJ SERVICE PROCEDURES (Continued) |