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(3) Remove torque converter or clutch housing cover and inspect rear of block for evidence of oil. (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 case 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 CAUTION: Use extreme caution when crankshaft (6) For bubbles that remain steady with shaft rotation, no further inspection can be done until dis- (7) After the oil leak root cause and appropriate corrective action have been identified, replace compo- CYLINDER COMPRESSION PRESSURE TEST The results of a cylinder compression pressure test can be utilized to diagnose several engine malfunc- Ensure the battery is completely charged and the engine starter motor is in good operating condition. (1) Check engine oil level and add oil if necessary. operating temperature. Select a route free from traf- (3) Remove all spark plugs from engine. As spark plugs are being removed, check electrodes for abnor- (4) Remove the Auto Shutdown (ASD) relay from the PDC. (5) Be sure throttle blade is fully open during the compression check. (6) Insert compression gauge adaptor Special Tool 8116 or the equivalent, into the #1 spark plug hole in t. For Special Tool identification, (Refer to 9 - ENGINE - SPECIAL TOOLS). (7) Crank engine until maximum pressure is reached on gauge. Record this pressure as #1 cylin- (8) Repeat the previous step for all remaining cyl- inders. (9) Compression should not be less than 689 kPa (100 psi) and not vary more than 25 percent from cyl- (10) If one or more cylinders have abnormally low compression pressures, repeat the compression test. (11) If the same cylinder or cylinders repeat an abnormally low reading on the second compression CYLINDER COMBUSTION PRESSURE LEAKAGE The combustion pressure leakage test provides an accurate means for determining engine condition. Combustion pressure leakage testing will detect: ing). • Leaks between adjacent cylinders or into water jacket. • Any causes for combustion/compression pressure loss. WARNING: DO NOT REMOVE THE PRESSURE CAP Check the coolant level and fill as required. DO NOT install the pressure cap. Start and operate the engine until it attains nor- mal operating temperature, then turn the engine Clean spark plug recesses with compressed air. RS ENGINE 2.4L 9 - 9 ENGINE 2.4L (Continued) |