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DIAGNOSIS AND TESTING - CLUTCH AIR Inoperative clutches can be located by substituting air pressure for fluid pressure. The clutches may be To make air pressure tests, proceed as follows: NOTE: The compressed air supply must be free of (1) Remove oil pan and valve body. (Refer to 21 - TRANSMISSION/AUTOMATIC - 42RLE/VALVE BODY - REMOVAL) (2) Apply air pressure to the holes in the special tool (1), one at a time. (3) Listen for the clutch to apply. It will give a slight thud sound. If a large amount of air is heard 2/4 CLUTCH Apply air pressure to the feed hole located on the 2/4 clutch retainer (2). Look in the area where the OVERDRIVE CLUTCH Apply air pressure to the overdrive clutch apply passage and watch for the push/pull piston to move REVERSE CLUTCH Apply air pressure to the reverse clutch apply pas- sage and watch for the push/pull piston to move rear- LOW/REVERSE CLUTCH Apply air pressure to the low/reverse clutch feed hole passage. Look in the area where the low/reverse UNDERDRIVE CLUTCH Because this clutch piston cannot be seen, its oper- ation is checked by function. Air pressure is applied DIAGNOSIS AND TESTING - FLUID LEAKAGE FLUID LEAKAGE - TORQUE CONVERTER HOUSING When diagnosing converter housing fluid leaks, three actions must be taken before repair: (1) Verify proper transmission fluid level. verter housing area and is transmission fluid. (3) Determine the true source of the leak. Fig. 9 Air Pressure Test Plate 1 - AIR PRESSURE TEST PLATES Fig. 10 Testing Underdrive Clutch 1 - AIR PRESSURE TEST PLATE 6599-1 21 - 50 AUTOMATIC TRANSMISSION - 42RLE TJ AUTOMATIC TRANSMISSION - 42RLE (Continued) |