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CONVERTER DRAINBACK CHECK VALVE The converter drainback check valve is located in the cooler outlet (pressure) line near the radiator The valve is serviced as an assembly; it is not repairable. Do not clean the valve if restricted, or and metal shavings, the valve must be replaced. The valve must be removed whenever the cooler and lines are reverse flushed. The valve can be flow If the valve is restricted, installed backwards, or in the wrong line, it will cause an overheating condition CAUTION: The drainback valve is a one-way flow OIL PUMP VOLUME CHECK Measuring the oil pump output volume will deter- mine if sufficient oil flow to the transmission oil Verify that the transmission fluid is at the proper level. Refer to the Fluid Level Check procedure in t ATF+3, type 7176, Auto- matic Transmission Fluid. (1) Disconnect the To cooler line at the cooler inlet and place a collecting container under the dis- CAUTION: With the fluid set at the proper level, (2) Run the engine at curb idle speed, with the shift selector in neutral. (3) If one quart of transmission fluid is collected in the container in 20 seconds or less, oil pump flow vol- ume is within acceptable limits. If fluid flow is inter- (4) Re-connect the To cooler line to the transmis- sion cooler inlet. (5) Refill the transmission to proper level. FLUSHING COOLERS AND TUBES When a transmission failure has contaminated the fluid, the oil cooler(s) must be flushed. The torque The only recommended procedure for flushing cool- ers and lines is to use Tool 6906A Cooler Flusher. WARNING: WEAR PROTECTIVE EYEWEAR THAT KEEP LIGHTED CIGARETTES, SPARKS, FLAMES, AND OTHER IGNITION SOURCES AWAY FROM THE IN THE AREA WHERE THE FLUSHER WILL BE USED. KEEP THE AREA WELL VENTILATED. TACT WITH YOUR EYES OR SKIN: IF EYE CONTAM- COOLER FLUSH USING TOOL 6906A (1) Remove cover plate filler plug on Tool 6906A. Fill reservoir 1/2 to 3/4 full of fresh flushing solution. (2) Reinstall filler plug on Tool 6906A. nect red alligator clip to positive (+) battery post. (4) Disconnect the cooler lines at the transmission. NOTE: When flushing transmission cooler and lines, ALWAYS reverse flush. 21 - 74 42RE AUTOMATIC TRANSMISSION WJ SERVICE PROCEDURES (Continued) |