Pages 17-09-11, 17-09-12, 17-09-13 & 17-09-14
1989
17-09-11 E40D Automatic Transmission 17-09-11
DIAGNOSIS AND TESTING (Continued)
4. Lift the tool upward as far as it will go and note the indicator reading. The indicator reading is the total end play which the turbine and stator share. Replace the converter unit if the total end play exceeds the limits. End play specifications are listed below.
5. Loosen the threaded inner post to free the tool,and then remove the tool from the converter.
Torque Converter One-Way Clutch Inspection In order to test the converter one-way clutch, insert fingers into the torque converter. Reaching the first splined segment, attempt to spin it. The segment should rotate freely clockwise and should not turn counterclockwise without the converter turning with
it. If the segment rotates freely counterclockwise or does not rotate freely clockwise, the one-way clutch has failed and the torque converter should be replaced.
Stator to Impeller Interference Check
1. Position the stator support on a bench with the spline end of the shaft pointing up.
2. Mount a converter on the stator support with the splines on the one-way clutch inner race engaging the mating splines of the stator support.
3. Hold the stator support stationary and try to rotate the converter counterclockwise. The converter should rotate freely without any signs of interference or scraping within the converter assembly.
4. If there is an indication of scraping, the trailing edges of the stator blades may be interfering with the leading edges of the impeller blades. In such cases, replace the converter.
NOTE: Stator support may remain in pump assembly during this test.
1989
17-09-12 E40D Automatic Transmission 17-09-12
DIAGNOSIS AND TESTING (Continued)
Stator to Turbine Interference Check
1. Position the converter on the bench front side down.
2. Install a stator support to engage the mating splines of the stator support shaft.
3. Install the input shaft, engaging the splines with the turbine hub.
4. Hold the stator shaft stationary and attempt to rotate the turbine with the input shaft. The turbine should rotate freely in both directions without any signs of interference or scraping noise.
5. If interference exists, the stator front thrust washer may be worn, allowing the stator to hit the turbine. In such cases, the converter must be replaced.
Check the converter crankshaft pilot for nicks or damaged surfaces that could cause interference when installing the converter into the crankshaft. Check the converter impeller hub for nicks or sharp edges that would damage the pump seal.
NOTE: Stator support may remain in pump assembly during this test.
Line Pressure Test
1. Connect pressure gauge to line pressure tap.
Line Pressure Tap
17-09-13 1989 E40D Automatic Transmission 17-09-13
DIAGNOSIS AND TESTING (Continued)
2. Start engine and check line pressures. Refer to the following chart to determine if line pressure is within specification. Line Pressure Specifications
3. If line pressure is not within specification, perform air pressure checks and service main control system.
Line Pressure Test Chart
1989
17-09-14 E40D Automatic Transmission 17-09-14
DIAGNOSIS AND TESTING (Continued)
Stall Test
The stall test checks the operation of the following items:
^ Converter one-way clutch
^ Forward clutch
^ Low/Reverse one-way clutch
^ Reverse clutch
^ Overdrive one-way clutch
^ Direct clutch
^ Coast clutch
^ Engine performance
NOTE: The stall test should only be performed with the engine and transmission at normal operating temperatures.
WARNING: APPLY THE SERVICE AND PARKING BRAKES FIRMLY WHILE PERFORMING EACH STALL TEST.
1. Connect tachometer to engine.
2. After testing each of the following ranges (D),2, 1 and R, move selector lever to N (NEUTRAL) and run engine for about 15 seconds to allow converter to cool before testing next range.
CAUTION: Do not maintain WOT in any gear range for more than five seconds.
Press accelerator pedal to floor (WOT) in each range. Record rpm reached in each range. Stall speeds should be in appropriate range:
Engine Stall Speed (rpm)
5.8L 2100-2460
7.3L-D 1650-1910
7.5L 1840-2155
CAUTION: If engine rpm recorded by the tachometer exceeds maximum specified rpm, release accelerator pedal immediately. Clutch or band slippage is indicated.
If the stall speeds were too high, refer to the following Stall Speed Diagnosis Chart. If the stall speeds were too low, first check engine tune-up. If engine is OK, remove torque converter and check torque converter reactor one-way clutch for slippage.
Stall Speed High (Slip)
Transmission Fluid Cooler Flow Test
NOTE: The transmission linkage adjustment, fluid level, and line pressure must be within specification before performing this test. Refer to service procedures in this Section.
1. Remove dipstick from filler tube.
2. Place funnel in filler tube.
3. Raise vehicle. Refer to Pre-Delivery manual, Section 50-04.
4. Remove cooler return line (rear fitting) from fitting on transmission case.