A/T - Delayed Engagement/No Drive/Reverse After Start Up

87chrysler3

Models


1986 Domestic Front Wheel Drive With Automatic Transaxle


Subject


Delayed Engagement, No Drive, or Reverse After Start Up


Index


TRANSMISSION

Date


May 19, 1986

No.


21-08-86

P-1931
SYMPTON/CONDITION

After starting the vehicle, there is no drive or reverse for an abnormally long period of time (5 seconds or longer), or until shifting gears, or until the engine is raced. This condition is most likely to occur after a hot soak of approximately one hours. It may also occur after an overnight soak. It is not always repeatable.

DIAGNOSIS

Test the transaxle for engagement into drive and/or reverse after a hot soak. If there is no engagement for an abnormally long period of time (5 seconds or longer), or until shifting gears or until the engine is raced, and if subsequent operation is normal, do the following repair.

REPAIR PROCEDURE

The above condition(s) can be caused by excessive front pump rotor clearance. Replacement of the front pump is necessary to correct this condition.

1. Remove the transaxle per the appropriate 1986 service manual instruction.

2. Remove the front pump assembly and check the rotor side clearance.

NOTE: THE MOST ACCURATE METHOD TO CHECK ROTOR CLEARANCE IS BY USING THE PLASTI-GAUGE METHOD AS FOLLOWS:

a. Remove reaction shaft support from front pump housing.



b. Clean all oil from the housing, reaction shaft support, and rotor. (Oil will cause the plasti-gauge to dissolve.) Place plasti-gauge on the inner and outer rotor as shown in Figure 1.
c. Reassemble the pump with at least three bolts, being careful not to twist the components and smear the plasti-gauge.

d. Again, carefully remove the reaction shaft support.

e. Using the scale on the plasti-gauge package, measure the clearance. The clearance should be .0008" to .0038".

Replace the pump assembly if the clearance is above these limits.

NOTE: THE NEW PUMP MUST BE CHECKED FOR PROPER CLEARANCE PRIOR TO INSTALLATION. IF CLEARANCES ARE ABOVE THE LIMITS, DON'T USE THE PUMP.

If plasti-gauge is not available, then the straight edge method as described in the service manual may be used to check the rotor clearance:

a. Remove the reaction shaft from the pump assembly.

b. Place a straight edge on the pump face.

Measure the rotor clearance on both rotors. The clearance, when measured by this method, is .0008" to .0018". If clearance is above these limits, replace the pump assembly.

3. Install a checked front pump assembly using new gaskets. Torque the bolts to 275 inch pounds.

4. Reinstall transaxle and refill to proper level with Mopar-type 7176 Automatic Transmission Fluid, PN 4318007.

5. Road test the vehicle and check transaxle operation.


POLICY: Reimbursable within the provisions of the warranty

TIME ALLOWANCE:
Labor Operaton No. 21-60-05-90 - Omni, Horizon 3.8 Hrs.
All Other 3.4 Hrs.

FAILURE CODE: 8E - Front Pump Failed