A/T - THM 325-4L Delayed Engagement

Bulletin No. T 84-38
File In Group 7
Number 93
Date Jan. '84
SUBJECT: DELAYED TRANSMISSION ENGAGEMENT - THM 325-4L

MODELS AFFECTED: 1982-1983 ELDORADO, SEVILLE

FIGURE 1 - CASE COVER PLATE:

Some 1982 and 1983 Cadillacs equipped with a THM 325-4L transmission may experience a delayed engagement when shifting from Park to Drive or Reverse after being parked for several hours. This condition may be caused by a loss of pump prime. A filter containing a one-way check valve (service package P/N 8635927) was released in April of 1982 to correct this condition on 1982 models (refer to Serviceman Bulletin #82-59). If this condition exists on 1983 models, or on 1982 models after installing the service package, replacement of the pressure regulator bushing and plugging the line bleed orifice hole in the case cover (refer to Figure 1) may be required.
Refer to the listed parts and service information for performing this repair.

Parts Information

Service Package 8635967

1 - pressure regulator bushing 1 - #8-32 set screw 1 - instruction sheet

Service Procedure

1. Remove transmission from vehicle and disassemble the case cover as listed in the appropriate Service Information Manual.

2. Press the drive sprocket support out of the case cover (refer to SIM Section 325-4L, Figure Nos. 153 and 157).

NOTE: The case cover must be supported as outlined in the Service Information Manual to prevent cracking the cover.

FIGURE 1 - CASE COVER PLATE:

3. Remove the line bleed orifice cup plug from either side with a 1/8" punch (refer to Figure 1).

FIGURE 2 - CASE COVER PLATE:

4. Tap the line bleed orifice hole using, a #8-32 tap. Run the tap into the hole from the sprocket support side approximately halfway through; do not tap the hole all the way through (refer to Figure 2).
5. Coat the set screw with Loctite and install into the case cover with a 5/64" allen wrench until snug.

6. Remove the pressure regulator bushing from the case and install the new bushing.

For warranty purposes, use labor Operation No. T6088 for 5.2 hours.