Seville V8-252 4.1L (1982)
Fluid Filter - A/T: All Technical Service Bulletins
A/T - Delayed Engagement
Bulletin No. T 84-38A
File In Group
7
Number
97
Date
Mar. '84
SUBJECT:
DELAYED ENGAGEMENT - THM 325-4L
MODELS AFFECTED: 1982-1983 ELDORADO AND SEVILLE
This bulletin supersedes Serviceman Bulletin 84-38, Group 7, #93, which should be destroyed, and Section 1 of Serviceman Bulletin 82-59, Group 7,
#38.
Some 1982 and 1983 Cadillacs equipped with a THM 325-4L may experience a delayed transmission engagement when shifting from Park and/or
Neutral to Drive and/or Reverse upon initial start up after being parked for several hours. This condition may be caused by a loss of pump prime.
A revised service procedure, which includes the installation of a transmission pump intake check valve (P/N 8635971) and significantly reduces repair
time, has been developed to correct this condition.
FIGURE 1 - Installing Pump Intake Check Valve
Service Procedure
1.
Remove the transmission oil pan and filter as outlined in Section 7A of the appropriate Service Information Manual. Make sure that the filter to
case O-ring is also removed from the pump intake hole in the transmission case.
2.
Install a service part pump intake check valve (P/N 8639810) into the case pump intake hole (refer to Figure 1). This can be done by using a 1/2"
deep well socket and extension, or equivalent, as a driver. Be sure that the valve is fully seated and the valve stem undamaged after installation.
3.
Steps 1 and 2 should, in most cases, eliminate delayed engagement conditions. However, if the condition persists after following this procedure, it
may be necessary to proceed to step 4 and install service package P/N 8635967. This includes a #8-32 set screw to be used for plugging the line
bleed orifice in the case cover and a new design pressure regulator valve bushing. When installing this kit, it is essential to use both parts to ensure
proper transmission operation. It is not necessary to remove the check valve installed in step 2.
