TRANS OIL LEAKS 325-4L NEW SPROCKET COVER

MODELS AFFECTED: 1982-1983 ELDORADO AND SEVILLE

Between September, 1982 and September, 1983, various changes have been made to the 325-4L transmission to alleviate oil leaks in the area of the oil pan and sprocket cover. The foHowing is a summary of those changes by year, model and I.D. number.

1. 1982 units built after model and I.D. numbers AJ4846 and AL4609 incorporate a change in the number of bolt holes at the sprocket cover flange. Two additional bolt holes were added (refer to Figure 1).

2. 1983 units built after model and I.D. number AJ78580 and AL2837 use a new type oil pan, bolt and gasket. The new oil pan is thicker and has a raised continuous rib on the flange (refer to Figure 2). The bolts are a hex head screw and conical washer assembly (refer to Figure 3). The new gasket is thicker than previous designs.

3. Units built after model and I.D. number AJ3907 and AL1020 use a metal sprocket cover with a raised continuous rib on the flange (refer to Figure 2). Hex head screw conical washer bolt assemblies are also used along with a thick cork gasket.

When servicing 1982-1983 Eldorados and Sevilles equipped with THM 325-4L for oil leaks in these areas, it is recommended you use the listed service procedures and parts information.

Service Procedures

1. Refer to Section 7A of the 1984 Service Information Manual for the proper removal and installation procedures for the affected parts.

2. Visually inspect (A) the pan or cover and (B) the bolts to determine if the new parts have been used.

3. Assure that all new service parts are used. If new parts have been used, you should need only the new gasket.

NOTICE: A. Do not use RTV with the new type oil pan or sprocket cover.

B. Do not overtorque bolts when reassembling, split or cracked gaskets may result. Oil pan bolts should be torqued to 11 N.m (8 ft. lbs.). Sprocket cover bolts to 13 N.m (9 ft. lbs.) maximum.

C. When servicing a transmission of the earlier case design, it will be necessary to drill and tap the case to accommodate the new hole in the #1 position only. Do not drill the case in the #2 position, the area behind the case flange is a high pressure passage. If drilled too deep, case leaks may result. For case modification procedures, refer to the following steps:

1. Place the new steel sprocket cover onto the case and align the bolt holes.

2. Mark the location of the #1 hole (refer to Figure 1) onto the case flange.

3. Remove the cover and drill through the case using a No. 3 standard (.213 in.) drin bit.

4. Tap the new bolt hole using a M6 x 1.0 metric tap.

Parts Information - 325-4L

KIT NO. 8635959 KIT NO. 8635964 ---------------- --------------- Qty Description P/N Qty Description P/N --- ----------- --- --- ----------- ---- 1 Oil Pan 8635854 1 Sprocket Cover 8635855 1 Gasket, Oil Pan 8635884 1 Gasket, Sprocket Cover 8639726 15 Bolt Assembly 8643693 18 Bolt Assembly 8639743 1 Instruction Sheet 1 Instruction Sheet

All parts are available separately or as a kit from GMWDD.

For warranty purposes, use the fonowing:

Oil Pan/Gasket Labor Operation Number K6500 for .5 hour.

Sprocket Cover/Gasket Labor Operation Number K7510 for 3.8 hours. ADD: If necessary to drill and tap holes (82 only) - .2 hour.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.