Transfer Case Vent - Fluid Leak
GMC NUMBER: 91-7D-190GROUP: 7D Transfer Case
DATE: August 1992
CORPORATE NUMBER: 267401
SUBJECT:
FLUID LEAK FROM TRANSFER CASE VENT (INSTALL REVISED VENT PIPE)
MODELS:
1988-91 "K" TRUCK WITH NEW PROCESS 241 TRANSFER CASE
Some owners of 1988-91 K Trucks equipped with a New Process 241 transfer case (Figure 1) may comment that their vehicle experiences a fluid leak from the transfer case vent. This leak usually occurs during normal highway driving in 2H.
This condition may be caused by fluid spray from the planetary carrier entering the vent pipe (Figure 2) and being forced out the vent hose.
To correct this condition, it is necessary to install a revised vent pipe (P/N 15958721). The opening of the revised vent pipe has been moved from the end of the pipe to the side of the pipe. This prevents fluid from entering the vent pipe and leaking from the vent hose.
SERVICE PROCEDURE
1. Remove the transfer case from the vehicle. Refer to the appropriate C/K Service Manual, Section 7D, "TRANSFER CASE REPLACEMENT" for the complete transfer case removal procedures.
2. Remove the transfer case vent pipe (Figure 2).
3. Install a new vent pipe (P/N 15958721). Use RTV sealant or equivalent on the mating area between the vent pipe and case.
Important
The new vent pipe must face to the front of the vehicle. If it is not installed facing to the front, the transfer case may continue to leak.
4. Install the transfer case into the vehicle. Refer to the appropriate C/K Service Manual, Section 7D, "TRANSFER CASE REPLACEMENT" for complete transfer case installation procedures.
SERVICE PARTS INFORMATION
Part Number Description Qty/Veh
15958721 Vent Pipe 1
Parts are expected to be available on 8/17/92. In case of limited inventory, parts will be placed on 400 control to waive VIP surcharges. Only verifiable emergency orders will be accepted. GMSPO will make every effort to obtain parts. However, the part will be shipped premium transportation at the dealer's expense and all other order types will be placed on backorder until the 400 control is removed.
WARRANTY INFORMATION
For vehicles repaired under warranty use:
Labor Operation:
T7501
Labor Time:
1.0 hrs.
Note:
Labor Operation is coded to the base vehicle coverage in the warranty system.