Info - Cartridge Type Crankshaft Rear Main Seal. Cadillac Concours 1996

For 1990-2009 cars

# Info - Cartridge Type Crankshaft Rear Main Seal

Subject: | Cartridge Type Crankshaft Rear Main Seal

Models: | 1996-1999 Cadillac Concours, DeVille, Eldorado, Seville

| 1996-1999 Oldsmobile Aurora

| with 4.0L or 4.6L Engine (VINs C, Y, 9 -- RPOs L47, LD8, L37)

This bulletin is being revised to add additional information on the Cartridge Type Crankshaft Rear Main Seal. Please discard Corporate Bulletin Number 00-06-01-005 (Section 06 -- Engine/Propulsion System).

A cartridge type crankshaft rear main seal (Figure 1 - number 3) has been released for the 4.0L and 4.6L engines identified above. The cartridge type crankshaft rear main seal is identified by a metal flange located on the inner diameter of the seal which presses onto the crankshaft. The previous crankshaft rear main seal (Figure 1 - number 2) is a conventional lip type seal and has a soft rubber like material in the center where it contacts the crankshaft instead of this metal flange.

Important: The cartridge type crankshaft rear main seal is retained to the crankshaft with a press fit that requires over 45 kg (100 lb) of force to remove or install.

These high removal and installation forces make it necessary to remove the cartridge type crankshaft rear main seal with Kent-Moore Tool J 42841 (Figure 2) and install it with Kent-Moore Tool J 42842 (Figure 3). Refer to SI for Crankshaft Rear Oil Seal Replacement (Cartidge Type Seal) for instructions on the proper use of these tools. In addition, the cartridge type crankshaft rear main seal incorporates precise internal sealing surface relationships which are maintained for optimal sealing by using Kent-Moore installation tool J 42842.

DO NOT use Kent-Moore Tool J 38817-A (Figure 1 - number 1) to install the cartridge type crankshaft rear main seal. Attempting to install the cartridge type crankshaft rear main seal with Kent-Moore Tool J 38817-A will result in a damaged or improperly installed crankshaft rear main seal and will damage Kent-Moore Tool J 38817-A.

The cartridge type crankshaft rear main seal will be used to service 1996-1999 past model engines built after Engine Unit Number (EUN) T10L423109 which were installed in vehicles built after March, 1996.

#### Figure 1

(1) | J 38817-A Rear Main Seal Installer
(2) | P/N 12556355 Crankshaft Rear Main Seal supersede to P/N 12568025
(3) | P/N 12568025 Crankshaft Rear Main Seal (Cartridge Type)
(4) | J 42842 Crankshaft Rear Oil Seal Installer

#### Figure 2 -- J 42841 Crankshaft Rear Oil Seal Remover

#### Figure 3 -- J 42842 Crankshaft Rear Oil Seal Installer

### Parts Information

Part Number | Description
--- | ---
12568025 | Seal, Crankshaft Rear Main (cartridge type)