Timing Case Profile Gasket - Coolant Leak

Group
Engine

Bulletin Number
11 10 93 (3885)

Woodcliff Lake, NJ
November 1993
Product Engineering

This Service Information bulletin supersedes orange S.I. 11 10 93 (3885) dated October 1993, which should be removed from your S.I. binder and discarded.

SUBJECT:
Coolant Leak from Timing Case Profile Gasket

MODELS:
E30 and E36 with M42 Engine

Situation:

A coolant leak may be detected coming from the front area of the cylinder head and upper timing case sealing surface due to a deteriorated rubber timing case profile gasket.

Correction:

New timing case profile gaskets with an optimized rubber material composition have been phased into production on E36 (M42) vehicles as of approximately 10/93.

If a coolant leak is detected coming from the front area of the cylinder head and upper timing case, the cylinder head should be removed from the engine as per procedures outlined in the Construction Group Repair Manual, Group 11, and the profile gaskets should be replaced with the new optimized profile gaskets.

Repair Note:

If pitting is evident on the sealing surface in the area of the coolant passageway on the front of the cylinder head, repairs may be performed by using J-B Weld(R) cold weld compound (locally available).

Following the manufacturer's instructions on the package, using a straight edge tool, i.e., razor blade, plastic trowel, etc., fill in the pitted area thus restoring a smooth sealing surface on the cylinder head.

When applying the cold weld compound to the affected cylinder head sealing surface:

- Only use enough sealing compound to fill in the pitted areas of the cylinder head to restore the original sealing surface around the coolant passage.

- All excess sealing compound should be removed from the coolant passage area before it cures.

- To avoid additional machining of the cylinder head a smooth sealing surface should be achieved before the sealing compound cures.

- Do not reinstall the cylinder head until the sealing compound is fully cured according to the manufacturer's instructions.





Parts Information

All old part number gaskets listed have been purged from PDC inventory and only the new part numbers are available.

Old gaskets in dealerstock, P/N 11 14 1 721 806 and 11 14 1 721 807 should be returned to your facing PDC. When using the return system, use Tech 7 as the reason code. This return code will be valid until March 30, 1994.

Currently, gasket sets used for E30 M42 engines, P/N 11 12 9 063 333, and E36 M42 engines, P/N 11 12 9 065 439, contain the old part number timing case profile gaskets. When using these sets, the part number gaskets should be replaced (and returned to your facing PDC) with the new part number gaskets until further notice.