EI08221 - 3.5L, 3.9L, LZG, LZE, LZ4, LZ8 Engine Oil Leak at Front (Accessory Drive End) or Rear (Transmission End) of Engine (Diagnostic Information)

This bulletin is being revised to end the need for engineering information and provide feedback. Please discard Corporate Bulletin Number 08-06-01-016A (Section 06 -- Engine).

Some customers may comment about an engine oil leak. Upon inspection the technician may find the oil leak appears to be coming from above the rear main seal or the oil pan gasket.

The oil passageway block plug located above the crankshaft may not be tight.

Diagnose the engine oil leak by thoroughly cleaning the area, adding dye to the system, and using a black light to identify the source of the leak.

Only if the source of the leak is the oil passageway plug, contact Jim Kelly at 586-492-5612. Provide Jim with the following information:

Proceed with the following steps:

1. Remove components as necessary in order to access and remove the leaking oil passageway plug.
2. Inspect the plug for any signs of damage and replace the plug if necessary.
3. If reusing the original plug, apply sealant to the threads before installing. Service replacement plugs come with a pre-applied sealant already on the threads.
4. Install the plug.

Tighten
Tighten the plug to 33 N·m (24 lb ft).

For vehicles repaired under warranty, in which the oil leak was caused by the oil passageway plug, use the labor operation listed in this bulletin. For all other sources of the engine oil leak, submit the warranty claim using the appropriate published labor operation: