Advance Service Info - Mis-Machined Engine Oil Gallery - Inspect/Replace Engine

Some of the engines in the subject vehicles may have been built with a mis-machined oil gallery.

Dealers will inspect for this condition by performing an engine RPM ramp up test and listening for a low end knock noise.

Engine RPM Ramp Up Test:

1. Start the engine and warm the engine to normal operating temperature.
2. Keep the transmission in ‘Park’ position and depress and hold the brake pedal.
3. Accelerate the engine from idle to 4400 rpm over a 5 second ramp up time.
4. Hold the engine speed at 4400 rpm for 40 seconds, but abort the test if an audible lower end knock is heard.
5. Decelerate the engine from 4400 rpm to idle over a 5 second ramp down time.
6. Idle the engine for 5 seconds while checking for audible lower end knock.
7. Repeat cycle steps 2 through 6 for either 10 complete cycles or until an audible lower end knock is detected during the test.

If the engine exhibits a lower end knock noise during or after the Engine RPM Ramp up test, then replace the engine using the appropriate service information.

Contact the Product Quality Center (PQC) for engine replacement approval and to order an exchange engine assembly.

Important: Failure to return the concerned engine will result in the dealership being debited in the amount of an entire engine assembly (dealer net).

The removed unit must be returned complete in the original exchange shipping container. For effective engineering analysis, please do not remove any components. Dress items on the removed unit must remain the same as the replacement engine (e.g., exhaust manifolds, throttle body, etc.). Dealerships returning engines/components having been even partially disassembled will be judged as violating this procedure and, as such, will be billed for all materials furnished.

Notice: The exchange unit will be shipped with a quantity of oil; check oil level before starting the engine. Low oil level could result in internal engine damage.

Included with the exchange unit will be return shipping instructions, including a return shipping label (freight collect at destination) and partially completed Bill of Lading.

The Warranty Parts Center (WPC) will fax a Special Part Request to your dealership requesting the return of the removed engine. DO NOT wait for the warranty claim to be paid before returning the removed engine. DO NOT SHIP AN ENGINE TO THE Warranty Parts Center (WPC) WITHOUT AN OFFICIAL WPC REQUEST.

The Special Part Request will provide a request number. This request number must be written on the outside of the return container using a permanent marker. Failure to write the request number on the return container may delay the processing of your return.

If you do not receive the WPC Special Part Request, contact Annette Quince at 248-371-9939 (for French call PQC 1-866-654-7654) to obtain the proper paperwork in order to return the removed engine. Failure to return the engine may result in a debit.

1. Remove the engine assembly/component as outlined in the applicable Service Manual. Drain all fluids from the removed engine.
2. Retorque any fasteners that were loosened or removed to the original torque specification.
3. Remove any plastic shipping plugs and covers from the exchange unit and install them on the removed unit.
4. If the concerned engine leaks, mark the area directly on the engine with a permanent marker.
5. Write the PQC case reference number on the repair order form.
6. Write the PQC case reference number on the component in a visible location.
7. Place the removed engine into the original shipping container. Attach completed core return shipping tag to engine.

1. Place a copy of the WPC request, repair order, the completed return checklist/product feedback form into the plastic envelope. Remove the original shipping label and attach the plastic envelope with the return shipping label on it to the container. The Bill of Lading and Custom’s Papers (for Cross-Border Shipments) provided with the exchange engine are the only other documents required to be inserted into the envelope to return the removed engine.
2. Write the WPC request number and the PQC case reference number on the outside of the container with a permanent marker. To simplify the Exchange Program's core return process, the WPC will be coordinating all activities for core returns. See Service Bulletin 99-00-89-019 (Dealers in Canada should refer to Home Office Letter 99-201) for detailed shipping information.
3. Contact Yellow Transportation at the phone number shown on the Yellow Transportation bill of lading to arrange for the pick up of the removed engine.
4. Have the Yellow Transportation driver sign the bill of lading. Retain a copy of the signed bill of lading. Attach your copy to the original repair order. This will be your proof of returning the removed engine.
5. Ship all returned exchanges/components with appropriate paperwork to:

Third Party Freight Collect

GM Warranty Parts Center

45 Northpointe Drive

Orion, MI 48359

For vehicles repaired under warranty, use:

Important: Applicable miscellaneous items such as engine oil and coolant should be added to the part allowance amount and claimed in the Parts Cost column and not included in the Net Amount (DMN) column of the warranty claim.

Notice: 

U.S. Dealers:

This correction should be performed on all vehicles currently in your inventory that are included in the Administrative Message VIN list prior to sale or delivery.