Campaign - Engine Flywheel / Clutch Interference: Overview
Bulletin No.: 06523BDate: April 18, 2006
CUSTOMER SATISFACTION
Subject:
06523A - ENGINE FLYWHEEL / CLUTCH INTERFERENCE
Models:
2006 CHEVROLET CORVETTE
EQUIPPED WITH 6.0L V8 (RPO LS2 - VIN U) OR 7.0L V8 (RPO LS7 - VIN E) ENGINE AND 6-SPEED (RPO MM6 or MZ6) MANUAL TRANSMISSION
Supercede:
THIS BULLETIN IS BEING REVISED TO CLARIFY THE INSPECTION STEPS IN THE "SERVICE PROCEDURE". PLEASE DISCARD ALL COPIES OF 06523A.
**********THIS RECALL IS IN EFFECT UNTIL MARCH 31 2007**********
Condition
Certain 2006 Chevrolet Corvette model vehicles equipped with 6.0L V8 (RPO LS2 - VIN U) or 7.0L V8 (RPO LS7 - VIN E) engine and manual transmission may have a condition in which the flywheel may have been incorrectly machined, resulting in insufficient clearance for clutch cover self adjustment, reducing clutch life.
This program will expire on March 31, 2007.
Correction
Dealers are to inspect and, if necessary, replace the engine flywheel.
Vehicles Involved
Involved are certain 2006 Chevrolet Corvette model vehicles equipped with 6.0L V8 (RPO LS2 - VIN U) or 7.0L V8 (RPO LS7 - VIN E) engine and manual transmission and built within the VIN breakpoints shown.
Important:
Dealers are to confirm vehicle eligibility prior to beginning repairs by using the GM Vehicle Inquiry System (GMVIS). Not all vehicles within the above breakpoints may be involved.
For dealers with involved vehicles, a listing with involved vehicles containing the complete vehicle identification number, customer name, and address information has been prepared and will be provided through the applicable system listed below. Dealers will not have a report available if they have no involved vehicles currently assigned.
- US GM - GM DealerWorld Recall Information
- Canadian GM - GMinfoNet Recall Reports
- Export dealers - sent directly to dealers
The listing may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this program is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete this program.
Parts Information
Parts required to complete this program are to be obtained from General Motors Service Parts Operations (GMSPO). Normal orders should be placed on a DRO = Daily Replenishment Order. In an emergency situation, parts should be ordered on a CSO = Customer Special Order.
Important:
Due to the small number of vehicles involved and due to limited initial parts availability, dealers are encouraged not to order program parts for use as shelf stock. Parts should only be ordered when inspection determines that it is necessary to replace the flywheel.
Service Procedure
Important:
The service procedure contained in this program is different from the service procedure found in the appropriate service manual. As a result, the labor time allowance has been revised to correspond with this new service procedure.
Flywheel and Clutch Assembly Inspection for 2006 Chevrolet Corvette Vehicles Equipped with a 6.0L (LS2) or 7.0L (LS7) Engine and 6-Speed Manual Transmission (MM6/MZ6)
Important:
The bell housing must be removed from the engine before you can inspect the clearance between the rivet head on the clutch pressure plate cover and the raised step on the flywheel.
1. Refer to Clutch Assembly Replacement procedure for the 6.0L (LS2) engine or 7.0L (LS7) engine in SI.
2. Perform the inspection after the bell housing has been removed from the engine. Do not remove clutch assembly before performing inspection.
3. Inspect the clearance between each rivet head on each pressure plate plug and the raised step on the flywheel. There are three locations on the clutch pressure plate to inspect.
3.1. Rotate the flywheel while it is attached to the engine to bring each pressure plate lug rivet head into view.
3.2. Use a feeler gauge with a stock thickness of 0.05 mm (0.002 inch) to determine if there is interference between each of the pressure plate lug rivet heads and the flywheel step.
3.3. Slide the feeler gauge horizontally along the shallow flywheel step.
^ The clearance between each of the three pressure plate lug rivet heads (1) and flywheel step must be 6 mm (15/64 inch) or greater at all three locations. If the clearance between the pressure plate lug rivet head (1) and the flywheel step is 6 mm (15/64 inch) or greater at all three locations, the flywheel does not require replacement. Reassemble the vehicle components and proceed to step 5. Refer to Clutch Assembly procedure for the 6.0L (LS2) engine or 7.0L (LS7) engine in SI.
^ If the clearance between the pressure plate lug rivet head (1) and the flywheel step is greater than 0.05 mm (0.002 inch), but is less than 6 mm (15/64 inch) at any of the three pressure plate lug rivet head (1) and flywheel step locations, replace the flywheel only. Perform service procedure steps 2, 3 and 5. Refer to information in third bulletin point before replacing the flywheel.
^ If there is less than 0.05 mm (0.002 inch) clearance between any of the pressure plate lug rivet heads (1) and flywheel step locations, the flywheel and clutch assembly must be replaced. Perform service procedure steps 2-5.
Important:
Remove the clutch pressure plate bolts in the sequence shown, starting with the number one and following in numerical order.
4. Remove the flywheel. Refer to Engine Flywheel Replacement and Engine Flywheel Removal procedures for the 6.0L (LS2) engine or 7.0L (LS7) engine in SI.
Important:
During the powertrain build process, balance weights may be added to the flywheel. Install the same size balance weights onto the new flywheel in the same location as the old flywheel. Apply Threadlocker - Red. GM P/N 12345382 (Canadian P/N 10953489). or equivalent. to balance weights before pressing them into the flywheel.
3. Install new flywheel (P/N 12571611). Refer to Engine Flywheel Installation and Engine Flywheel Replacement procedures for the 6.0L (LS2) engine or 7.0L (LS7) engine in SI.
Important:
Remove the clutch pressure plate bolts in the sequence shown, starting with the number one and following in numerical order.
4. Install a new clutch kit, P/N 24233084 (LS2) P/N 24236500 (LS7) and assemble vehicle components. Refer to Clutch Assembly Replacement procedure for the 6.0L (LS2) engine or 7.0L (LS7) engine in SI.
5. Perform vehicle road test.
Claim Information
Submit a Product Claim with the information shown.
Customer Notification - For US and Canada
General Motors will notify customers of this program on their vehicle (see copy of customer letter shown in this bulletin).
Customer Notification - For Export
Letters will be sent to known owners of record located within areas covered by the US National Traffic and Motor Vehicle Safety Act. For owners outside these areas, dealers should notify customers using the sample letter.
Dealer Program Responsibility - All
All unsold new vehicles in dealers possession and subject to this program must be held and inspected/repaired per the service procedure of this program bulletin before customers take possession of these vehicles.
Dealers are to service all vehicles subject to this program at no charge to customers, regardless of mileage, age of vehicle, or ownership, from this time forward. Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is shown in this bulletin for your use in contacting customers. Program follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter.
In summary, whenever a vehicle subject to this program enters your vehicle inventory, or is in your dealership for service in the future, you must take the steps necessary to be sure the program correction has been made before selling or releasing the vehicle.
Disclaimer