2006 - 2013 Corvette Z06: Service Bulletin: Information on Customer Questions About Valve Guide Wear


#13-06-01-001:  Information on Customer Questions About Valve Guide Wear - (Jan 14, 2013)

Subject:  Information on Customer Questions About Valve Guide Wear

Models:  2006-2013 Chevrolet Corvette 427, Corvette Z06 Equipped with 7.0L V8 Engine (RPO LS7)

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Customer Concern

Some owners of Corvettes equipped with the LS7 7.0L V8 engine may ask your dealership to check their vehicle for valve guide wear because of information that has been distributed on the internet, primarily at Corvette enthusiast sites. Due to these postings, some customers that have not had an issue may ask to have their vehicle checked. If a customer presents their vehicle and requests the valve guides be checked, the following information may be helpful to you and alleviate any concern for your customer.

Valve Guide Wear / Noise Concerns

To address any concern the customer may have, listen to the customer's request and ask the following questions to differentiate if the customer has experienced a correctable engine concern or has anxiety over information they may have read.

Important:  It is important to investigate all concerns and relay good factual information to your customer. If a customer indicates a concern about valve guide wear, it is possible they may have a valid unrelated engine issue, and do not know how to express the actual concern.

  1. Have you experienced any concerns or difficulties that would indicate an engine problem?
  2. Is the Check Engine Light ON? Does the vehicle exhibit any starting/running concerns?
  3. If the concern is noise related, ask for a description of the type of noise heard?

Once the information is collected, and the nature of the customers concerns are known, here are some guidelines for appropriate actions:

Aftermarket Equipment and Valve Guide Wear

The use of performance engine modifications has been found to accelerate valve guide wear. Replacement aftermarket mechanical parts, or software calibrations, may adversely affect the wear of these and other components. Any modification to the engine of GM vehicles voids the powertrain coverage portion of the vehicle warranty. For additional information on GM policies regarding aftermarket equipment and calibrations, please refer to the GM Service Policy & Procedures Manual, article 1.4.14 (Voided Warranties and Branded Titles) and article 1.2.2.12 (Non-GM Parts & Equipment and Original Equipment Alterations), along with the latest versions of Corporate Bulletin numbers 09-00-89-016 and 09-06-04-026 for additional information.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.

© Copyright General Motors Corporation. All Rights Reserved



Article ID: 43
Created On: Wed, Jul 2, 2014 at 8:26 PM
Last Updated On: Wed, Jul 2, 2014 at 8:27 PM

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