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Classic/Antique Car Repair/300xz 1988
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Question
I have a non turbo 1988 v6 twin overhead cam. The timing belt broke and I wanted to know if the valves clear the pistons on this car. Could I just put on a new timing belt and go or did the valves get bent? Thanks
Hi Dustin:
Sorry to hear about your timing belt. Well, the answer to your question is based on "Belt" or "Chain". If you have a timing belt, then you have a "Interference Engine". However, if you have a "Timing Chain", it is "Non-Interference"
An interference engine is an engine design that has been avoided by some manufacturers for well over 80 years. General Motors, Chrysler, etc., typically use a metal chain-type timing belt on push-rod engines often called a timing chain. Rather than use a steel timing chain, interference engines may use a rubber timing belt with its limited life, where as steel timing belts typically last 150,000 to 200,000 miles or more.
So, when the "Belt" breaks, some of the valves stuck in their open position will collide with the top of the pistons, thereby breaking or damaging them.
Belt = Bent Valves, Chain = NO Bent Valves.
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Answers by Expert:
Vern Bullock
Expertise
Visit my website at: http://www.classytransportation.com/ I can answer most questions about autos built in the 60's 70's and 80's. Specifically, Lincolns, Rolls Royces and the Excaliburs. Mechanical issues and technical questions are my expertise. I also have a general knowledge of most older automobiles. Keep in mind, I can only provide answers if the questions are very specific and complete. Without details, I can only speculate and that's not good for solving your problem.
Experience
I have owned and maintained Silver Shadows for over 10 years now. I find most mechanics and even Rolls Royce mechanics have very little knowledge about these automobiles. I have researched these cars in quite a bit of detail and can pretty much tell you what is wrong, if you can describe the behavior in detail. I have saved quite a few RR owners a lot of money and aggravation due to improper diagnosis. I am the owner of Classy Transportation, LLC a luxury limousine service specializing in antique cars, classic cars, vintage cars and exotic cars.
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Classy Transportation, LLC Limousine Service.
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All around the Internet
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I hold a BS degree in computer science and a MS degree in mechanical engineering.
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I regularly compete at car shows and average around a dozen awards annually.
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