Question about 1999 Ford Escort

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1999 escort zx2 timing belt broke

Do the valves get bent bent when belt breaks??

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The ZX2 Zetec is a non-interference engine. This means the valves are not capable of touching the pistons at any time. If your belt breaks, there will not be any valve damage. There are reliefs cut into the top of the pistons that allow clearance for the valves if the belt breaks. Most engines are interference and will cause several hundred or even thousands of dollars of damage when a timing belt breaks. Most shop manuals list the ZX2 as interference but it is not. Many people seek out this how-to because a mechanic has informed them that they have valve damage and quoted a repair price over $1000.

Posted on Apr 03, 2009

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Yes this is possible, it is an interference engine, but there is a chance that it didn't (bang a valve), i've seen this have a good ending many times. so if you are replacing the belt your self go ahead and do it ,...you might have one of the lucky cars and it will run great.

Posted on Oct 07, 2008

The zx2 is an interference free engine and this means that there will not be any damage done if the timing belt breaks.

Posted on Oct 29, 2008

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Not always but ... sadly usually..... therer are many other things that can also break.
Sorry for the bad news
LB

Posted on Oct 07, 2008

  • Larry Oct 07, 2008

    More info .....

    Interference Engines and Timing Belts
    By: Ralph Hoffmann

    Interference Engines: ........ Useful information by AutoTruckData.com
    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) to transmit torque from the engine crankshaft o the engine camshaft that opens the valves that admit air and fuel. (Note: on some new cars the fuel is admitted not through the valves but through injectors in the top of the cylinder. Rather than use a steel timing chain, interference engines may use a rubber timing belt with its limited life, whereas steel timing belts typically last 150,000 to 200,000 miles or more.
    Valves open further in an interference engine and project further into the combustion chamber than in a 'free-running' engine. This allows outside air at atmospheric pressure flow faster into the combustion chamber through the larger valve opening. The engine can therefore inhale more air, be a little smaller, and still create as much power while reducing its manufactured cost and also guaranteeing future repair business for its dealer. If a rubber timing belt breaks by not being replaced soon enough, some of the valves stuck in their open position will collide with the top of the pistons, thereby breaking or irreversibly damaging one or the other or both.

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If timing belt breaks ,will it bend the valves


I looked at interference engine list.
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This is catastrophic for the engine and there will be damage beyond the inevitable bent valves. This is the cost of poor preventative maintenance.
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