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Many engines these days are what is called "interference" engines - that is, if the timing belt breaks various parts of the engine, particularly the valves and pistons will collide with one another because with the belt broken their carefully timed synchronised movements are no longer carefully timed.

If the RAV4 engine is an "interference" engine, which it probably is, and the belt breaks (which is more likely to happen while the engine is running fairly fast - eg, when you are accelerating), the result will be a loud noise and massive, expensive damage, possibly irrepairable.

Timing belts are very cheap by comparison - don't risk it !

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Q: Timing belt replacement timing for 1999 Rav4 - Will not replacing the timing belt damage the engine if it breaks?
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