Question about 1996 Ford Windstar

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How can a piston break or what causes it to break

Had a piston break after heads were changed

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If you changed the heads you should have gone that one more step and changed the pistons. sometimes if the heads arent mic ed right it causes a catch in the running position and causes the break. i assume the heads you put on were new and now salvage yard material??

Posted on Dec 08, 2008


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The Kia engine has two overhead camshafts that have to be properly aligned when installing the cylinder head. If you didn't get the timing marks on the cam pulleys as well as the crankshaft pulley lined up the valves will hit the pistons the first time you crank it over. If the valves hit the pistons, they will bend and no longer seal [no compression]. For instance, if the timing belt breaks while the engine is running here is a picture of the result [also no compression]:
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This forum post is worth reading completely:
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