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Timing keeps jumping out, after replacing timing belt.

(1999 Kia Sportage)
in Columbus, PA on February 06, 2011
What holds the timing belt gear on the crank? Could it be slipping on the crank or could the crank be broke?
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Popular Answer
on February 06, 2011
The timing sprocket on the crank is positioned by a machined key in a groove (keyway). If this is broken, you have problems because the crank could be damaged. If the front end of the crankshaft were broken off and slipping, I think there'd be lots of damage and obvious to anyone who looked. You can pull the sprocket off the end of the crank and inspect the key and keyways in the parts.
If that's all OK, most likely it's not tensioned right, there are two tensioner pulleys and I think one is spring loaded. It probably comes with a new tensioner in a kit. If the spring is not OK, the timing belt sould likely jump and lose timing. This is an 'interference' engine so it's important to keep the cams in time. If your belt has jumped time, I think it's damaged and you need to get a new one. carefully check out how the pulleys are positioned, I think there's a wrong way to do it on this engine which would cause difficulty keeping the engine in time.
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