2003 Kia Sorento Crank will not turn manually

Tiny
JUANR274
  • MEMBER
  • 2003 KIA SORENTO
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
I replaced water pump and belt but now engine will not turn manually. I turn it with a ratchet and it stops at about quarter to half turn. What would cause that?
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Wednesday, September 3rd, 2014 AT 12:39 PM

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Tiny
CARADIODOC
  • EXPERT
How did you release the tension on the timing belt? There's a hydraulic tensioning device that must be removed to be reset. You collapse it in a vise, then stick a pin through the hole in the side of the body to hold it collapsed. You'll need to find the timing marks and put the belt back on correctly, then install the tensioner, recheck the timing, then pull the pin out. Recheck the timing again, then again after rotating the crankshaft two full revolutions in the normal direction of rotation.

If the valves hit the pistons when you turned the crankshaft by hand, it's very unlikely they were damaged, but if they hit while cranking the engine with the starter, there's a good chance some valves will be bent. You'll know that if there's a misfire when the engine is running.
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Wednesday, September 3rd, 2014 AT 1:27 PM
Tiny
JUANR274
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The thing is I cannot turn it 2 full rotations. What can cause that?
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Wednesday, September 3rd, 2014 AT 1:32 PM
Tiny
CARADIODOC
  • EXPERT
The pistons are hitting the valves that are open. You have to remove the timing belt, then turn the camshafts until the timing marks are at the specified locations. Then you can turn the crankshaft to line its mark up. You'll need to remove the tensioner to get the belt off. What you have to watch is the camshafts will want to turn a little when the slack in the belt is taken up by the tensioner. That's why you have to double check for correct timing multiple times. Once everything appears to be correct, and you rotate the crank twice, any additional slack will get removed but the timing marks should still be in the correct relationship.

If either camshaft is off by one tooth, you'll feel the loss of power and you'll likely have a Check Engine light and a diagnostic fault code related to "cam and crank sync". Typically pistons hit and bend the valves when a cam sprocket is off by as little as three teeth.

If you can't turn a camshaft when the timing belt is off, carefully turn the crankshaft one way or the other so it's away from top dead center. It doesn't take much, but that will move all the pistons so none of them are up high enough to hit any valves. At that point you can turn the camshafts easily to get them to the correct positions, THEN you can bring the crank back to top dead center.
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Wednesday, September 3rd, 2014 AT 2:00 PM

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