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1987 944 wont stay in time

I purchased a 1987 944 for my son that the timing belt had broken on and messed up the valves on. previous owner had the belts and water pump replaced but the shop never looked at the head itself. So starts my adventure first Im not that unfamiliar with Porsche had a few always did my own work but always had 1st gen models. put a new head on put all the drive components back together cranked right up ran for about 20 sec then died slowly. double checked everything to find my cam shaft was 2 teeth off prior to tdc readjusted the cam tightened everything up same thing again and again. Could the belt tensioner be bad or am I missing something?

Old 01-07-2014, 11:28 AM
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After putting the belt on and lining it up, crank the car over by hand a couple times to make sure the marks have not moved.
Old 01-07-2014, 01:01 PM
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make sure the marks align when the belt is tight on the side in the direction of engine rotation.
Old 01-07-2014, 02:15 PM
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tensioner could be bad, your camshaft wooddriff key could be bad as well.
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Old 01-07-2014, 04:09 PM
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The tensioner has a tendency, as least in my experience, to offset a couple of teeth on the first crank of the engine.

as bordin34 and djnolan says:

Crank it slowly by hand first to make sure it doesn't. Takes a few tries to get it right, sometimes you have to offset the cam teeth so it'll line up right when the tensioner tensions.

Also, are you sure you used correct TDC? Not the halfstroke? That will make it not line up right too.
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Old 01-07-2014, 04:22 PM
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thanks for the comments

I'm pulling the cam sprocket today to check it out then will start everything all over again. again thanks for the advice this is to be my sons first real toy so I'm busting my butt to get it all worked out before he heads back to collage
Old 01-07-2014, 08:58 PM
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When you put tension on the belt, the cam will typically roll a couple of degrees. You need to anticipate this by rolling the cam gear back 1 or 2 teeth prior to putting tension on the belt.

Roll the engine over by hand atleast once and double heck your timing marks.
Old 01-08-2014, 07:00 AM
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I know the cam has a tendency to shift with the tensioner Ill try that first before taking the cam gear off, thanks
Old 01-08-2014, 08:34 AM
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got to love shops tht dont have a clue

found my problem the shade tree shop that worked on the car before I got it put the wrong belt on it and bent the tensioner spring assembly GRRRRRR, like I tell my kids if you don't know what something is DON'T TOUCH IT!

Old 01-08-2014, 12:11 PM
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