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Manual Crankshaft Turning

1947verns
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1947verns Member

1947verns

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I want to do a leakdown test on my 1998 Boxster, I need to rotate the crankshaft pulley to position the cylinders to top dead center, but the crankshaft pulley does not turn when a socket wrench is applied to the crankshaft pulley. What is needed to free up the crankshaft pulley? The engine is in the car. Please advise. Thanks.

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JFP in PA Member

JFP in PA

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1 hour ago, 1947verns said:

I want to do a leakdown test on my 1998 Boxster, I need to rotate the crankshaft pulley to position the cylinders to top dead center, but the crankshaft pulley does not turn when a socket wrench is applied to the crankshaft pulley. What is needed to free up the crankshaft pulley? The engine is in the car. Please advise. Thanks.

 

Welcome to RennTech:welcomeani:

 

You have a potentially major issue here; if the crank cannot be turned by hand with a wrench, either the engine is seized, or something is mechanically jamming the rotating assembly (are you sure the trans is out of gear?).  If the trans was in neutral, you need to do further diagnostics into why it won't rotate, which could get into serious disassembly, including dropping the engine out.  In almost any permutation as to why this is happening, you are looking at some serious $, and trying to force it to rotate will only worsen the situation.

 

Good luck.

1947verns Member

1947verns

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Prior to pulling the plugs the engine was started and ran with no issues. The transmission was in neutral and the clutch was depressed when trying to turn the crankshaft pulley.

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JFP in PA Member

JFP in PA

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35 minutes ago, 1947verns said:

Prior to pulling the plugs the engine was started and ran with no issues. The transmission was in neutral and the clutch was depressed when trying to turn the crankshaft pulley.

 

When looking at the lower pulley on the front of the engine, which direction did you attempt to turn it, clockwise or counterclockwise?

1947verns Member

1947verns

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I have been able to free up the crankshaft pulley by turning over the engine via the starter then manually turning the crankshaft pulley with a socket wrench. Thanks for your consideration.

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