what will stop truck from turning over by hand

2006 GMC SIERRA
105,000 MILES
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BIGDADDY1968
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truck was running fine and stopped one day on side of road, it cranked back up went a little more then quit, got it home and it turned over real slow and made a rubbing noise, cranked for a second but won't turn over, did turn over a little today, can't turn over by pull bar on the crank pully?
Sep 29, 2012 at 5:32 PM
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ASEMASTER6371
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check oil level.

was there any noise prior to this??

do you have a gauge in the truck??

Roy
Sep 29, 2012 at 5:47 PM
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BIGDADDY1968
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oil is good, no noise and yes truck has gauges
Sep 29, 2012 at 8:27 PM
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KHLOW2008
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Try reversing the turning direction of the crankshaft to see if you can move much. Seems like you could have a fault with the timing chain.
Sep 29, 2012 at 8:37 PM
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BIGDADDY1968
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cant turn either way, would broke timing chain keep it from turning over?
Sep 29, 2012 at 8:50 PM
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KHLOW2008
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Can't turn it either way can mean a seized engine due to lubrication faults. A broken timing chain would normally allow you to at least reverse the turning direction slightly unless the chain is stuck badly.
Sep 29, 2012 at 9:00 PM
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BIGDADDY1968
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would torque converter stop it from turning over if it were bad?
Sep 29, 2012 at 9:11 PM
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KHLOW2008
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No, you should still be able to crank the engine. Loosen all the drivebelts and test, it could be one of the components, but you mentioned a breaker bar did not work so it would more likely to be engine mechanical.
Sep 30, 2012 at 7:41 AM
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