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Virginia Rocks!
Join Date: Oct 2003
Location: Just outside the beltway
Posts: 8,497
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One last belt question before I dig in..
I'm going to do the belts tommorow. I am reading the factor manual tonight and it talks about turning the engine "anitclockwise" 1.5 teeth. My question is, "why?"
To relieve any pent up tension? Sorry for not doing a thorough search.
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Rosewood 1983 911 SC Targa | Black 1990 944 S2 | White 1980 BMW R65 | Past: Crystal 1986 944 na Guards Red is for the Unoriginal
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01-06-2006, 05:44 PM
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Registered
Join Date: Jun 1999
Location: Vernon, CT
Posts: 849
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Quote:
When you rotate the engine clockwise with a breaker bar, as the timing belt turns the cam, you'll notice that the lower sprocket is "pulling" on the long side of the cam belt. Well, the long side is the side you measure tension on. If that side of the belt has been pulled tight, by the action of turning over the engine, the tension reading would be artifically higher, inflated by whatever "pent up tension" is in the belt, due to the manual rotation of the engine. By turning it counterclockwise "anticlockwise", you make the other side of the belt the "tight side", and the side you're meauring is now the "slack side" That's what the factory tension specs are based on, measurements on the slack side.
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Mike '92 968 '01 VW Jetta TDi |
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01-06-2006, 06:23 PM
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I usually turn the engine over at about 5,000 rpm around tight corners in second gear to alleviate pent up tension.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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01-06-2006, 06:42 PM
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1983 Porsche 944 2.5 liter
