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Registered
Join Date: Sep 2005
Location: Huntsville, AL
Posts: 28
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Help with Vibration
I just got my 924S back from the shop where I had among other things the timing/balance belts changed. I now have a vibration that increases with RPMs.
The mechanic is claiming that it is a bad flywheel, but the vib was not there before the belt change. I'm thinking the balance shafts were not aligned correctly. In the words of Bill O'Riely, "What say you".
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S. Herald NASA Engineer 1988 924S Bought as a fix-up and sell, but fell in love. |
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10-12-2005, 02:19 AM
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Join Date: Feb 2000
Location: Kingsport, TN
Posts: 2,935
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I imagine it is the timing belt. I do mine myself. Every now and then I'll misalign one - usually the lower one. It is not hard to do. There are marks on the plastic housing of the belt cover that should line up with a notch on each shaft drive pulley when the engine is at TDC.
Vibration is a high frequency one - twice engine speed.
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Lawrence 1986 951 2002 SLK32 AMG 1987 328GTS 2011 528i |
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10-12-2005, 03:12 AM
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Just thinking out loud
Join Date: Nov 2001
Location: Close by
Posts: 6,885
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I'm pretty sure Lawrence meant the balance belt. The shafts probably are not aligned correctly. Remove the belt cover(s) both upper and lower, set the engine to TDC and check the marks as suggested.
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83 944 91 FJ80 84 Ram Charger (now gone) |
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10-12-2005, 07:01 AM
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Join Date: Feb 2000
Location: Kingsport, TN
Posts: 2,935
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Yes, I did not type what I meant. It's the balance shaft belt. Sorry about that.
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Lawrence 1986 951 2002 SLK32 AMG 1987 328GTS 2011 528i |
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10-12-2005, 07:05 AM
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Join Date: Nov 2001
Location: Melbourne, Florida
Posts: 431
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Where any front balance shaft seals replaced? if so, your mechanic may ahve gotten a pulley installed on the wrong keyslot.
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1986 951 |
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10-12-2005, 07:42 AM
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Join Date: Sep 2005
Location: Huntsville, AL
Posts: 28
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No, no seals just the belts.
The mechanic is going to check balance shafts when it goes back tomorrow. I fragged the clutch this weekend. You know I had her up to 130 mph and just knew she had 140 in her. Well she probably did but the rubber donut didn't. Ah well, I was wanting to put a spring centered clutch in anyway that donut had 100K miles on it.
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S. Herald NASA Engineer 1988 924S Bought as a fix-up and sell, but fell in love. |
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10-12-2005, 12:01 PM
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