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Registered
Join Date: Mar 2005
Location: Ellington, Ct
Posts: 132
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balance belt
Have leaks in front of engine. Pulled everything apart to get at front end, not fun. I noticed the balance belt pully is one tooth off from the proper index. Will this cause the vibration ar 3800 RPM's?
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1985/2 - 944 Good ten foot car |
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10-23-2010, 11:33 AM
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Proprietoristicly Refined
Join Date: Jul 2001
Location: ~Carefree Highway~
Posts: 5,833
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Usually not. But fix it.
The real reason for vibration is usually the BB (balance belt) pullys are installed wrong. Here is the correct pully installation. Note the dark spot on the top of shaft is the keyway. Note the "O" & "U" pully orientation.  Vibration at 3800 can also be caused by the rubber clutch disc falling apart if you still have it. OR, do you feel the vibration in the center of the car? TT (torque tube/drive axle) bearing failure. GL John
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1988 924S, 85,750K ..+ 1987 924S, 154K DD (+15K est. bad odo) |
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10-23-2010, 12:46 PM
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Registered
Join Date: Jan 2007
Posts: 2,370
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When I bought my 83 944 the prior owner had just paid for a head job after the timing belt broke and I had a vibration at 4k and above. Turns out my timing and balance shafts were a tooth off.
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10-23-2010, 03:19 PM
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Registered
Join Date: Mar 2005
Location: Ellington, Ct
Posts: 132
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Thanks for the info guys. Looking at the balance shaft pullies the marking on mine do not have all the markings. I only have the o and nothing else. No U or notch on the side of the pully. How do I index them?
Thanks
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1985/2 - 944 Good ten foot car |
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10-24-2010, 08:19 AM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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The keyways that are unmarked are the ones to use. The ones marked with a "0", are where the indexing "spikes" on the front guides go into.
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) Last edited by wild man; 10-24-2010 at 09:04 AM.. |
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10-24-2010, 09:02 AM
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unindicted co-conspirator
Join Date: Jul 2007
Location: Fresno, CA
Posts: 1,660
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there is a great write-up on the Arnworx site for balance shaft alignment, look under "my projects"
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'03 996 - sport exhaust, sport seats, M030 sport suspension, stability control, IMS Solution ‘86 928S3 - barn find project car |
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10-24-2010, 12:29 PM
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Back from Beyond
Join Date: Nov 2004
Location: Alberta, Canada
Posts: 2,697
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Dead easy: balance shaft keyways face up, notches on sprockets align with timing marks on belt cover. It really is idiot proof.
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'88 944 Auto - project, kinda '87 944 Auto - died saving my wife '84 944 5SP - crushed under shop roof during snow storm All others GONE! |
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10-25-2010, 09:01 AM
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