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Registered
Join Date: Jun 2007
Location: Carefree, AZ
Posts: 254
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Crankshaft Pulley Weights
I'm thinking of replacing the crankshaft pulley on my 3.2 Carrera but I see it is weighted for balance. Were 3.2 crankshaft pulleys balanced with the crankshaft? If so I don't want to install a pulley that doesn't match. I see lots of pulleys for sale new but the listings don't say anything about if and how they are balanced.
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1985 Carrera Cab "Speedy" |
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01-26-2017, 04:49 PM
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RETIRED
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AFIK they are balanced as a single part. Like a wheel and tire combo, then installed, silly to balance it to an engine and/r require balancing every time it is replaced....
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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01-27-2017, 07:24 AM
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Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
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Agree with JB. Individually balanced.
I replaced the original dual row pulley on my former '87 Carrera with a brand new single pulley from Porsche and had no issues with imbalance/vibration. If you want to get all you can out of the pulley replacement, why not install an aluminum alloy pulley. Rothsport makes a nice one. Welcome to Rothsport Racing - Engine Products
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Kevin L '86 Carrera "Larry" |
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01-27-2017, 11:12 AM
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Wer bremst verliert
Join Date: Jan 2005
Location: Toronto, Ontario
Posts: 4,767
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Quote:
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2007 911 Turbo - Not a toy 1985 911 Cab - Wife's toy 1982 911 3.2 Indiash Rot Track Supercharged track toy 1978 911 3.0 Lichtbau toy "Gretchen" 1971 911 Targa S backroad toy |
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01-27-2017, 11:17 AM
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Registered
Join Date: Jun 2007
Location: Carefree, AZ
Posts: 254
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Thanks for the input. I almost added the Rothsport 126 mm single pulley to my order yesterday but wasn't sure if I had the correct bolt - mine is the stock 22 mm length bolt holding the stock double pulley.
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1985 Carrera Cab "Speedy" |
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01-28-2017, 08:39 AM
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Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
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If you happen to have the Porsche PET parts diagrams, take a look at the crankshaft diagram and you'll see that pulleys #12 (single pulley for just the fan) and #12A (double pulley for fan and A/C) both use the same bolt #15 that is M12 x 1.5 x 22
Note that this bolt can be a bear to remove. It's got a serrated surface underneath the bolt head and it bites into the pulley surface VERY well. I recall some discussions about this in the past and then the thread was resurrected a few years ago when someone asked about the torque for the Rothsport aluminum pulley install. crank pulley bolt - washer or no washer
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Kevin L '86 Carrera "Larry" |
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01-30-2017, 09:31 AM
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Da cab
