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Senior Member
Join Date: Apr 2002
Location: NY
Posts: 1,368
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3.2 crankshft problem, see photo.
Hi all,
Previously I told you my crankshaft pulley bolt loosened and the pulley itself was wobbling. I got a new pulley, pulley bolt and dowel locator pin and as I am getting ready to put it back together I noticed that the dowel hole in the end of the crank is slightly ovaled which allows a very small amount of play when the dowel pin is inserted in the crank. This pin is used to locate the pulley and prevent it from rotating on the crankshaft. Now my question is short of replacing the crankshaft what would be the best way to secure the pin in the crank to prevent any movement of the pin that might cause the pulley to eventually loosen? I've thought of injecting some JB Weld into the hole along with a little piece of wire to solidly shim the pin into the crank. Any other suggestions welcome. In the photo the dowel locator hole is seen at the 10 o'clock position on the crankshaft. |
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07-20-2002, 09:09 PM
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Moderator
Join Date: Dec 2001
Posts: 9,569
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Crank Pulley Wobble
JC: As soon as you got a 993, your 911 got jealous and did this.
 I like the JB weld idea, but if you really want to overkill the fix, I would have somebody with a lathe machine a pin to fit slightly oversize, then throw the pin in the freezer and heat the crank with a blowtorch or heat gun, to get it to expand, then mate the two pieces with a big hammer and a drift pin. Kinda like the way you join a flywheel ring gear. Hey, I saw Coburn today at the vintage rallye (finished 25th out of 50 cars, a clear indication that math will always triumph over brute horsepower - we did the rally in my pal's new 930 (prox 400 hp). He says hi, and mentioned he was flogging a miata at the last AX. I think we need to get the old "P15" crew together just to see who's who again. Good luck! Let me know how it turns out.
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'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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07-20-2002, 09:23 PM
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Senior Member
Join Date: Apr 2002
Location: NY
Posts: 1,368
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Hey John, thanks for the idea. Hope to see you on the track soon. I didn't see your name listed in the Gingerman race.
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07-20-2002, 09:37 PM
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Registered
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Any permanent repair will require you to drill the hole slightly oversize to bring the hole into round.
After that operation...machine a stepped pin to fill the hole and the smaller end will be the original size to accomodate the pulley. Bob
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Bob Hutson |
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07-21-2002, 08:29 AM
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Harley
