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Old 07-16-2010, 04:26 PM   #1
Scooby Newbie
Member#: 252242
Join Date: Jul 2010
Default Aww crap.

I just have a question about crank shaft pulley and gear. My pulley came loose (thanks to my mechanic i believe) and appears to have destroyed the notch for the woodruff keys on both sides. Does the crank gear come off and is replaceable? Is there anything else that might help? I don't have access to a welder.

crank gear

crank pulley

Would a new woodruff suffice?
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Old 07-18-2010, 09:25 PM   #2
Scooby Newbie
Member#: 129737
Join Date: Oct 2006
Chapter/Region: NWIC
Location: Bend Oregon
04 Sweet Impreza


easy fix, order a new T belt gear, new accessory pulley the timing gear is just pressed on comes off easy
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Old 07-21-2010, 12:56 AM   #3
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Member#: 71092
Join Date: Sep 2004
Chapter/Region: MWSOC
Location: Delaware County, Ohio
2005 2.5RS Wagon
Regal Blue Pearl


You can easily get a new crank pulley (upgrade to a lighter one). The toothed gear is called the crank sprocket. That's a dealer-only part but is something they can get for you. The real issue, here, is what happened to cause the failure (so you can prevent it from happening again) and what is the state of the Woodruf Key (the tab the sprocket and pulley slide onto) and the slot for the key in the crank.

If the key is mangled and trapping the sprocket on the crank, you may have a hell of a time sorting things out. Additionally, if the slot in the crank for the key has been damaged, you'll have to take the engine to the machine shop at the very least and possible the crank is ruined.


1) Order pulley, sprocket, and woodruff key from the dealer
2) Do whatever it takes to get the old sprocket and woodrruff key off the crank
3) Figure out if the crank is salvageable
4) Reassemble if possible
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Old 07-22-2010, 11:48 AM   #4
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Member#: 236927
Join Date: Jan 2010
Chapter/Region: NESIC
Location: Oakville CT
2015 BRZ 93 LEGacy33
1984 BRAT


^^^ When I bought my 1993 Legacy sedan, I took the engine out to do the clutch and whatnot. I noticed that my woodruff key thing was torn to shreds. The crank is replaceable, but if your key is tattered, it is a pain in the a$$ to get it off. I ended up breaking some tabs off of my crank while I was prying it off with a crow bar. While your at it, replace the crank seal too.
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Old 07-22-2010, 01:40 PM   #5
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Member#: 207074
Join Date: Mar 2009
Chapter/Region: BAIC
Location: Sacramento California
2015 STI
You know you're jealous


If your in there doing the timing belt dont forget the water pump.
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Old 07-26-2010, 09:57 AM   #6
Scooby Newbie
Member#: 194581
Join Date: Nov 2008
2002 Imp. Outback Sp

Default what's your question exactly

what's your question exactly? Are you asking if you can replace the pulleys, because that is of course. You can buy new or get a used one at a junk yard. Or are you asking if you can replace the crankshaft? Replacing the crankshaft is a lot more work and $$. Besides, after all those miles, you can't just replace the crankshaft without replacing bearings and breaking in the motor again, I believe. However, you can get another key slot cut on the end of the shaft at a machine shop, so you shouldn't have to replace the crankshaft.

If it were me, I would try just replacing the pulley and key first, and see if that is enough, unless of course the key slot is complete toast. I can't quite tell from the pictures.

Best of luck.
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