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Old 07-06-2009, 01:37 PM   #1
cordizzle
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2006 sti
Aspen White

Default crank pulley issues

I have about 105k on my 02 wrx. over the winter I had bad powersteering problems, which was caused by a worn out belt. Now that Ive replaced it, the powersteering it working well, but the car still makes the squealing noise during cold starts. you can also hear a chirping that seems to be coming from the crank pulley. I bought a perrin light weight crank pulley and new a/c belt (a/c is also getting repaired) with the thought that this would fix the problem. Is this a step in the right direction or is this a more serious problem involving the crank? btw: the crank pulley seems to wobble slightly, but i cant confirm that
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Old 07-06-2009, 05:01 PM   #2
kaisersouse
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Your crank pulley is about to fail.

I ran a Bomz aluminum lightweight pulley for a couple years without problems. Then one day I noticed it wobbling slightly.

A week later the car kept running odd, especially when accelerating with a cold engine. Looked at the crank pulley and it was wobbling more, and shaving plastic off teh timing belt cover.

Then one delightful morning in the middle of january...the crank came off.

The steel woodruff key didn't like the aluminum pulley much, and at some point was slowly jumping out of the notch on the pulley, scraping a bit of aluminum off, then getting caught in the notch again. Over time this eventually wore the back of the pulley down and the pulley fell off.

I was halfway to work, but asked my wife to bring me tools. I tightened it and got another 10 miles before it came off again. Did this 2 more times before getting to work, and had to do it twice at night on the way home.

Next day I replaced the key and put the stock pulley back on, but it was too late. From teh beginning the stock pulley was wiggling, and a few weeks later I had to warm my car up for 15 minutes before it was close to being drivable. No acceleration at all...it was infuriating.

Turns out that there is another keyway and gear behind the timing belt cover (or is it inside the block?) and that keyway had expanded because the crankshaft was warped. Gears came off, keyways split open...I officially needed a new crank.

Rather than split the block, I swapped the motor with a used 1996 2.2. Anyone who has put a 1996 2.2 in a 1999 outback sport will know the hell my brother-in-law went through with the wiring.

I now manually control my idle airflow with a pull choke mounted inside the cabin, which connects to a little tube with a tiny orange filter on it. Its quite ghetto but since the idle air control valve on the 96 didnt match the 99 wiring...or is it the other way around...

Long story short...aluminum crank pulleys on these vehicles are a recipe for disaster. You gain next to nothing (except lights that dim and surge when you stop/go) and you are risking some serious internal shenanigans in regards to your engine.

Ditch it and go back to stock before its too late. I am so not joking. You have accessory pulleys that can be lightened up without issue but the crank is balanced as it is and all that steel-on-aluminum foreplay is not going to end well for you.
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Old 07-06-2009, 05:27 PM   #3
cordizzle
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well the good news is that I havent installed the perrin crank pulley yet. Its wobbling with the stock pulley, which is why Im thinking it could simply be a crank issue.
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Old 07-06-2009, 05:29 PM   #4
kaisersouse
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Quote:
Originally Posted by cordizzle View Post
well the good news is that I havent installed the perrin crank pulley yet. Its wobbling with the stock pulley, which is why Im thinking it could simply be a crank issue.
Oh. Well at least now you have time to re-sell the Perrin

Check the outer woodruff key and keyway.
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Old 07-07-2009, 12:16 AM   #5
madmax718
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Easy to figure out , given a few hours
strip the acessories off.

Remove crank pulley

using a gauge with a magnetic base, measure the runout of the crank.

Then you'll know if your crank is crooked.
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Old 07-07-2009, 10:52 AM   #6
cordizzle
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thanks guys! just wanted to see if these other problems that im having could be attributed this potential problem

1. when i do a warm start, my revs will drop hard to 200 rpms or so, almost stalling out (it stalled doing this about 3 times so far).

2. when I come to a stop and throw the b**** in neutral, the revs drop to that same 200 rpm level and the lights go dim for about half a second

Sorry for all of the sudden troubleshooting questions, this has just been bothering me since its been happening for a while now. I feel that I should also mention that the car isnt stock (vf39 with required supporting mods).
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Old 07-08-2009, 09:43 AM   #7
cordizzle
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bump for info
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