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Old 08-29-2014, 09:52 PM   #1
cbrkneedrggr
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Join Date: Sep 2011
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Location: Cortland, NY
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2006 WRX STi
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Default STi Clunk Noise / Timing Belt Marks

So ive searched and have not found photos of marks like mine. I was chasing a noise for 2 years when my motor is cold in the winter, it sorta clunks until it warms up. My timing belt cover was hitting the pulleys, but i couldnt figure out why. Tonight I gapped the timing belt guides and the lower one on the passenger side was only around 0.3mm. Had fine rubber dust from the belt in that corner. All others gapped out properly at 1.0mm with no shavings or residue near them.

So i believe I fixed the noise, I wont find out until winter. Question now is should I do the timing belt? I have only 48K on the car.

Heres some pics for reference.
Timing Belt Marks: (This looks like the worst of them)


Super Close Guide:

Normal Guide:
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Old 08-30-2014, 01:37 PM   #2
Vrooom_Psh
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Without a doubt I'd replace the belt
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Old 08-30-2014, 03:36 PM   #3
Uncle Scotty
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Quote:
Originally Posted by Vrooom_Psh View Post
Without a doubt I'd replace the belt


ya THINK???
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Old 08-31-2014, 02:55 AM   #4
shagwag
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I do about 3 timing belt kits a week and have yet to see a belt fail. Belts have had literally chords showing and chunks missing like a dog took a bite and they still never skipped or failed. 99% of the time the problem with the timing gear is either the cog idler blows up or the tiny idler next to the tensioner.

Ive also seen chunks like this missing when a tiny piece of plastic or something foreign gets stuck to one of the idlers, there is rust on one, or someone has used pliers on the main pulley to turn the crank and damaged the teeth. so check the idlers first, they should be quiet and not sound like dry bearings in skateboard wheels. the belt will survive with those nicks, but of course replacing it would be the safe route.
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Old 09-02-2014, 04:41 PM   #5
cbrkneedrggr
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I figured as much to replace it. Ordering a gates kit with new idlers. No blue belt. Also not replacing the water pump. I'll do timing again at 105K and do water pump then. Going to replace my coolant though, it looks like its never been done. Doh!

The marks are from about 25,000 miles of normal driving. Most likely only in the really cold weather when it was rubbing on the guide. Well i fixed the guide now so there will be no more new marks if i drive it this winter. It will most likely sit in its garage now that I have a beater Audi to drive year round.
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Old 09-02-2014, 04:42 PM   #6
cbrkneedrggr
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PS - Is replacing the stock crank timing guide with a Tomei or Cosworth guide worth it? Thinking of getting one of the two...
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Old 09-04-2014, 09:20 PM   #7
cbrkneedrggr
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2006 WRX STi
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Replaced the belt tonight. Waiting til tomorrow to start her up and burp the coolant so i dont piss off the neighbors. Some of the pulleys spun more freely than others and the cogged or geared pulley had a roller-skate noise. Anyways they're all new too. I re-used the stock timing guide, It was not rubbing at all on it. Respaced all guides to 1.03mm using three business cards stacked together. (Checked with a digital caliper.) The surfaces of all pulleys and gears looked perfect. So if it wasnt the close corner guide then i dont know what it is. Ill keep an eye on it closely for the next few thousand miles.

BTW - This was sooooo much easier than my Audi. I didn't even have to take off the whole front of the car! Was done in about 3.5 hours vs 10 hours for the Audi.
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Old 09-04-2014, 09:50 PM   #8
Loadblaster17
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looks good
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