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Old 08-25-2012, 06:27 PM   #1
biglittledog
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Default diagnose my bad engine noise...2.5L DOHC...

Here is the rather nasty noise our 2000 Forester started making when my wife was driving home yesterday. It sounds the same hot or cold and varies with engine speed. Sounds like a T-belt pulley?
The car has 170k and had the belt done back at 90k-ish.

Here is a link to a short video I made so you can hear it at idle...

Please let me know what you think! Any ideas are welcome...
Thx,
Steve in Colorado.
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Old 08-25-2012, 08:57 PM   #2
jetfan2207
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I'm no expert but I'd say either bad pulley OR possibly worn alternator. My first car was an 88 Chevy pick`em up truck that sound similar to that when the alt. was going.
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Old 08-25-2012, 11:28 PM   #3
tylerd4213
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Quote:
Originally Posted by jetfan2207 View Post
I'm no expert but I'd say either bad pulley OR possibly worn alternator. My first car was an 88 Chevy pick`em up truck that sound similar to that when the alt. was going.
The alternator and every other pulley is disconnected in the video, but it could still be the bearing for the crank pulley. Does it get much louder when you rev it?
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Old 08-26-2012, 01:50 AM   #4
STi Guy 69er
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Timing belt idler pulley for sure.
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Old 08-26-2012, 01:56 AM   #5
thefoz98
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i didn't think the 2000 forester's had the DOHC 2.5
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Old 08-26-2012, 09:59 AM   #6
2.5iImpreza
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That is the horrible sound of a timing belt tensioner committing suicide, i just had let go on my 99 Outback 2.5
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Old 08-26-2012, 01:12 PM   #7
bugeyetex
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Pull off the timing cover and belt before your motor goes t!ts up. Play around with the pulleys and i am sure one or more may need replacing. If they make any noise or spin really freely, replace them. If they only spin a couple rotations quietly, they are still good. My guess is either the water pump or the tensioner.
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Old 08-26-2012, 06:27 PM   #8
yarrgh
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yup, sounds like timing belt idler/water pump. test them out.
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Old 08-27-2012, 09:26 PM   #9
geronimo81
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Quote:
Originally Posted by tylerd4213 View Post
The alternator and every other pulley is disconnected in the video, but it could still be the bearing for the crank pulley. Does it get much louder when you rev it?
Crank pulley bearing It doesn't exist afaik
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Old 08-28-2012, 11:03 AM   #10
subi400
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That is bad!!!!!!!!!!

Need to get the crank pulley off and replace all 3 of the timing belt pulleys ASAP! Check the water pump for any small leaks and see if the shaft moves any. If that belt snaps, or it gets out of time by a couple of teeth your engine's heads will need a rebuild.

I know of a site where you can get the good double bearing timing belt pulleys from. I have seen the good ones on ebay as well. DO NOT GET THE SINGLE BEARING PULLEY'S, they are garbage and won't last long, trust me as I need to replace 3 in my car because I had got the cheap ones...
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Old 08-28-2012, 02:25 PM   #11
Mishimoto
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I am with these guys. Looks like you caught it just in time.
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Old 09-01-2012, 11:07 AM   #12
biglittledog
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Smile

Thanks! Thanks! Thanks!
Sorry about the delay getting back to you guys. I opened the timing cover up and everybody was correct! I'm amazed the shot pulley didn't come all the way off (apparently the plastic cover kept the gear from coming all the way off the shaft). We are very lucky it didn't!
*clickable thumbnails and if you click again after it's open, it will get bigger...





I just finished replacing everything after a really thorough cleaning to get all the metal shards out. Also did the water pump while I was in there.
Thanks for all your advice!
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Old 09-01-2012, 11:13 AM   #13
yarrgh
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glad we could help. thx for following up.
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Old 09-04-2012, 04:33 PM   #14
Mishimoto
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Another subie saved by the folks at Nasioc.
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Old 09-06-2012, 08:15 AM   #15
aapstealth
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Quote:
Originally Posted by biglittledog View Post
Thanks! Thanks! Thanks!
Sorry about the delay getting back to you guys. I opened the timing cover up and everybody was correct! I'm amazed the shot pulley didn't come all the way off (apparently the plastic cover kept the gear from coming all the way off the shaft). We are very lucky it didn't!
*clickable thumbnails and if you click again after it's open, it will get bigger...





I just finished replacing everything after a really thorough cleaning to get all the metal shards out. Also did the water pump while I was in there.
Thanks for all your advice!
Holy cow I had a slight noise when I changed mine but wow yours seems to have really given out. That video should be saved or tagged so others can refer back for the sound and problem.
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Old 09-06-2012, 03:58 PM   #16
02darkRS
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I'm assuming 5 days later, you're up and running.... but if not, you might want to look deeper before putting it all back together. Mine went in much the same manner. I can't imagine that this happened without bending valves.

http://www.rs25.com/forums/f13/t4998...verywhere.html
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