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Old 06-28-2010, 01:06 PM   #1
Drewbiehd
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Default Flapping sound from engine.

Ok so heres the story. First water pump goes out, got a new one and did a new timing belt as well. Alls good for about a week, then I start hearing this weird noise and it got progressively louder. Now I take off the timing covers to inspect the belt and it seems the crank belt guide as been shredding away my new belt. So I fix the belt guide and give it more clearance. Put on the old belt and its still making the noise from about 2.5 (quiet) - 3k (loud+) RPM. It keeps getting louder from 3k+. Facts:

In neutral no sound throughout the RPM's
2.5k+ rpm Flapping sound starts
Sound only happens when engaged in gear. Every gear.
No performance changes. Still hitting about 15 psi.

Any ideas? I can't figure this out.
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Old 06-28-2010, 01:22 PM   #2
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Quote:
Originally Posted by Drewbiehd View Post
Ok so heres the story. First water pump goes out, got a new one and did a new timing belt as well. Alls good for about a week, then I start hearing this weird noise and it got progressively louder. Now I take off the timing covers to inspect the belt and it seems the crank belt guide as been shredding away my new belt. So I fix the belt guide and give it more clearance. Put on the old belt and its still making the noise from about 2.5 (quiet) - 3k (loud+) RPM. It keeps getting louder from 3k+. Facts:

In neutral no sound throughout the RPM's
2.5k+ rpm Flapping sound starts
Sound only happens when engaged in gear. Every gear.
No performance changes. Still hitting about 15 psi.

Any ideas? I can't figure this out.

Did you also replace your timing belt tensioner?
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Old 06-28-2010, 01:24 PM   #3
Drewbiehd
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I didnt replace it, reused the old one. Thats the thing that you need to clamp down right? The thing with the pin?
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Old 06-28-2010, 02:23 PM   #4
the suicidal eggroll
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Yes that's the tensioner.
How did you compress the old one to reuse it? If you don't compress it correctly you'll ruin it
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Old 06-28-2010, 02:33 PM   #5
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I would remove one of the timing belt covers and inspect the WHOLE timing belt. Odds are a section of it got cut loose and is "flapping". IF this gets UNDER the belt, goodbye valves.
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Old 06-28-2010, 02:52 PM   #6
Drewbiehd
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The belt seems fine. Theres tension. I took it all off to inspect it and I put it all back together and its still doing it. My more mechanically inclined neighbor is gonna be at home around 1 and hes gonna help me check it out. Ill report back after. And if the valves were bad wouldnt the car like not run normally as its doing? All seems fine except for the flapping noise at 2.5k+ rpms
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Old 06-28-2010, 03:11 PM   #7
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Theres no rotational arrows on the belt. If I had the belt on opposite of the rotational arrows what would be the symptoms? Why is it only supposed to go one way?
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Old 06-29-2010, 08:23 PM   #8
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when changing the belt the two cam shaft pulleys on the driver side spin. i saw on a forum saying that they will spin. it also said to spin the top intake clockwise and exhaust counter clockwise to line up the marks. when it happened we didn't notice how much it spun. could it have spun more than once. never saw anything on any forum saying how to determine. it only said which way to turn the cams. it did spin pretty hard when the belt tensioners were takin off. figured if the alignment marks were lined up that should be good. Thanks
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Old 06-30-2010, 10:21 AM   #9
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Originally Posted by Drewbiehd View Post
when changing the belt the two cam shaft pulleys on the driver side spin. i saw on a forum saying that they will spin. it also said to spin the top intake clockwise and exhaust counter clockwise to line up the marks. when it happened we didn't notice how much it spun. could it have spun more than once. never saw anything on any forum saying how to determine. it only said which way to turn the cams. it did spin pretty hard when the belt tensioners were takin off. figured if the alignment marks were lined up that should be good. Thanks
It doesn't matter as long as they're aligned properly. The reason you have to spin them the right direction is because spinning them the wrong direction can cause you to hit one set of valves with the other. Spinning them the correct direction guarantees you won't smack the valves into each other while trying to set the timing.
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Old 06-30-2010, 03:01 PM   #10
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Alright then were good on that. I just need to find out what this sound is and where its coming from. I was looking forever online and came across this thread, however it seems it died with no resolution. http://forums.nasioc.com/forums/show....php?t=2002478 . Any ideas? This guy describes the issue pretty well. Apparently he only changed out his PS/AC belt and it started. Which of course I had to take off to do my timing belt.
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Old 06-30-2010, 03:04 PM   #11
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How did you compress your tensioner when you removed it?

The proper way is to put a clamp on it, tighten up the clamp to compress the tensioner pin, and as as soon as you feel resistance stop. Wait 5 minutes, then go back and tighten it another 1/4 turn or so until you feel resistance again and stop. It's a process that takes a long time, an hour minimum. The tensioner does not really give that much steady-state force, but it has VERY strong damping. This means that it doesn't take much force to compress it, but you need to do it VERY slowly. If you try to compress it too quickly, you'll blow out the dampening mechanism, which basically kills the tensioner.
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Old 06-30-2010, 03:13 PM   #12
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Quote:
Originally Posted by Drewbiehd View Post
Put on the old belt and its still making the noise from about 2.5 (quiet) - 3k (loud+) RPM. It keeps getting louder from 3k+. Facts:

In neutral no sound throughout the RPM's
2.5k+ rpm Flapping sound starts
Sound only happens when engaged in gear. Every gear.
No performance changes. Still hitting about 15 psi.

Any ideas? I can't figure this out.
Does it sound like metal on metal...or clanking? I know you said "flapping", but it's hard to diagnose a noise...ya know.

Just asking because I just had to have my Oil Pickup changed. Sounded off at 2.5k - 3.5k. I heard the noise, but had no time to diagnose it as my car is also my DD....by the end of the week my oil light came on during the time it was in gear and between the 2.5k- 3.5k range and the noise got worse/louder as the rpm's increased.

Last edited by Teehsee; 06-30-2010 at 03:22 PM. Reason: clarity
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Old 06-30-2010, 03:17 PM   #13
the suicidal eggroll
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Originally Posted by Teehsee View Post
Does it sound like metal on metal...or clanking? I know you said "flapping", but it's hard to diagnose a noise...ya know.

Just asking because I just had to have my Oil Pickup changed. Sounded off at 2.5k - 3.5k. I heard the noise, but had no time to diagnose it as my car is also my DD....by the end of the week my oil light came on and the noise got worse/louder as the rpm's increased.
Sounds like you lost a bearing. I hope you did a full engine build along with that oil pickup.
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Old 06-30-2010, 03:36 PM   #14
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Originally Posted by the suicidal eggroll View Post
Sounds like you lost a bearing. I hope you did a full engine build along with that oil pickup.
I didn't. I had the oil pickup removed and a new one installed. Car has been running perfect since. The noise is gone, all tests appeared to be good. Tech at the DS said I was lucky that nothing was seriously damaged. I would assume if something else was damaged, they would want try to milk me for as much as possible.

Although, I had heard of some of the other issues caused regarding the pickup failure, all signs point to lucky.
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Old 06-30-2010, 05:26 PM   #15
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No metal on metal or clanking. Think of it as a baseball card in a bicycle spoke. Umm I used a clamp to tighten the tensioner, it took about 5 minutes or so.... And we did it twice since I had to change the belt twice. Did you check out that guys thread? I have ordered a timing belt kit with all the idlers and tensioner for when I re-do it for the third time, since im using my old timing belt right now.
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Old 07-02-2010, 12:28 AM   #16
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Ok well I guess my sound description is a little off. I took it too a reputable subaru shop and they told me it sounded more like piston slap to them. They told me to keep driving until it gets louder or something else changes... Its just weird that this all started like a week after I change my timing belt. And the sound started off quiet like I could barely hear it then within 20 minutes it started getting really loud.
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Old 03-12-2013, 11:52 PM   #17
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I know this is old but im having a similar sound coming from my engine bay and found that one of the nuts from the driver side belt cover pulled through and the cover was 'flapping'. According to a few techs who heard it and meandered over, it sounded like a bad bearing or terrible piston slap. check your nuts haha
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Old 03-13-2013, 01:43 PM   #18
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Quote:
Originally Posted by boostjuice View Post
I know this is old but im having a similar sound coming from my engine bay and found that one of the nuts from the driver side belt cover pulled through and the cover was 'flapping'. According to a few techs who heard it and meandered over, it sounded like a bad bearing or terrible piston slap. check your nuts haha
Also...check your nuts from time to time too.

Seriously though, any word on the fix?
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