3.0 engine rattle

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3.0 engine rattle

Postby b120ute » Tue Jan 08, 2013 7:57 pm

i have a 3.0 my08 wagon with 87,000km on it and it has an annoying rattle coming from what sounds like the front of the engine which can only be heard
on idle when standing outside the car.

ive just replaced the bearings in both idler and tensioner pulleys as i thought they were the culprit but the noise is still there.

ive noticed that is doesnt rattle on cold start up but once warm its pretty noisy, although im unsure if its the fact that its cold that its not rattling
or because of the extra engine rpm on cold start.

im the second owner (bought it a month ago) and it has always been dealer serviced since new

any help/thoughts appreciated
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Re: 3.0 engine rattle

Postby dock » Sun Jan 13, 2013 7:39 pm

Timing chain - mine does it too. My mechanic reckons it is nothing to worry about. But he could be wrong.
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Re: 3.0 engine rattle

Postby b120ute » Tue Jan 15, 2013 3:22 pm

really? if its the timing chain i'd definately be worried about why its so noisy

anyone else have any experience with this?
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Re: 3.0 engine rattle

Postby B8ZE » Mon Jan 21, 2013 10:18 am

I have the same issue except mine is noticeable accelerating hard when the car is about to change gears. I think one of the chain tensioners might be on the way out or gone already. Seems to be a fairly common on H6 Outbacks Google tells me.
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Re: 3.0 engine rattle

Postby Statts » Mon Jan 21, 2013 12:16 pm

I get a quick rattle when punching the accelerator hard, or when throttling back on hard after a gear change. Sounds like pinging but stops quickly, Learning View shows no knocking.
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Re: 3.0 engine rattle

Postby BATMAN87 » Mon Jan 21, 2013 1:36 pm

i get the same rattle too, when I step on it, sounds like there is a small piece in the exhaust pipe smacking around, could it be a piece broken off the 1st cat, and now trapped between the 3rd cat?
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Re: 3.0 engine rattle

Postby cooki_monsta » Sat Feb 02, 2013 10:38 am

It's most likely the exhaust heat shield. I've tried to remove some of the rusted bolts and failed, but in trying to do so, I've slightly bent the heat shields and it has reduced the vibration. I'm going to try and remove it completely today.
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Re: 3.0 engine rattle

Postby jay.ritchie » Mon Feb 04, 2013 8:16 am

dock wrote:Timing chain - mine does it too. My mechanic reckons it is nothing to worry about. But he could be wrong.


Same here.
I haven't asked anyone about it but its going in for a service soon so ill get subaru to look at it.
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Re: 3.0 engine rattle

Postby b120ute » Mon Feb 04, 2013 6:47 pm

report back and let us know how it goes, i suspect timing chain on mine too
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Re: 3.0 engine rattle

Postby jay.ritchie » Tue Feb 05, 2013 10:02 pm

b120ute wrote:report back and let us know how it goes, i suspect timing chain on mine too


I have a post asking about this too. Heres a video:

http://www.youtube.com/watch?v=ljDu20Ci ... e=youtu.be

Does yours sound like this??
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Re: 3.0 engine rattle

Postby cooki_monsta » Tue Feb 05, 2013 10:28 pm

That's definitely not a heat shield. Good luck.
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Re: 3.0 engine rattle

Postby jay.ritchie » Wed Feb 06, 2013 9:42 am

Subaru Melbourne said to book it in for a diagnosis for $80
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Re: 3.0 engine rattle

Postby b120ute » Wed Feb 06, 2013 7:58 pm

no mine doesnt sound like that at all

yours seems to be a consistent sound

mine is more a rattle that doesnt match the rhythm of the engine, if that makes sense
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Re: 3.0 engine rattle

Postby B8ZE » Fri Feb 08, 2013 3:42 pm

jay.ritchie wrote:
b120ute wrote:report back and let us know how it goes, i suspect timing chain on mine too


I have a post asking about this too. Heres a video:

http://www.youtube.com/watch?v=ljDu20Ci ... e=youtu.be

Does yours sound like this??


Nope...mine sounds more like when you change gears on a mountain bike or the sound you get pulling a chain on a roller door but obviously not as loud.

It's gotten worse the last few days no performance loss just annoying :cry:
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Re: 3.0 engine rattle

Postby jay.ritchie » Tue Feb 12, 2013 7:41 pm

I got a mechanic to look at it while my discs were being machined, he said its coming from inside the timing chain cover, so they'll need to take that off to have a better look. He said its nothing to "worry" about, just to get it checked out relatively soon just to be safe.
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