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Old 09-04-2005, 05:42 PM   #1
Zoinks
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Default UP Rattle but no leak / What kind of replacement nut for UP studs?

Two-parter here.

After putting in an uppipe, I'm leak free but I seem to have aquired a rattle. It's noticeable slightly at idle and louder only at sub-1000rpm engine speeds. After that it either goes away or is drowned out. In trying to track it down, I removed the turbo and exhaust manifold heat shields but the rattle is still there.

I noticed that one of the uppipe studs is missing a nut on top. It's the one closest to the passenger side/front of the car - it doesn't connect through the turbo, only through a bracket that the turbo heatshield bolts up to. I figure that's the next most-likely candidate for the rattle. Can anyone tell me what kind of nut those use? I can provide a pic if this is confusing.

Also, if that's not the issue, are there any other common sources of rattling from an uppipe install that I may not have thought of?

Thanks.
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Old 09-04-2005, 10:45 PM   #2
WRXRgr
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I believe it's a M10 1.25, same as the rest of the nuts attaching turbo to UP and DP; you can grab a pack at Advance for a few bucks, Grade 8. They also carry a nice plastic box assortment of metric bolts, nuts & washers, all Grade 8, for twelve bucks or so. That size is in there, as well as a bunch of others you may find yourself needing down the line.

That particular nut connects the upper end of the UP & turbine side of the turbo to a bracket, that connects to the block. Without it, the next hard connection point is about halfway down the DP. It could be the source of your rattle.
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Old 09-05-2005, 07:39 PM   #3
Zoinks
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Thanks!

I picked up some M10 x 1.25 nuts, and that box assortment for next time. Nut did the trick, no more rattle.
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Old 09-05-2005, 08:09 PM   #4
jac04
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You can also pick up the correct flanged nut at the dealership for about $1.00.

Quote:
Originally Posted by WRXRgr
I believe it's a M10 1.25....Grade 8. ....all Grade 8.....
Just to clarify, there is no such thing as a metric Grade 8 fastener.
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Old 09-05-2005, 08:28 PM   #5
Zoinks
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Dealership would have been the next stop, but it's labor day weekend and I'm impatient.

I was able to find a replacement at Pep Boys that was flanged like the OEM ones.
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Old 09-05-2005, 10:42 PM   #6
WRXRgr
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Quote:
Originally Posted by jac04
You can also pick up the correct flanged nut at the dealership for about $1.00.


Just to clarify, there is no such thing as a metric Grade 8 fastener.
You made me walk out to the garage...Class 8, lol.

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Old 09-05-2005, 10:42 PM   #7
WRXRgr
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Quote:
Originally Posted by Zoinks
Thanks!

I picked up some M10 x 1.25 nuts, and that box assortment for next time. Nut did the trick, no more rattle.
Zooper! Nothing like success
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Old 09-06-2005, 07:48 AM   #8
jac04
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Quote:
Originally Posted by WRXRgr
You made me walk out to the garage...Class 8, lol.
Class 8.8, technically.
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