Up-pipe leak

CosbyWood · **Posted:** Mon Apr 02, 2007 12:22 pm

Looks like I've got a sensor in my up-pipe that doesn't want to stay in place. It loosened up a few weeks ago, so I tightened it back into place thinking that it just needed to heat cycle. Then this weekend while at VIR, a nice exhaust leak happened again. The general consensus was that it was the gaskets, but a couple miles from home I remember the sensor and checked it when I pulled in the driveway and confirmed it. Tightened it down again and all was well, until I got to the office this morning as it had loosened up again! :shock:

Any advice as to how to keep it in place? Should I use Lock-Tite, something more permanent, is this common or a fluke? TIA

MarcusMcRae · **Posted:** Mon Apr 02, 2007 1:04 pm

CosbyWood wrote:

Looks like I've got a sensor in my up-pipe that doesn't want to stay in place. It loosened up a few weeks ago, so I tightened it back into place thinking that it just needed to heat cycle. Then this weekend while at VIR, a nice exhaust leak happened again. The general consensus was that it was the gaskets, but a couple miles from home I remember the sensor and checked it when I pulled in the driveway and confirmed it. Tightened it down again and all was well, until I got to the office this morning as it had loosened up again! :shock:

Any advice as to how to keep it in place? Should I use Lock-Tite, something more permanent, is this common or a fluke? TIA

Sounds like the curse of the hideous yellow Subaru to me. :lol:

I think Loctite makes a thread locker specifically for exhaust sensors.

MarcusMcRae · **Posted:** Mon Apr 02, 2007 1:23 pm

How high are the exhaust temps in the up-pipe?

Their high temp thread locker only is good to 450f.

http://www.permatex.com/products/automo ... er_RED.htm

I am gessing you are talking about the stock EGT sensor. Can't you get a EGT sensor delete thingy similar to an O2 sensor delete thingy?

Kevin Allen · **Joined:** Thu Aug 28, 2003 6:42 pm **Posts:** 3479

I already told him to do that when we installed the up-pipe. He's hard-headed. :roll:

CosbyWood · **Posted:** Mon Apr 02, 2007 5:38 pm

The way I looked at it was the piece is already there, it's made to fit that location, why bother finding something else to try and fit in the hole? That and I didn't feel like tracking down the end and disconnecting it too.

Kevin Allen · **Joined:** Thu Aug 28, 2003 6:42 pm **Posts:** 3479

Yeah, it's much easier to deal with it popping out repeatedly. :lol:

MikeWhitney · **Joined:** Wed Aug 20, 2003 9:15 pm **Posts:** 4724

Cos - Do you have a crush washer on it? If not I'd recommend trying to find a copper or aluminium crush washer to fit the EGT. Every O2 sensor I've ever installed has had one, and I would bet that it's missing on your sensor. The crush washer deforms and "holds" the torque better than just steel-on-steel as the temps go up and down.

If it's the same hole size as an O2 sensor you can pilfer a washer from a dead one (ask around) or check an exhaust shop.

Let me know if my guess was right

Arthur McDonald · **Joined:** Fri Aug 29, 2003 1:54 am **Posts:** 2052

Oh thank heaven! I was afraid this was another Google TiSP thread.

Jeb Brookshire · **Posted:** Tue Apr 03, 2007 9:55 am

Cos,

I may have a spare crush washer if you need one. Not that they are that expensive,, but you could stop by and we could put it on.

MikeWhitney · **Joined:** Wed Aug 20, 2003 9:15 pm **Posts:** 4724

Jeb Brookshire wrote:

Cos,

I may have a spare crush washer if you need one. Not that they are that expensive,, but you could stop by and we could put it on.

I was just tinking about this again - most of the O2 crush washers I have seen are two-layer, probaby to get more deformation. Most oil pan crush washers are just a solid washer of copper/aluminium. Do you have new dual-layer crush washers at DT?

Jeb Brookshire · **Posted:** Tue Apr 03, 2007 11:15 am

No I think I have some at home from a past project where I had to change out an o2 sensor.

CosbyWood · **Posted:** Tue Apr 03, 2007 11:26 am

Arthur McDonald wrote:

Oh thank heaven! I was afraid this was another Google TiSP thread.

No, not another TiSP thread.

Mike, thanks for the suggestion. No I don't have one on there, it may have fallen off like you said. I'll see if I can track one down. I'll try Jeb's and go from there. Jeb, you at home today?

Jeb Brookshire · **Posted:** Tue Apr 03, 2007 12:53 pm

CosbyWood wrote:

Arthur McDonald wrote:

Oh thank heaven! I was afraid this was another Google TiSP thread.

No, not another TiSP thread.

Mike, thanks for the suggestion. No I don't have one on there, it may have fallen off like you said. I'll see if I can track one down. I'll try Jeb's and go from there. Jeb, you at home today?

I am. I just went and checked where I thought it was and I guess I used it. It was on a new spark plug anti-fouler that I had, but I have the fouler sans the washer. I guess if you want to pick a couple up on your way home, I can still help you put it on. Sorry for the false alarm!

CosbyWood · **Posted:** Wed Apr 04, 2007 9:33 pm

Ok, so it appears that the crush washer worked!! Thanks to Mike for thinking of it, and thanks to Jeb for having the part that worked! As of right now, I'm leak free and proud of it!

MikeWhitney · **Joined:** Wed Aug 20, 2003 9:15 pm **Posts:** 4724

CosbyWood wrote:

Ok, so it appears that the crush washer worked!! Thanks to Mike for thinking of it, and thanks to Jeb for having the part that worked! As of right now, I'm leak free and proud of it!

Glad I could help!

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Up-pipe leak

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