1996 850 NA Loud When Cold Topic is solved

PeteB · Post by **PeteB** » 17 Jul 2017, 14:07

I've mentioned this before, and I'll guess that as the metal heats and expands
the crack/leak closes up a bit. Seems to be coming from under the dash or even
a bit lower, hard to tell really.

I just put the car up on car ramps to do the transmission seal, and took a look.
I don't see any carbon traces anywhere. I see the flex pipe and the lower
flange, how does the top side connect?

Header looks okay from what I can see up near the head, etc.

The front end is up real high, anywhere else I should look while it is up?

Suppose that I should start it and listen, bit nervous going under there as it is.

PeteB · Post by **PeteB** » 18 Jul 2017, 06:09

Listened underneath with it running and it seemed to be coming from behind the cat
or perhaps further back. Have to jack up the back of the car and listen/look there.

Post by **850 LPT** » 18 Jul 2017, 10:48

The flange that's connecting the cat to the rest of the exhaust is somewhat of a trouble spot. That's where I had a leak too. Fortunately, it's a fairly easy fix. But since it's kind of in the center of the car you need get it up on all fours.

Good luck, Dirk

PeteB · Post by **PeteB** » 18 Jul 2017, 11:08

Thanks, will check that out.
Did yours turn out to be the gasket or a crack?

Post by **850 LPT** » 18 Jul 2017, 11:56

If I remember right there is a conical spacer between the pipe flanges that was deteriorated. A new one plus new hardware installed with some exhaust sealer putty fixed the problem.

PeteB · Post by **PeteB** » 18 Jul 2017, 21:25

Thanks for the tips! I'll put it up on stands and have a look listen.

PeteB · Post by **PeteB** » 19 Jul 2017, 09:06

Put the rear up on car ramps and you are correct that both ends need to be lifted.

There is a small 3/8" hole in the muffler, otherwise it looks fine. Covering it makes
almost no change in the sound but there is a bit of pressure there so I'm going to
patch by epoxying on an aluminium flashing patch.
The rear joint is very rusty and has just a bit of black carbon showing, going to cut
the bolts with a dremel and take a closer look. The clamp with bolts is $6 at FCP
so I'm going to buy one when I pass by FCP today.

The whole system looks pretty solid but I bet that those pipes are rusted at that slip
on joint.

PeteB · Post by **PeteB** » 26 Jul 2017, 08:22

On closer inspection one of the nuts holding the joint behind the cat was completely
rusted away and the other did not have much left. The pipes are in decent shape,
put the new clamp on and it worked fine. That was easy.

PeteB · Post by **PeteB** » 26 Jul 2017, 08:24

Looking further back the rear most tail pipe hanger bracket is almost ready
to fall off due to rust. Going to look for a replacement on ebay.
The rest of the exhaust system looks to be in very good shape.

Found this on ebay, but also need the bracket bolted to the chassis:

: EX-HANG.jpg (14.31 KiB) Viewed 1415 times

PeteB · Post by **PeteB** » 26 Jul 2017, 08:39

Looks like the bracket is VOLVO (3547625), cheap here:
https://www.myswedishparts.com/oem-part ... 06-3547625

: FRAME-HANG.jpg (57.74 KiB) Viewed 1409 times