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Small leak in exhaust system

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

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GlennG2759
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Small leak in exhaust system

Post by GlennG2759 » Thu Mar 12, 2020 7:28 am

I have a small leak in my exhaust system on my '06 V70. From my experience exhaust manifold leaks are usually associated with a ticking sound, which I don't have, so I think it's in one of the pipe joints. Has anybody ever used the shop vac or leaf blower in the exhaust pipe, while spraying joints with soapy water method. Since I have to get this vehicle up in the air on all fours at least 18" to get myself under thereI only want to do it once, even if it means replacing stuff. Are those stainless steel flex joints before the cat a known problem. 105k miles on car. Any advice appreciated. Thanks Glenn

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Re: Small leak in exhaust system

Post by oragex » Thu Mar 12, 2020 7:43 am

100K miles is a bit early for the flexible downpipe to leak. The other place is at the flange between the catalytic c and the first muffler. It's actually the flange on the cat side that wears at the bottom and starts leaking - so the gasket no longer seals. Only way is to grind to resurface the flange. The studs may need drilled and replaced at this flange, while at the exhaust manifold usually just need removing (and replacing) the 4 nuts.
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Re: Small leak in exhaust system

Post by abscate » Thu Mar 12, 2020 7:44 am

How about some seafoam or Marvel Mystery Oil into the vacuum tree to see if you blow smoke from a joint?

(Wait , that last phrase doesn't look legal yet)

tick tick is usually a blown EM gasket

Throaty roar - loose joint either post cat or the flex joint right after manifold. You can see that one easily of you remove the metal cover for the preheat, and replace those M8 bolts with new ones since they will be rusty
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Re: Small leak in exhaust system

Post by - Pete - » Thu Mar 12, 2020 10:02 am

Like Oragex pointed out, look in that vicinity, but also at the resonator (just rear of the cat/flange). The resonators rot out seemingly more quickly than the remainder of the exhaust. No big deal, just cut it out and replace with 2.5” pipe.

2.5” OD pipe will just slide right over the back of the flange as well as the remainder of the exhaust piping - you will not need any adapters, unless it’s an R exhaust.

The flange, also as Oragex mentioned, in front of the resonator will likely need to have the studs cut off & and holes drilled. If you separate at this joint you’ll need to make or buy a new gasket. I’ve made gaskets out of high temp header gasket material, but you can buy online too. $5-6 from IPD.

https://www.ipdusa.com/products/11920/1 ... 45-9179056

The flange is ferrous so you can weld pipe right to it, but make your cuts on the resonator as close to the ends as possible. The pipe itself is not magnetic, but I was able to MIG the 2.5” parts store exhaust piping right to the SS Volvo pipe.

The bonus is you get a little nicer sound coming out the tailpipe :)
Not louder though.

The hangers towards the rear rot out as well. If they are rotted the exhaust forward from there can sag.
7D883EE4-E028-4D31-B462-C95E31CA5A15.jpeg
7D883EE4-E028-4D31-B462-C95E31CA5A15.jpeg (142.84 KiB) Viewed 120 times


Edit:
I’ve done 3 salt country P2 exhausts & the resonators have all been rotted. The final muffler (right before tailpipe) gets a little flakey on top, but I haven’t seen one rust completely through yet. I have seen photos of completely rotted ones though.

The flex joint Chinese finger trap exterior unravels but the accordion joint is pretty tough. But definitely look closely at it as it does “flex”.

Can you hear an exhaust leak or on cool mornings do you have exhaust steam coming up from before the tailpipe? Just curious how you’ve determined there exists a leak.
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Re: Small leak in exhaust system

Post by GlennG2759 » Thu Mar 12, 2020 12:20 pm

After getting under and looking as close as possible it looks like resonator to cat pipe flanges are rotted pretty good. That also seems where noise is coming from. I like Petes idea if eliminating resonator and replacing with 2.5 pipe. Thanks all for replies, now I just have to get high enough off the ground to work comfortably.

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Re: Small leak in exhaust system

Post by - Pete - » Thu Mar 12, 2020 1:48 pm

I usually start with a 3’ chunk of 2.5” & then cut it down to an appropriate length.
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Re: Small leak in exhaust system

Post by oragex » Thu Mar 12, 2020 3:13 pm

Also gently with those alu heat shields, they rot at the bolts and are very rattle friendly

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Re: Small leak in exhaust system

Post by deano1 » Fri Mar 13, 2020 1:39 pm

Nice Job on the resonator delete job Pete!
Almost exactly what i did and I agree with you 100%,,, exhaust note turns brilliant @ 3000rpm B5244S!
I highly recommend!!
Cheers
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Re: Small leak in exhaust system

Post by - Pete - » Sat Mar 14, 2020 12:34 am

Not applicable to FWD, but another added bonus on top of exhaust note is permanently resolving the potential for rain-squeal.
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Re: Small leak in exhaust system

Post by deano1 » Sat Mar 14, 2020 3:59 pm

Ummm...
What's "rain-squeal"?

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