Questions about exhaust system

[syscrusher]

It's making some noise, seems to be coming from the rear cylinder area maybe although I did T-Bone a car in April and that pushed the front tire into the right front pipe enough to leave a mark on the pipe.

 

Are there copper crush washers that the pipes get snugged up to or what sort of a seal do the pipes have? I could have deformed the seal in the front pipe in the accident.

 

At around 30K miles, where are the first spots that tend to perforate? It looks like a pain to remove the collector and maybe expensive too since I'll probably have to replace several special looking clamps and seals.

 

What sort of seals are there where the rear manifold extenders come together with the "joint" and the joint to the collector? Are there any substitute parts for those?

 

Are there any tips that can be offered to help me sort out how to find and fix the leak? I have taken a good look at all that can be seen without some disassembly.

 

It sounds kind of hardcore but I'd like to quiet it down.

[Prairiehammer]

One of the most common exhaust system failures occur at the juncture of the mild steel nipples and the stainless steel collector. Essentially the nipple rusts and cracks at the weld. The impact very likely stressed an already weak point. It is difficult to see the juncture because of the chrome heat shield. The weld joint is behind the welded on heat shield.

[syscrusher]

So I think you're talking about the part that the fiche calls the "joint" that brings the rear pair of cylinders exhaust into the collector.

It it the nipples on the bottom of that or on the upper rear of the collector?

 

So basically I just need to remove the collector to have a look I suppose?

[Prairiehammer]

Probably not the "joint" (rear header), more likely the stubs or nipples welded to the collector. But anything is possible. There are gaskets at all the points that the various exhaust components attach to each other.

[syscrusher]

Thanks for the picture with arrows and everything!

 

Yeah, I need to take the collector off.

[syscrusher]

Oh, I still wanted to ask, are there copper crush washers where the pipes or transitional manifolds enter the recess into the heads?

[Prairiehammer]

Oh, I still wanted to ask, are there copper crush washers where the pipes or transitional manifolds enter the recess into the heads?

 

Yes, although the gaskets may not be copper. Item number 11 on the fiche. PN. 90430-38054.

http://www.boats.net/parts/detail/yamaha/Y-90430-38054-00.html

http://www.ebay.com/itm/YAMAHA-NOS-NEW-V-MAX-XVZ-TT-XT-SR-XS-VENTURE-EXHAUST-GASKET-90430-38054-OM10-/360966827574

[dna9656]

You're the MAN Kevin!