what could cause this? Pic inside

[Yao]

 

[Okayplayer]

Looks like you had a pretty good exhaust leak. Maybe a bolt wasn't tightened enough. Or maybe the mating surface on the manifold, or exhaust housing wasn't flat. Or the gasket just failed.

 

[rdomeck]

Maybe that one bolt was tightened down first and then the gasket was moved to put the other bolts in? Doesn't look like a blow out, looks like it was torn.

 

[TRBODSM]

I would also say exhaust leak but it looks like one of those thick metal gaskets. I would use a OEM gasket and OEM bolts and washers(2 washers per bolt) and don't forget the anti-seize. Off the top of my head I believe the bolts are torqued to 48-49 ft/lbs. Never had a problem with that set up.

 

[Yao]

I know, it looks like torn, but it is infact a blowout!!? If a thick metal gasket like that couldn't stand a chance, what makes stock gasket work? I have the stock over size one on there now, but incase I need another if it happens again, what is the part number for the stock bigger hole gasket?

 

[turbowop]

Any gasket will blow out like that if the bolts come loose.

 

[Diego]

ANY gasket will explode with a loose bolt. Here is my old gasket, thankfully I have spares, one of the turbo to mani bolts backed out causing this on mine.

 

[Brunoboy]

Quoting Yao:





this happened to me many times, changed your manifold to turbo bolts and use the washers.

 

[broxma]

There is another really good solution for this. Have the surfaces machined or sanded flat, and don't use a gasket at all. I don't use any gasket on my turbo to manifold flange. If it's smooth enough, you don't need one.

/brox

 

[Andy_S]

I usually face both surfaces and use a piece of .030 stainless sheet as a gasket. No problems yet.

 

[mr.mitsu]

I always use an oiling stone on any machined mating surfaces.

Must be the millwright in me lol