QUOTE(avidfanjpl @ Aug 9 2010, 05:34 PM)
Took off the Dansk muffler and the SSHE's today. Cylinder 1 and 3 both had a lot of soot around the exhaust pipes, and the copper gaskets looked compromised, and the nuts were loose. Decided to yank everything.
Need to pull 4 of the 8 exhaust studs and replace them all. 4 came out with the nuts.
Have to place an AA order for my parts, then put new 8X8mm studs in, new copper gaskets and new nuts and muffler gaskets. Maybe that will make the noise disappear?
Took it to my mechanic today to have him listen, and he said exhaust leak right off the bat.
The Heat Exchangers are minty. No holes or leaks. Going to hope for the best on this car.
All the exhaust valves looked typical for unleaded premium gas. Sort of a whitish powder on them, but nothing loose. Guides looked OK. Could still be a partially dropped valve seat, but there is absolutely no loss of power, and the flappy sound only came on after the engine was warm.
Up on jacks for a few weeks to come.
Still stumped, but redoing the exhaust mountings is cheap.
Thanks!
John
to detect a failing valve seat, be sure to keep good records of valve adjustments, keep records of the before and after values, that way you can start to see if one particular valve is going bad 9Say it always is tightening up between adjustments) that would indicate a seat coming out for example, or a stretched valve.
so you replaced the copper gaskets and it still is bad?
did you soften the copper gaskets with heat and slow cool first? (they must be annealed to seal right)
inspect teh tops of the exhaust pipes too, there is not much sealing area on the aftermarktet stainless exchangers, a little dent can cause a leak there.
good luck