Exhaust Gasket Replacement for 1985 911

[rotorob]

Can anyone tell me how many bolts are holding the heat exhanger to the muffler and also how many bolts holding the cross-over pipe to the muffler. The flanges are triangular but appear to only have one bolt.

Help! Rob

[ThePointman]

You have two heat exchangers that bolt to the cat converter via direct form the drivers side and a crossover form the passenger side with 6 bolts. Then you have the other end of the cat that bots to the muffler with 3 bolts. I know this because I just put a cat by-pass on my 85 Carrera Coupe.

[rotorob]

Im talking drivers side. The connections b/w the cat converter and the heat exchanger and b/w the cat converter and the crossover. Are you saying all 6 holes are suppose to have bolts? Mine appear to have one bolt and two pegs

[Wil Ferch]

Three bolts per flange....8mm x 40 mm length ( under head).

Thr "pegs" may be remnants of bolts !!

When you replace, use nearly identically sized 5/16" diameter, 1.5" long stainless, 18 pitch, and matching silicon/bronze nuts. Doesn't rust, no galling, and the bolt head ( 1/2" ) is very close to stock 13mm.....you use the same wrench, so not being "metric" is a non-issue.

- Wil

[rotorob]

Thanks Wil. Its beginning to make sense now.