740 Turbo Exhaust Leak

My 1986 740 Turbo has an exhaust leak where the manifold connects to
the engine block below the 2nd cylinder from the firewall. On Trips
of at least 100 miles the heat from the leak burns the ignition wire
and causes the lost of this cylinder.

My question: has anyone had this experience and if so how expensive
and extensive is fix?

Car has 95M miles and turbo was replaced at 90M.

 

If none of the bolts are stripped it can be fixed in a couple hours, you
have to replace all four gaskets though, the hardest part is usually getting
the oil feed line off the turbo so you can pull the whole assembly off the
head.

 

Broken studs are more the rule than the exception. Heat all the nuts (3
front pipe, 8 cylinder head) cherry red before removal. If you break a
stud it will really slow you down!

The worst part seems to be that either they used low quality gaskets
when they changed your turbo, or they broke one of the studs on that
cylinder and just ignored it.