Skip to main content
Topic: Bob log, odd exhaust leak, help needed (Read 1017 times) previous topic - next topic

Bob log, odd exhaust leak, help needed

I need help on my 1988 Turbo Coupe.

I just put on my nice new Bob's Log, and I have an exhaust leak...

One the cylinder head, just below the exhaust ports, there are holes that go through to the exhaust port. The holes are about 1/2" in diameter. The log does not cover these hole sufficiently to ensure they do not leak.

I am guessing that these hole should be plugged, but how?

Shiny Side Up!
Bill
"as if 'religion' were something God invented, and not His statement to us of certain quite unalterable facts about His own nature." -C.S. Lewis

Bob log, odd exhaust leak, help needed

Reply #1
If I recall, I tapped mine for 5/16-18 threads and ran a bolt into it and cut if off smooth.
Long live the 4-eyes!  - '83 Tbird Turbo - '85 Marquis LTS - '86 LTD Wagon

Bob log, odd exhaust leak, help needed

Reply #2
Quote from: Chuck W;326745
If I recall, I tapped mine for 5/16-18 threads and ran a bolt into it and cut if off smooth.


I tapped all four to 1/8NPT and made steel plugs for them... all is quiet now!

Apparently, the head on my car is not a Turbo Coupe head, rather it is from a N/A engine.

Shiny Side Up!
Bill
"as if 'religion' were something God invented, and not His statement to us of certain quite unalterable facts about His own nature." -C.S. Lewis

Bob log, odd exhaust leak, help needed

Reply #3
5/16 set screw, they will dissapere up in the hole and you will not have to grind any thing
1985 TC (yet another one) Fully loaded
has 225k mile  still with the factory head gasket






84  Turbo ranger  Daily driver  ($800.00 Ebay deal)
          volvo FMIC and more getto rigging than the law should allow