Took my 1hz's old Genie headers off yesterday - they have a fair number of weld cracks and pinholes due to rust/age/vibration/etc. all of which couldn't be seen without removing them. To be honest, they are pretty ugly and one of the weld cracks was 1/2 way around at a join where three cylinder pipes merge together.
Only 11 studs were present - one has been broken off for a long time as this pic shows:
pic page
That's the bottom stud position for #4 cylinder. Looks like someone in the past tried to get a broken stud out and broke off a bit of the head casting rendering it useless. Argh. Good thing the motor will be replaced hopefully this year.
Anyway I'm fitting 11 new genuine studs and nuts along with two genuine, manifold gaskets with new Pacemaker headers replacing the now-scrapped Genie's.
I can't track down two pieces of information:
- when fitting new studs to the head what torque do the studs need to be snugged up to in the head? So far I've hand tightened them with a torx E8 socket them snugged them a little more with a small ratchet handle.
- Do I need to use any sort of sealant with the new genuine manifold gaskets? I've given the surfaces on the head a really good clean with a paint scraper, brake cleaner, some sanding blocks, etc. just to make it as good as I can for an original head on a 635 k km motor.
I'm using copper grease on the studs where they go into the head based on lots of recommendations to not use anything else.
Thanks, Craig.
Only 11 studs were present - one has been broken off for a long time as this pic shows:

pic page
That's the bottom stud position for #4 cylinder. Looks like someone in the past tried to get a broken stud out and broke off a bit of the head casting rendering it useless. Argh. Good thing the motor will be replaced hopefully this year.
Anyway I'm fitting 11 new genuine studs and nuts along with two genuine, manifold gaskets with new Pacemaker headers replacing the now-scrapped Genie's.
I can't track down two pieces of information:
- when fitting new studs to the head what torque do the studs need to be snugged up to in the head? So far I've hand tightened them with a torx E8 socket them snugged them a little more with a small ratchet handle.
- Do I need to use any sort of sealant with the new genuine manifold gaskets? I've given the surfaces on the head a really good clean with a paint scraper, brake cleaner, some sanding blocks, etc. just to make it as good as I can for an original head on a 635 k km motor.
I'm using copper grease on the studs where they go into the head based on lots of recommendations to not use anything else.
Thanks, Craig.