Soooooo
I am installing the exhaust manifolds today, using the nice little copper coated exhaust nuts from Bel Metric and at the point the self locking threads encounter the stud, the stud just starts turning.
Little effort to pull it out and the stud is clean, no material in the threads.
Now mind you that these heads have just been rebuilt and fixing exhaust studs was on the to do list and the cost was substantial to me.
Then the fireworks went off...
As the great poet Eric Burdon said in the song PC3
"I rattled so long
And rattled so obscene
The ground did shake
And disturbed the Queen..."
This is the motor in my Notchback and it has taken too long to squeeze that puppy in there so this fix is going to be in site.
Is it an optical illusion or are the studs at an angle? ie not perpendicular to the ground?
I ordered some EZLOCK solid inserts and I will make a drill guide that will bolt onto the other stud.
Apologies to the neighbors
@http://www.914world.com/bbs2/index.php?showuser=19266
No picture.
I have a cut off head exchanger end to use as a drill guide if you need it to drill out to a larger size and use an oversize stud.
Sorry to hear that.
Bruce
[quote name='JamesM' date='Jul 5 2020, 11:07 AM' post='2831179' Another option depending on how much meat is left in the bore and if you can find them are the 8mm-10mm step studs. I have used a couple of those in the past with good results.
[/quote]
Those used to be available in 9mm as well. Just found one that was pulled out (threads still full of aluminum) and replaced with a 10mm one.
Those 10mm flange nuts look nice, I may have to try those. One thing about the stock nuts that you won't get with those is the brass threads inside, steel outside. A little anti-seize and they will never get stuck on the studs.
Thanks to Bruce Stone for the exhaust manifold end piece.
At first I drilled it out and used it to guide the drill when drilling into the head. I then drilled it out further and used it to guide the tap. Here is a picture of the insert in place so you can see how big it is relative to the surrounding area. This is on the case side of the head.
So far I have only tightened it with one hand fairly tight but all feel snug so far.
@http://www.914world.com/bbs2/index.php?showuser=19266
' date='Jul 7 2020, 09:27 PM' post='2831927']
Thanks to Bruce Stone for the exhaust manifold end piece.
At first I drilled it out and used it to guide the drill when drilling into the head. I then drilled it out further and used it to guide the tap. Here is a picture of the insert in place so you can see how big it is relative to the surrounding area. This is on the case side of the head.
So far I have only tightened it with one hand fairly tight but all feel snug so far.
[/quote]
Looks good so far.
You going to test it with the jig part first?
The threaded insert needs to in with more torque than the head stud so it wont back out.
I peened the head so it can’t back out. Insert has an epoxy in the threads.
Exhaust manifold went on fine.
All nuts now at 14lbs. On to the next item.
I did that too, I was torquing the bolts down, but did not realize that the torque wrench did not lock, all of a sudden the stud is going round and round.
Looked at the torque setting, it was 200 in/lbs, just a little excessive. LOL
Flange nuts are good, locking flange nuts are not. In a pinch, I've run a tap down locking ones
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