Matt,
The problem with welding it up is it being a deep hole. They can't get
inside with the TIG gun. The thing to do is have it tapped to the next larger
size, inch or metric, and have an insert made with the correct threads on the
inside and whatever you tap to on the outside. The 10mm to 8mm inserts might be
commercially available. If you like, in a couple weeks when I get back from
vacation I can make the inserts you need. Finishing the holes with a bottoming
tap so the threads go all the way to the bottom helps but is not vital. Also,
you want coarse threads in the head.
keith williams
In a message dated 5/17/2005 10:31:48 A.M. Pacific Daylight Time,
pete_303@yahoo.com writes:
Hi everyone,
After many years of my roadster being off the road for a very slow going
engine swap I was hoping to have the manifolds back on and be driving it soon
but I've had another setback. One of the manifold studs that had pulled out
before while I was rebuilding the engine (L20b) a few years ago and I tapped a
size larger (10mm from 8mm) has pulled out again. This is the first of three
studs that I oversized because of threads pulling out. I'm planning on
putting in a helicoil and hoping that holds. Does anyone have any advice for
me.
If the helicoil doesn't do it I'm afraid I'll have to take the head off and
have a shop weld shut the holes and re-tap them back to 8mm.
Thanks,
Matt Peterson
'68 1600 (with non-running L20b)
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