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Bolts for gear box cover

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hemm999 Avatar
hemm999 Ian Hemmingway
Manchester, lancs, UK   GBR
Hi all,
Removed the gear box cover today,
All the bolts came out ok except 1,
It just keeps turning, Had to angle grind it off,
Once removed i noticed there were 3 other bolts had
the same problem.
I am now left with 4 threads left in that are loose
but will not come out.
if i try to drill them out it will just spin in side the nut.
Is this common, If so how do i remove the bolt thread.
Many Thanks Ian.

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John in Eugene Avatar
John in Eugene Gold Member John Quilter
Eugene, Oregon, USA   USA
Even though the bolts are brass they often get seized and break the square captive nut away from its retainer on the underside. In some cases you may have access to the captive nut and can order a nut to replace it outside the broken away retainer. (you will need an assistant to hold the nut on the underside while you tighten the bolt on the upper side) It is not a bad idea to order replacement bolts when working on these old cars. Note they come in two different lengths. Some assist in retaining the gearbox cross member. The bolts are available from the usual sources, Bull Motif, ESM, etc. If only a few of the captive nuts are broken away you can still retain the cover adequately with the remaining good ones.

John F. Quilter
Eugene, Oregon USA

hemm999 Avatar
hemm999 Ian Hemmingway
Manchester, lancs, UK   GBR
1 is holding the gearbox cross member,
The other 3 are just to hold the cover,
Will have a better look tomorrow,
Only had 20 mins today due to work.
Thanks Ian.

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pixelsmithusa Avatar
If the cage for the captive nut is intact, simply use some locking jaw pliers to clamp the cage and nut together so it remains stationary. You should then be able to drill off the broken stud with the grips in place, but do your best to get the drill bit centered if you intend to resume the nut. Use a center punch and start with a small drill bit. once you have a centered pilot hole, gradually increase the size so that an EZ-Out can be used to extract the broken piece. Use a penetrating lubricant while drilling, and the heat generated by the bit should aid in making it easier to remove. Judging by the serious amount of rust you have, you may or may not succeed, but worth a try.

Use anti-seize compound on the threads when replacing the screws.

When buying new screws, make sure to get the new dished washers to go along.



Gerard

http://gerardsgarage.com/



Edited 1 time(s). Last edit at 2017-07-12 03:24 PM by pixelsmithusa.

66jalopy Avatar
66jalopy Silver Member Phillip Jolliffe
Lake City, FL, USA   USA
Are the bolts steel? If so someone replaced the brass ones with steel bolts. The original brass ones also are posi drive. Do you have the correct screwdriver, they are not Phillips.

pixelsmithusa Avatar
Yes, you not only want Pozidriv, but the right size as well. These take a PZ3

In reply to # 24823 by 66jalopy Are the bolts steel? If so someone replaced the brass ones with steel bolts. The original brass ones also are posi drive. Do you have the correct screwdriver, they are not Phillips.



Gerard

http://gerardsgarage.com/

0123 Mike D
Biddulp, Staffs, UK   GBR
None of the bolts is structural.
So you can run without them.

If you havn't got easy access
to welding equipment Ian

A used gearbox doofer
is an easy partial solution.

Rivnuts or pop-rivets?

If you have access, a skilled
gas welder should be able to
melt the brass out of the nuts.

And rebuild the cages,

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hemm999 Avatar
hemm999 Ian Hemmingway
Manchester, lancs, UK   GBR
I have a mig welder.
Will look into further.

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