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Top shock mount repair

Technical help for Series one, two and three Lambrettas. Models include the Li, Li Special, TV, SX, GP, Serveta and API/SIL models

Top shock mount repair

Postby Storkfoot » Fri Mar 05, 2021 7:33 pm

Okay, this is a Vega but the same principles will apply :D

The threads towards the end are now beyond repairing with a die. This is an old photo of the mount.

Image

The diameter of the end of the shock mount is only 12mm which doesn’t give too much scope to repair it with a stepped stud of, say, 10mm/12mm.

Any of you any engineering experience of how I can replace or repair the rear shock mount please?
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Re: Top shock mount repair

Postby Warkton Tornado No.1 » Fri Mar 05, 2021 11:40 pm

What is the thread?

If it is, say, M12 x 1.5 (just less than 17 TPI) then you might manage to run a 7/16" BSF (18 TPI) die down it.
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Re: Top shock mount repair

Postby Storkfoot » Sat Mar 06, 2021 10:17 am

M12 x 1.75.
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Re: Top shock mount repair

Postby Warkton Tornado No.1 » Sat Mar 06, 2021 3:48 pm

In that case, 7/16" BSW is close with 14 TPI. However, please check out the technical details before committing :D

If I'm right, a split die is the way to go, gradually increasing the cut to produce a tidy thread. If I had one, I'd lend you a die, but @ £3.25 including P&P:

EBay:271557984130
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Re: Top shock mount repair

Postby Storkfoot » Sat Mar 06, 2021 8:22 pm

Warkton Tornado No.1 wrote:In that case, 7/16" BSW is close with 14 TPI. However, please check out the technical details before committing :D

If I'm right, a split die is the way to go, gradually increasing the cut to produce a tidy thread. If I had one, I'd lend you a die, but @ £3.25 including P&P:

EBay:271557984130


Thanks. I’ll give that some thought.
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Re: Top shock mount repair

Postby Storkfoot » Fri Oct 29, 2021 5:56 pm

Finally, I got round to taking the frame to the engineers. They propose to cut it off and make another longer replacement. When I say longer, I mean more thread as anyone with a Vega will know there are precious few threads visible once you have the shock absorber fitted.

I’ll post a picture when I get it back.
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Re: Top shock mount repair

Postby Storkfoot » Tue Nov 23, 2021 9:36 pm

Image

Just need to dress the end of the thread.
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Re: Top shock mount repair

Postby coaster » Wed Nov 24, 2021 1:36 am

I could very well be wrong but I looked at the shock stud on mine today and I'm fairly sure that the boss is either plastic or hard rubber on mine :?
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Re: Top shock mount repair

Postby Storkfoot » Wed Nov 24, 2021 10:08 am

coaster wrote:I could very well be wrong but I looked at the shock stud on mine today and I'm fairly sure that the boss is either plastic or hard rubber on mine :?


That’s just a plastic cover, mate. It does perform a function though, it keeps the inner bush of the shock absorber from flexing.
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