Lotus Elan

castellated nut..

PostPost by: hartley hare » Sun Jan 16, 2011 1:52 am

hi guys ,
quick one here,
can anyone tell me the thread size of top nut of rear suspension strut?

stu..
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PostPost by: andyelan » Sun Jan 16, 2011 10:15 am

Hi Stu

It's 11/16 -16 UNF I believe

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PostPost by: bob_rich » Sun Jan 16, 2011 10:37 am

Hi Stu

have checked an old damper and it does look like 11/16" UNF 16 TPI.
I did wonder if new build dampers such as TTR ones use M18 but that would need confirming. I seem to recall that when I replaced my old dampers with TTR ones that they came with a Nyloc nut that was not the same thread as the old castelleted nut.

perhaps someone else could confirm the thread on some of the new replacement dampers

best of luck

Bob
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PostPost by: andyelan » Sun Jan 16, 2011 11:24 am

Hi There

11/16 -16 unf is for the standard OE Armstrong units. If you have other non original items, be they Spax, TTR or whatever, then the threads could be anything, Koni for example use M16x1.5. Do bear in mind however these are all non-preferred sizes so don't loose the nuts that come with the shocks. If you do then you could have a bit of a hunt finding replacements.

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PostPost by: bcmc33 » Sun Jan 16, 2011 12:41 pm

andyelan wrote:11/16 -16 unf is for the standard OE Armstrong units. If you have other non original items, be they Spax, TTR or whatever, then the threads could be anything, Koni for example use M16x1.5. Do bear in mind however these are all non-preferred sizes so don't loose the nuts that come with the shocks. If you do then you could have a bit of a hunt finding replacements.

Mine were not castellated. The strut insert shaft was slotted and the nut had a drilled hole for a split pin.
Rear Strut Nuts.JPG and

When I replaced the original Armstrong inserts for TTR adjustables I slung them for scrap, but kept the nuts. "Why did I save these nuts?" I ask myself each time I see them in the fastener draw - "just in case someone on .net may need them" is my reply.
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PostPost by: rdssdi » Sun Jan 16, 2011 2:13 pm

Brian

You have proven my suspicion. Restoring cars causes one to speak to one self.

I have had some rather heated discussion.

Bob
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PostPost by: bcmc33 » Sun Jan 16, 2011 3:03 pm

rdssdi wrote:Brian

You have proven my suspicion. Restoring cars causes one to speak to one self.

I have had some rather heated discussion.

Bob

Bob,

It's the inner voice criticism with expletives that bother me most :oops: :roll: :oops:
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PostPost by: john.p.clegg » Sun Jan 16, 2011 5:35 pm

Stu

Not only are they 11/16 16 UNF castellated but they also have a step on them and are listed as Nuts special in the parts book and seem to be unobtainable....let me know if you find any as I could do with a couple..

Thanks

John :wink:
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PostPost by: oldelanman » Sun Jan 16, 2011 6:02 pm

The shoulder is to centralise the damper shaft through the top mount bush. A modern damper insert with a 16mm shaft and a plain nyloc nut needs a sleeve to do this job - not all suppliers provide them !
Rear damper top nut 001.jpg and


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PostPost by: andyelan » Sun Jan 16, 2011 6:06 pm

Hi Everyone

John and Roger are right about the step or spigot which is there to locate the nut, and hence damper rod, centrally in the Lotocone. It is of course possible to machine the 20mm dia x 2.5mm long spigot onto a standard hex nut.

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PostPost by: bcmc33 » Sun Jan 16, 2011 7:04 pm

Clearly my inserts were not original Armstrong units. However, thanks for the reminder, John, mine had collared washers under the nuts - I must still have them somewhere.
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PostPost by: hartley hare » Sun Jan 16, 2011 8:04 pm

ah, didn't know about the step on the nut,thought it was just plain castellated....

this makes it a bit more harder to find, will prob have to machine one to sizes given above..

many thanks, great help...
stu.
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