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Brass trunnions!
Posted: Sun Jan 18, 2009 7:55 pm
by WPR678B
Before i get any comments, i am not complaining about the temperature!!
Does anyone know offhand when they changed over from brass trunnions on the MM's to the cast steel one's?
The reason i ask is that i am starting to get all the sub assemblies ready for the lowlight and thought as i have the option i might as well do it right
These are the babies .....<br>
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Posted: Sun Jan 18, 2009 7:58 pm
by alanworland
I didn't know that there were brass (bronze) ones!
Posted: Sun Jan 18, 2009 8:04 pm
by WPR678B
They are few and far between these days i would imagine (whatever they are made of!) but as you will see from the picture they do exist!
I was wondering if there was a date or chassis number they were discontinued at?
The car in question is SMM3048 so quite an early one
Posted: Sun Jan 18, 2009 9:51 pm
by mike.perry
I can't find anything in the parts list or any of my books. I had a brass trunion and passed it on to someone who needed it.
Posted: Sun Jan 18, 2009 11:44 pm
by Onne
My SMM/57192 still has both brass trunnions
And that is quite a late one (registered 06/12/1950)
Posted: Sun Jan 18, 2009 11:46 pm
by DAVIDMCCULLOUGH
Mines May 1950 and doesnt have brass trunnions, though obviously could have been changed at some point. I have an early MM parts book somewhere, if I can find it it may be listed.
Are the brass ones threaded? I read of a change in Paul Skilleters book to a threaded link, but it doesnt give a date.
Posted: Sun Jan 18, 2009 11:59 pm
by Onne
Please bear in mind that my car was built up in Holland, so I don't know whether that affects anything...
Posted: Mon Jan 19, 2009 11:16 am
by Judge
OJO, first registered January 1950, has them.
Posted: Mon Jan 19, 2009 6:57 pm
by Onne
On my lowlight
Posted: Mon Jan 19, 2009 7:29 pm
by WPR678B
Ok, thanks for the input!
I thought that they were only on the really early one's but i guess not so they would be fine on 3048
Posted: Mon Jan 19, 2009 9:19 pm
by mike.perry
I'm surprised that they were available so late, I thought that only the very early cars had them.
Do they wear as well as the later trunnions?
Posted: Mon Jan 19, 2009 11:26 pm
by alanworland
I would have thought they would last longer as it considered good engineering practice for a 'bearing' to use dissimilar materials - hence bronze bushes on hardened shafts.
At least if the trunnion assembly wears it is less likely to effect the swivel.
Posted: Tue Jan 20, 2009 12:12 pm
by Judge
Well I think mine are the originals.
Posted: Tue Jan 20, 2009 10:56 pm
by Onne
I think mine are too
None of us here were really old enough (no denying anyone!) to remember when the brass trunnions were still available.
My parents weren't even born for that matter.. or my grandparents married!