Brass trunnions!

Post by **WPR678B** » Sun Jan 18, 2009 7:55 pm

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>

<br>

Post by **alanworland** » Sun Jan 18, 2009 7:58 pm

I didn't know that there were brass (bronze) ones!

Post by **WPR678B** » Sun Jan 18, 2009 8:04 pm

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

Post by **mike.perry** » Sun Jan 18, 2009 9:51 pm

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.

Post by **Onne** » Sun Jan 18, 2009 11:44 pm

My SMM/57192 still has both brass trunnions

And that is quite a late one (registered 06/12/1950)

Post by **DAVIDMCCULLOUGH** » Sun Jan 18, 2009 11:46 pm

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.

Post by **Onne** » Sun Jan 18, 2009 11:59 pm

Please bear in mind that my car was built up in Holland, so I don't know whether that affects anything...

Post by **Judge** » Mon Jan 19, 2009 11:16 am

OJO, first registered January 1950, has them.

Post by **Onne** » Mon Jan 19, 2009 6:57 pm

On my lowlight

Post by **WPR678B** » Mon Jan 19, 2009 7:29 pm

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

Post by **mike.perry** » Mon Jan 19, 2009 9:19 pm

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?

Post by **alanworland** » Mon Jan 19, 2009 11:26 pm

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.

Post by **Judge** » Tue Jan 20, 2009 12:12 pm

Well I think mine are the originals.

Post by **Onne** » Tue Jan 20, 2009 10:56 pm

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!