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Anyone advise me where to get a piece of shim material 35 thou thick to make a shim

BlackLightning998

Well Known and Active Forum Website User
VOC Member
Afternoon,

I need a piece of shim material to make a shim 35 thou thick and 2 13/16th (70mm) diameter.

To go behind a crankshaft bearing on a T*****h

Can anyone point me in the right direction please?

Stuart
 

davidd

Well Known and Active Forum Website User
VOC Member
I am certain that someone will point the way to a local source, but I often use the McMaster site to see what is available and to make sure I am using the correct terminology in my searches. I also purchase all my shims from them.

http://www.mcmaster.com/#shims/=hyjrhz

David
 

BlackLightning998

Well Known and Active Forum Website User
VOC Member
How odd is this.....

I went on the McMaster site, I entered my details, I started searching cos it looks like I might find what I need there (thanks David) and got this message returned:

"
Access has been restricted We apologize for the interruption.



To protect product information, we limit search activities on our web site. Your use exceeds typical patterns of our visitors, so we have restricted access.



Your access will be restored in 57 minutes."

All I need is a shim of o/d 70mm and inner diameter 28mm at 35thou to 37thou thick to go behind a bearing on the timing side.....

Ohh well, will look again in 57 minutes lol!!!!

Thanks again
 

aldeburgh

Well Known and Active Forum Website User
Non-VOC Member
Hi Stuart
If you are still having problems finding shim steel try the RS website (not an easy site to navigate....but they definately stock it)
alternatively if you are anywhere near Suffolk pop round to my shed and I can give you some!
regards Paul
 

Jim Richardson

Well Known and Active Forum Website User
VOC Member
I think that the shims fitted to Commandos are the same size, when I needed some I got them from Seymores in Thame ( famous Velocette dealer), not a million miles from you.
My understanding is that they are closing down but are still selling off stock at the moment.

JimR
 

davidd

Well Known and Active Forum Website User
VOC Member
I did a quick search and found that many people have complained about that website. I have never had a problem, but they have some software that thinks you are a computer trying to steal info. You might try again and save the search to your favorites. It might make friends with you. I hope that some of the above responses gets you what you need. I buy all my timing chest washers from McMaster also, and they are the only easy source or I would give you another. I copied the item below to give you an idea of the standard size shims that would be available commercially. There was no .035" as it jumps from .031" to .047", but there are .025" and .010" available in the same sizes. Left to right: ID, OD, Quant., #, price. Good Luck.



0.031" Thick (±0.0015")
1/4"
3/8"
10
3088A429
4.97
11/32"
13/16"
10
3088A793
4.75
3/8"
5/8"
10
3088A431
3.69
1/2"
3/4"
10
3088A432
3.69
5/8"
1"
10
3088A433
4.83
3/4"
1 1/8"
10
3088A434
5.51
7/8"
1 3/8"
10
3088A435
6.20
1"
1 1/2"
10
3088A436
6.21
1 1/8"
1 5/8"
10
3088A437
6.39
1 1/4"
1 3/4"
10
3088A438
6.40
1 3/8"
1 7/8"
10
3088A439
7.30
1 1/2"
2 1/8"
10
3088A441
7.78
1 3/4"
2 3/4"
10
3088A442
11.09
2"
2 3/4"
10
3088A443
14.20
 

nkt267

Well Known and Active Forum Website User
VOC Member
Do you need to shim the outer ring or the inner ring of the bearing?..John
 

BlackLightning998

Well Known and Active Forum Website User
VOC Member
Do you need to shim the outer ring or the inner ring of the bearing?..John

Hi John, and all.

I'm sorted now I think as I've had an offer to make me one - job sorted.

It is the crankshaft of a 1960 Triumph Bonneville which justifies to the timing side by passing through the bearing into the timing case and then a clamping washer, pinion, pin and nut are fitted to lock it all against the bearing.

When I do that (after having the crank re-built and new bearings) the con rods are not running centre in the bores and it needs a 35 thou shim under the bearing (between the bearing and the crankcase half) to move the whole crankshaft over by 35 thou when locked up and thus centre the con rods in the bores.

The beauty of shimming under the bearing (actually more of a washer/spacer in a way) is that it is not a moving part and simply serves to distance the bearing 35 thou out from the crankase half. Putting a bearing shim on the crankshaft as I had been suggested brings with it the challenge of moving parts.

Interestingly the Triumph books all mentions shimming behind the bearing to get the crankshaft aligned, but having spoken to several long standing Triumph engine builders both unit and pre unit I haven't come across anyone who has bothered to measure or do it yet - they seem to allow the sideways movement on the rods plus the free play of the piston on the gudgeon pin/little end take up the mis-alignment and bolt them together that way.

Seems odd to me (and I'm no engineer) assembling the engine that way with the con rods as much as 35 thou out of central alignment to the bores.

Anyway, that's what I'm planning to do.

Thanks for everyone's interest and suggestions - I think thanks to a member on the South Coast I am sorted now.

Cheers

Stuart
 
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