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Shim material
https://www.ausmini.com/forums/viewtopic.php?f=2&t=97367		 Page 1 of 1
Author:  Ian_B [ Thu Jun 14, 2018 8:29 pm ]
Post subject:  Shim material
Repositioned aluminium med rockers for offset exhaust valves.
Do I use aluminium shims or stainless.
I need two more but I chose aluminium Rob suggests stainless and he is a fitter of sorts lol
Ive dremelled little grooves to move the oil feeds inspired by GRs crankshaft and main bearing stuff.
The end two moved outward I need a thin shim and split pin or redrill a hole in a hard shaft.
My mate has tungsten drills
Author:  sgc [ Thu Jun 14, 2018 9:36 pm ]
Post subject:  Re: Shim material
Surely aluminium would compress too easily to be a good shim material...?
Author:  Scoop [ Thu Jun 14, 2018 10:36 pm ]
Post subject:  Re: Shim material
sgc wrote:
Surely aluminium would compress too easily to be a good shim material...?

I would think that too. Bit to soft I reckon.
Author:  simon k [ Fri Jun 15, 2018 3:24 pm ]
Post subject:  Re: Shim material
as far as compressibility goes, there's no real difference... if you could contain water in the area under the rocker pedestal and not have it leak out, it'd be just as compressible as steel - that said, my rocker shims are steel... or am I talking about the wrong shims again? my rocker arm spacers are aluminium, and the shims between the rocker arms and the pedestals are steel

if you really want a scare, I'm about to put a set of these in the back of my Polo - camber and toe adjustment shims - a PLASTIC SHIM with varying thickness that goes BETWEEN the stub axle and the rear suspension beam, it's 2 pieces and one rotates inside the other, line up the marks you want for the adjustment you want and bolt the stub axle back on. The 3 bolts and 1 hole you see in this picture are what mounts the stub axle, which has the wheel bearing, brake caliper mount, everything...

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Author:  sgc [ Fri Jun 15, 2018 5:56 pm ]
Post subject:  Re: Shim material
Hmm.. I seem to remember a discussion about 4 metric yonks ago, about aluminium rocker _posts_ deforming under compression. Maybe I'm getting my wires crossed too.
Author:  simon k [ Fri Jun 15, 2018 7:40 pm ]
Post subject:  Re: Shim material
sgc wrote:
Hmm.. I seem to remember a discussion about 4 metric yonks ago, about aluminium rocker _posts_ deforming under compression. Maybe I'm getting my wires crossed too.


yeah, the aluminium posts deformed, but they're a bit different to a shim that's under compression all the way across
Author:  Ian_B [ Fri Jun 15, 2018 8:55 pm ]
Post subject:  Re: Shim material
Yes guys MED have an answer with LDX offset range It addresses a few issues hmm. :P
Author:  Harley [ Fri Jun 15, 2018 9:20 pm ]
Post subject:  Re: Shim material
Wouldnt strictly have to be aluminium or stainless- normal steel should have a decent life within an oily rocker cover.

As for shims- if it was me I'd go to a bearing shop and buy a proper ground thickness shim- one thats preferably hardened.
Author:  Ian_B [ Sat Jun 16, 2018 5:56 pm ]
Post subject:  Re: Shim material
Thanks all wont be going aluminium .:)
Author:  drmini in aust [ Sun Jun 17, 2018 7:48 am ]
Post subject:  Re: Shim material
Graham Russell and Minis Plus both sell rocker post shims laser cut from ground stock. 2 thicknesses. I used some when putting MED 1.5 rockers on a MK 1 S head.
Author:  Ian_B [ Sun Jun 17, 2018 8:46 am ]
Post subject:  Re: Shim material
Hi Kev Its for the shaft as exhaust valves are offset
Author:  drmini in aust [ Sun Jun 17, 2018 6:39 pm ]
Post subject:  Re: Shim material
Rethinking my post from last night..
The MED rocker shaft is 17mm, not a common diameter but a 16mm flat washer would go close to fitting. I have used bored out flat steel washers to offset smallbore exhaust rockers to a 1275. Worked OK. The whole assembly is well oiled.
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