m.g.sharp at sympatico.ca
Mon Aug 21 22:03:04 MDT 2017
"Only" somewhat technical packing pieces? Don't under-estimate their
importance. When fully tightened with zero end-float, the "tube" created
around the stub axle created by putting, inner races, spacer, shims, washer
and nut into compression against the hub act as a structural member and take
some of the load off of the stub axle, which is prone to cracking if the
correct procedure is not followed, as we all know.
If I do not have the correct new shim that I need to hand, I will re-use old
ones providing they have not been battered or creased. Also, I try to use
the combination of thickest shims I can to remove end-float. It should not
matter as they are in compression, but I had a crank shim in my BSA Road
Rocket break up once with dire consequences. In that application, the
engineering, in my opinion, is a bit dodgy as the shims were used to set
end-float on the crank, which I seem to recall was 0.002". I had included a
thin shim in the combination and that small amount of movement, at engine
speeds, was enough to pound the thing to pieces. When I rebuild it I worked
out the thickness of shims needed and had a machinist surface grind one
thick shim for me. Not necessary for the Healey wheel bearings, but if any
of you have an A10 ..
From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Simon
Sent: August-21-17 6:49 AM
To: healeys at autox.team.net
Subject: [Healeys] Shims
With reference to front wheel bearing shims, I shall be replacing the
bearings in my MkII's front RHS when winter has set in. (Won't be long!)
Anyhow, I've half a pack of unused shims left and there will be others in
the hub. Is there any reason why I can't reuse some/all of the old ones &/or
mix and match them with some of the new ones?
As I see it, we use the shims to get the correct end float so, provided the
shims' metallurgy(?) was correct in the first place, the old one will still
be good to go??? They're only somewhat technical packing pieces???
As ever, I stand ready to be corrected.
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