Dear Peter,
I assume that when you refer to "oil impregnated" bushings that you are
refering to "oilite" bronze. This is the type of bushing that is used in the
rear of a Lucas generator, for instance. This material is mate for shafts
that rotate rapidly and are not under heavy loading. It is very hard and
quite abrasive, I have been led to understand. It is not made for heavily
loaded parts like a rocker arm, which also have a steady supply of oil. I
suggest that you go back the a standard "bronze" bush material similar to
the original. When used with a hardchromed shaft like the ones that we can
supply, as long as the oil is clean and the is an adequate supply of oil ,
wear will not be a problem.
Regards,
Greg
Solow
----- Original Message -----
From: "Peter Vucinic" <vucinic@b140.aone.net.au>
To: "FOT" <fot@autox.team.net>
Sent: Monday, September 15, 2003 6:07 AM
Subject: TR4 Rocker Shaft Wear
> Gentlemen,
> I am hoping that some one on the list has gone there before me on this
one! I
> am not happy with the wear on my "tuff trided" rocker shaft which is a
MOSS UK
> item. The shaft has 2-3 thou wear over a couple of thousand miles. I can
only
> assume that the shaft is/was hardened. I know oil supply is not an issue
as I
> run an external feed line and the rocker arm bushes are in pretty much
perfect
> condition.
>
> I must admit that my rocker arms do not use the STD bushes. I modified the
> arms to utilise an off the shelf oil impregnated bronze bush and this may
have
> contributed to the wear, as these bushes have slightly more surface area
than
> the STD's. However, I did grind more & deeper oil grooves on the shaft
> directly inline with each rocker bearing. Maybe I needed to machine a
groove
> all the way around shaft which, is one option I am considering for the new
> shaft.
>
> Does anyone have a positive experience with an alternate/different supply
for
> this item? Or does someone have a "better fix" for this problem.
>
> Thanks in advance
>
> Kind Regards
> Peter Vucinic
> WORKS-4
> TR-4
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