Egil Kvaleberg wrote:
>
> On Sun, 26 Oct 1997, you wrote:
>
> > The standard job seems to be beadblast everything, clean the
> > rocker shaft, grind shallow oil reliefs in the shaft, then hard-chrome
> > that piece,
>
> But do they handle worn rocker shafts - the chrome surely can't fill the
> void left by average wear.
I didn't ask about their process, but it seems likely they must be doing
this on a production basis, and would take shafts with normal wear and
run them though a centerless grinder to a specific size, then re-chrome
up to standard. Even 0.001-.002" would take care of most ordinary wear
and incidental pits.
I suspect they simply pitch the damaged shafts, since I had two
assemblies--one out of engine which had a minimum of 90K miles, and one
which had lost the shaft setscrew and had chewed the shaft and front
three rockers. They didn't seem much interested in the latter, even
though the former had a couple of rockers frozen to the shaft.
> > re-radius
> > the rocker noses
>
> How does that affect the case hardening? Wouldn't average rocker nose
> wear go through the hardened layer?
I thought about this and looked at the rockers on both sets before I
sent one out. Curiously enough, they don't look worn. Rather, they seem
to be pounded, so if they simply remove material fore and aft of the
contact point, the hardening layer should still be there. That, of
course, depends upon how deep it is, since the whole surface shows
evidence of some grinding.
I simply don't know enough about Triumph production processes--whether
or not the rocker noses were flame- or induction-hardened. If
flame-hardened, I would expect the layer to be only a couple of
thousands thick, in which case, grinding could cause trouble later. If
induction-hardened, the layer could be four or five times as thick.
These guys have been recommended by others, so I'll trust `em for now on
the rocker noses, and keep an eye on wear.
Cheers.
And for those who've asked for the address and phone number:
Rocker Arm Specialist
19841 Hirsch Ct.
Anderson, CA 96007
(530) 378-1075
--
My other Triumph runs, but....
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