I suspect that the old shafts might have been made from drill rod which is
pretty tough and I think hard-ish.
----- Original Message -----
From: "Joe Boruch" <jaboruch@netzero.com>
To: <N197TR4@cs.com>
Cc: <BillDentin@aol.com>; <WEmery7451@aol.com>; <twakeman@cruzers.com>;
<fot@autox.team.net>
Sent: Wednesday, September 11, 2002 5:48 PM
Subject: Re:Re: Lifter Hardness
> While we are talking hardness, I meaasured some new and old oil pump
> shafts. That is the short shaft that comes off of the rotor. THe new
> stuff is soft at 14 RC. The old ones were 50 and 60 RC (I checked 2
> of them. I did not go the next step to wet grind them and check for
> internal hardness. My suspision is that the old ones are case
> hardened.
>
> Joe(B)
>
> ---------- N197TR4@cs.com writes:
>
> Matching hardness makes sense....gear hardness falls within a fairly
narrow
> band of specification at 58-62 RC.
>
> I wonder also about the depth of hardening (case hardness) on lifters.
>
> Isnt Chuck Gee a metalurgist...Chuck?
>
> Joe (A)
>
>
> > Seems to me, there was also an opinion at the time that part of the
problem
> > involved the fact that to work, all of the pieces needed to be of
similar
> > hardness. One could not be hard and another soft, etc. It was felt
this
> > was
> > a contributing factor.
> >
> > Bill
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