Hi Randall
That is a very good point and as the replacement shafts are softer than the
original, I think I will go to sintered bronze bushings. Any thoughts about
this alternative?
Cheers.
Graham.
----- Original Message -----
From: Randall <randallyoung@earthlink.net>
To: Graham Stretch <technical-iwnet@lineone.net>
Sent: Sunday, February 06, 2000 5:08 AM
Subject: Re: Rocker shaft
> Graham :
>
> IMO if you convert to needle bearings in your rockers, you will also
> need a harder rocker shaft. Most orginal shafts have very thin surface
> hardening, and the needle bearings will concentrate the force on a very
> small area, causing the surface to 'spall' (flake off due to pressure,
> like chipping flint).
>
> Frankly, my opinion is that the bushings will outlast the needle
> bearings, as long as they get oiled at least occasionally.
>
> Randall
>
> Graham Stretch wrote:
> >
> > Hi John
> > As a rule of thumb it is normally the hard bit that wears the most so a
new
> > shaft will cure more of the problem than new rockers, however the old
> > rockers could do for your shaft PDQ so I would say get the rockers as
well
> > or you could get them bushed out if this will be cheaper by the time you
add
> > shipping, I am looking to do the same job on my PI sedan, but am
thinking of
> > going for some Torrington needle bearings in the rockers as I think they
> > will hold their own supply of oil to cope with those dry / low supply
> > moments. I will be doing the work myself and will probably make a jig up
for
> > boring the holes. does any one out there have any views on this route?
> > Cheers
> > Graham.
> > Ps the theory behind the hard bits wearing first is that bits of hard
embed
> > themselves in the softer material then act as an abrasive on the hard,
> > causing more bits to embed etc etc.
> >
> > ----- Original Message -----
> > From: John Linnerth <jklinn@kw.igs.net>
> > To: <triumphs@autox.team.net>
> > Sent: Saturday, February 05, 2000 6:56 PM
> > Subject: Rocker shaft
> >
> > >
> > > I've got a 76 TR6 with 51K miles on it, have had it for a little over
a
> > year
> > > now, low mileage driver 2-3k per year.
> > > I had the valve cover off to check the valve clearance (and adjust) I
> > > noticed that the rocker shaft had quite a bit of wear near the front
of
> > the
> > > engine. Typical problem from what I can gather.
> > > My question is does the shaft take all the wear or should the rockers
also
> > > be replaced?
> > > I don't have the gages for measuring and if I'm going to order parts I
may
> > > as well get them all at the same time.
> > >
> > >
> > > John Linnerth
> > > Waterloo, Ontario
> > > 76 TR6
> > >
> > >
>
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