<VV> Clutch Pilot Bushing Question

[airvair at earthlink.net]

That's the difference. You're using special "grease", not common axle grease, as was proposed in others' previous posts.

-Mark


----- Original Message ----- 
From: Mark Durham 
To: airvair at earthlink.net
Cc: J R Read_HML; Chris & Bill Strickland; virtualvairs at corvair.org
Sent: 11/23/2009 10:49:29 AM 
Subject: Re: Clutch Pilot Bushing Question


The whole point is that the oillite bushing when warm does weep enough lubricant to prevent fast wear. The high temp lubricant I used is a aircraft quality grease that will still be lubricating when I take the thing apart in 80K miles or so. Its designed use is in high heat magneto bearings on aircraft engines. Oillite bearings come prelubed, also, so they too are designed to last the life of a clutch job and preoiling helps prevent galling on that first startup until the bearing is warm and weeps oil on its own. 
Mark Durham


On Mon, Nov 23, 2009 at 6:30 AM, airvair at earthlink.net <airvair at earthlink.net> wrote:

The reason grease is not recommended is because it clogs the pores of the
oilite bronze bushing. Oilite is designed to weep oil onto the needed
surface, and needs those pores to do so. Grease simply won't flow like oil
will, at any temperature. So greasing an oilite bearing simply defeats the
oilite bearing's purpose.

-Mark

> [Original Message]
> From: J R Read_HML <hmlinc at sbcglobal.net>

> Subject: Re: <VV> Clutch Pilot Bushing Question
>

> I've always been told to use oil, not grease.  Don't know why.  Grease
gets
> to thick in cold weather?
> Later, JR
>
> ----- Original Message -----
> From: "Mark Durham" <62vair at gmail.com>

> Subject: Re: <VV> Clutch Pilot Bushing Question
>

> > Bill, a oillite bushing is prelubed, but yes, you would want to prelube
it
> > with something. I just did my clutch and flywheel in the 62 coupe and
when
> > I
> > replaced the bushing I lubed it with a high temp heavy grease which
stays
> > in
> > place better than oil, but oil will work just fine. Just be careful you
do
> > not put so much in that it slings up on the clutch plate. The bushing
and
> > shaft are turning at the same speed, and only when you are shifting (or
at
> > a
> > stop light with the clutch pushed in) they are at different speeds
where
> > the
> > lubrication is important.
> > I don't have a answer to the other question. I've been working on cars
> > since
> > 1965 and I've only seen oillite bushings in the cranks.
> > Mark Durham
> >

> > On Fri, Nov 20, 2009 at 3:45 PM, Chris & Bill Strickland <
> > lechevrier at earthlink.net> wrote:
> >
> >> I would gather that "all" replacement pilot bushings (except the iron
> >> and roller ones) are the Oilite sintered bronze style, requiring an oil
> >> bath prelube -- were original oem bushings just machined brass?
> >>
> >> Thanks,
> >>
> >> Bill Strickland
> >>