Chris,
I quote British Automotive:
"Before you consider installing aftermarket ball/race type throw out
bearings,
be sure to read the following information. If you have already installed
this type
of bearing, it is doomed to failure. Presently there are two styles of
ball/race
type bearings available:
1.- A black plastic housing type
2.- A steel housing type
Both of these types of bearings suffer from premature "run-dry" conditions
and
their failure is directly related to being in continual contact with the
clutch cover
thrust pad. No.1 will self destruct in a very short time; No.2 will
survive much
longer and failure will not be as catastrophic."
Why would a sealed, permanently lubricated roller bearing designed for
continuous operation with load applied along the axis of rotation, run dry?
Could it be defective? Or damaged during installation? If so, was it returned
to and examined by the manufacturer? If so, might we see their analysis or
reply? If Doug's right, I've been driving several time bombs for the past 15
years. Maybe Doug will share some of his exhaustive test data and methods with
us.
Before I ask Mr. Moss to fly out to Ohio to help me change all these heavy duty
roller bearings back to the original graphite type, I think I need to see some
proof. Thanks in advance for enlightening us.
Senior Doubting Thomas
AKA Jim
1960 MGA
1974 MGB-GT
and a pool of other octagonal delights
Chris Attias wrote:
> Peter C. wrote:
> "A few quick thoughts. Roller bearing or carbon.... don't "ride" the
> clutch. The only time that a clutch can become worn is when your foot is on
> the pedal. If you don't touch the pedal, the clutch wont wear."
>
> This seems to disagree with what I understood about the design of the
> MGB Borg & Beck clutch assembly. See Doug Jackson's write-up on
> clutch bearings @ www site:
> http://www.mgbmga.com/tech/index.html
>
> While I realize Doug has some commercial interest in his development
> of a fix for the problem he finds with roller bearings, he does
> exhaustive research and shares his experimentation and research
> freely...(No commercial interest disclaimer...)
> Chris Attias
> '64 MGB
> '84 Alfa Romeo GTV-6
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