<VV> Re: [fastvair] questions on throwout bearings

[corvairs]

To be honest I'm not sure I recall anyone having a clutch problem that, 
it turned out, was related to using a late t-o bearing with an early 
clutch assy........Now, I DO know of a few where a long early type 
caused slipping in a late assy, however. According to factory specs (and 
what we usually sell) there isn't a great difference in length (height?) 
between 60-63 and 64-69. The 1 7/8 inch length listed in the C catalog 
is MUCH longer than original, BUT will usually work. Anything beyond 
that, however, is too long.

There doesn't seem to be any reason not to use a stock length 60-63 t-o 
bearing except that some manufacturers (notably Precision, Bower and 
Pioneer) kept making them longer and longer and longer......(part number 
consolidation) until they can be too long (We've seen Pioneers that were 
over 2"). Those "extra long" 60-63 bearings MAY work alright in other 
applications but they will not work in Corvairs.

Frankly there is no reason to use a 1960-63 t-o bearing that is longer 
than recommended stock as we (and others) sell the correct length.  Lon

www.corvairunderground.com

bobhelt@aol.com wrote:

>Hi everybody,
>Recently there was someone asking about the lengths of the EM and LM throwout 
>bearings (clutch release bearings). There were some responses and after that 
>I got to thinking. So I measured two LM factory original bearings I have and 
>discovered that there is more to this question than first thought.
>
>The 1964 Shop Manual supplement lists these lengths, but Clark's lists two 
>different lengths in their catalog. To compound the confusion, Ken Hand measured 
>his supply and found two conpletely different lengths. Then I measured my 
>factory supplied bearing lengths and got something different yet. See the table 
>below.
>
>So what is going on?
>
>Well apparently, the bearing lengths don't make much difference. The fork is 
>pivoted on the ball and has the freedom of considerable movement. So as long 
>as the bearing movement allows for it to be retracted from pressure plate 
>contact with the clutch engaged, and also allows sufficient movement to depress the 
>PP fingers about 3/4 inch everything works OK. All of this seems to be 
>accommodated within the adjustment features allowed.
>
>Anybody got any additional information or comments?
>
>                        EM          LM
>
>'64 SM                 1-7/8           1-1/4    
>Clark's                    1-5/16         1-7/32
>Ken Hand             1-7/16         1-5/16
>Bob Helt                 -----           1-11/32 (1966 140 hp)
>                         -----           1-7/32
>
>Regards,
>Bob Helt
>
>
>[Non-text portions of this message have been removed]
>
>
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