| Title: | Musclecars |
| Notice: | Noter Registration - Note 5 |
| Moderator: | KDX200::COOPER |
| Created: | Mon Mar 11 1991 |
| Last Modified: | Mon Jun 02 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 182 |
| Total number of notes: | 5467 |
Got a throwout bearing question for a big block MOPAR. We are in the
process of converting an AUTO to a 4-speed. We now have all the parts
and I'm in the process of making sure that everything appears to
be the proper part before we dig into this big time. Anyway, we picked
up a Hayes clutch, pressure plate, and clutch release bearing for
the beast which is a 23 spline tranny. The release bearing that we got
when slid over the transmissions drive pinion bearing retainer
( where it is suppossed to ride ) is very loose (meaning a good 1/4
inch of slop.) I recently replaced this same bearing on my GTX with
an 18 spline (larger diameter drive pinion bearing retainer) and it
was a nice fit, meaning that there was only several thousands worth
B of slop. I thought that this was how it is supposed to fit. When
the speed shop was questioned on this, we were told that the clutch
fork would insure that the bearing remains centered, not the drive
pinion bearing retainer. Can anybody shed some light on this???
|
`----. <------ drive pinion bearing retainer
|
| .------.
T | | |
R | |______| <--- Clearance between bearing housing and drive pinion
A `------------------. bearing retainer should be 20-30 thousands??
N -------------------------------------.
S main drive pinion shaft |
M -------------------------------------'
I .------------------'
S | |------|
S | | | <---- release bearing
I | `------'
O |
N .----'
|
This is a crude drawing of the drive pinion bearing retainer and the
clutch release bearing that slides over it as the clutch is depressed
and released. I maintain that there should be very little movement in
the up/down axis as shown on this drawing. Clearances more than
20-30 thousands are not correct?
/Dave
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 107.1 | thoughts | CXDOCS::HELMREICH | Tue May 25 1993 13:33 | 31 | |
<<< Note 107.0 by TARKIN::HARTWELL "Dave Hartwell" >>>
-< clutch release bearing question >-
>> When
>> the speed shop was questioned on this, we were told that the clutch
>> fork would insure that the bearing remains centered, not the drive
>> pinion bearing retainer. Can anybody shed some light on this???
Sounds kinda odd - I really doubt that a bearing is supposed to just
float or hover there, kept in line by the clutch fork..... And the fork and
its pivot would have to be very precise in order to do this.
> I maintain that there should be very little movement in the up/down axis
> as shown on this drawing. Clearances more than 20-30 thousands are not
> correct?
I agree - 20-30 is too much. Would it be practical to have a sleeve or
insert machined to take up the gap and leave you with the 6? thousandths that
you should have? Make your spacer with a slight interference fit with respect
to the inside of the t.o. bearing, and press it in. Then you've merely reduced
the bearing I.D. to the size it "should have been." You may have splines or
linkage hangups I'm not aware of, though. OR start poring over catalogs until
you find a throwout bearing that just happens to also fit.
Good luck,
Steve
| |||||
| 107.2 | bearing probs | TROOA::GILES | Wed Jul 14 1993 15:42 | 9 | |
You have the wrong release bearing - I don't care what the speed shop
says!
The release bearing should slide nicely over the retainer snout. The
inner part of the release bearing will have a groove packed with
grease. That's ther so with the slight clearance things still move
nicely. With 1/4' of slop, this would have to be there.
Stan
| |||||
| 107.3 | Done deal | MYCUDA::COE | 440 Rotates the Earth | Thu Jul 15 1993 07:01 | 8 |
Turns out the problem was that Hayes has a problem with the part
number. Yup, it was wrong. I had to call Hayes directly and they gave
me the correct number for N.E. Speed to order. All is well now. In the
FWIW dept, a friend told me a while ago, to avoid Hayes T.O. Bearings.
He said they don't fit right. Now I know why.
/steve
| |||||
| 107.4 | bearing tidbits | TROOA::GILES | Thu Jul 15 1993 14:50 | 17 | |
I seem to recall when I ordered my T.O. bearing (yes, a Hays) that
while I wanted the Hemi one, they only listed one and it didn't say
whether it was the Hemi one or the standard. I made it clear that if it
came in and wasn't right I wasn't taking it. As it so happened, it was
the right one.
As for fit, I'd be willing to bet that there is no difference between a
Hays, Scheifer or any other quality jobber bearing. I can't see all
these guys tooling up, casting these things and manufacturing their
own bearings for the volume of sales they get!
By the way, the casting of the T.O. bearing very seldom wears, usually
only the bearing itself. These bearings are available from auto or
bearing supply houses and replaceable at a fraction of the cost of the
whole unit. This doesn't help you now buts its worth knowing.
Stan
| |||||