Throwout bearing engagement angle

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Ottawa_LeMans

Not-quite-so-new-guy
Jul 11, 2021
36
18
Might be showing some newbie stripes with this one...

I am working on the 327 swap / manual conversion again after a week in Nova Scotia visiting family (there is a build thread: https://gbodyforum.com/threads/nostalgia-lemans-327-muncie-swap.82287/)

This afternoon I installed pilot bushing / flywheel / clutch disk / pressure plate on the 327.

I was then mocking up the bellhousing / clutch fork / throwout bearing installation without the transmission so i could see how things fit together.

What I found was about a 1/2 gap between T/O bearing and the pressure plate springs, when the clutch fork is seated properly in the bell housing ball stud.

the throwout bearing will only engage in this case on an angle with the pressure plate spring (i.e. T/O bearing face will not be flush with the pressure plate springs)

I haven't tried installing T/O bearing on transmission first yet, but something looks a bit off to me...

Thanks in advance for any thoughts.

Colin
 

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  • TO bearing gap.JPG
    TO bearing gap.JPG
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buick7332

Master Mechanic
Oct 21, 2014
311
93
N.E. Philadelphia area
Might be showing some newbie stripes with this one...

I am working on the 327 swap / manual conversion again after a week in Nova Scotia visiting family (there is a build thread: https://gbodyforum.com/threads/nostalgia-lemans-327-muncie-swap.82287/)

This afternoon I installed pilot bushing / flywheel / clutch disk / pressure plate on the 327.

I was then mocking up the bellhousing / clutch fork / throwout bearing installation without the transmission so i could see how things fit together.

What I found was about a 1/2 gap between T/O bearing and the pressure plate springs, when the clutch fork is seated properly in the bell housing ball stud.

the throwout bearing will only engage in this case on an angle with the pressure plate spring (i.e. T/O bearing face will not be flush with the pressure plate springs)

I haven't tried installing T/O bearing on transmission first yet, but something looks a bit off to me...

Thanks in advance for any thoughts.

Colin
I don't know if this helps but im 100% sure you have to use a g body clutch fork. I believe the Parts Place Inc. sells a reproduction.
 
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ELCAM

G-Body Guru
Jun 19, 2021
710
93
The throw out bearing slides on the bearing retainer on the front of the transmission that is what will keep it aligned. That groove in the inside of the throw out bearing with the grease in it is what keeps that sliding surface lubricated.

The flats on the front of the fork will be in the center of the bearing when it is installed.
 

Attachments

  • Muncie front bearing retainer.jpg
    Muncie front bearing retainer.jpg
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Ottawa_LeMans

Not-quite-so-new-guy
Thread starter
Jul 11, 2021
36
18
The throw out bearing slides on the bearing retainer on the front of the transmission that is what will keep it aligned. That groove in the inside of the throw out bearing with the grease in it is what keeps that sliding surface lubricated.

The flats on the front of the fork will be in the center of the bearing when it is installed.
Ok that makes sense.

thanks!
 

Ottawa_LeMans

Not-quite-so-new-guy
Thread starter
Jul 11, 2021
36
18
I don't know if this helps but im 100% sure you have to use a g body clutch fork. I believe the Parts Place Inc. sells a reproduction.
Thankfully I've got myself one of those. I think it was a misunderstanding on my part, as ELCAM said it's the bearing retainer on the transmission that determines alignment
 

Ottawa_LeMans

Not-quite-so-new-guy
Thread starter
Jul 11, 2021
36
18
Got the engine + transmission mated yesterday after some effort to properly align the clutch disc with the pilot bushing
 

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    engine+transmission.JPG
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