Jack Rabbit scuffing

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Mopar_man
Posts: 1093
Joined: Sat Jan 12, 2019 9:24 pm
First Name: Robert
Last Name: Govoni
* REQUIRED* Type and Year of Model Ts owned: 1926 Touring
Location: Fredericksburg, VA
MTFCA Number: 32331
Board Member Since: 2016

Jack Rabbit scuffing

Post by Mopar_man » Sat Jan 16, 2021 8:05 pm

So I'm installing a JackRabbit Clutch in my 26. The directions say to scuff up the large metal disks with sandpaper so they are not smooth (I bought new large disks). My question is how much should I scuff them? Also How far from the top should I stack them? The directions say start with a large one then a Jack Rabbit one and alternate until you have a large steel one on top. Is there supposed to be a measurement from the top large disk to the top of where the bolts hold on the clutch plate?


Alan Long
Posts: 381
Joined: Tue Jan 08, 2019 2:33 am
First Name: Alan
Last Name: Long
* REQUIRED* Type and Year of Model Ts owned: 1910 Canadian Touring Car and 1926 Australian built Utility
Location: Western Australia

Re: Jack Rabbit scuffing

Post by Alan Long » Sat Jan 16, 2021 8:23 pm

Robert,
Used outer / metal plates need to be “deglazed” to give the best operation once reinstalled. Just give them a light
rub on both sides till the shiny glazing is gone. I rub mine across the plate both sides (but not in a circular motion)
It’s a similar process that you do on Brake Drums and Cylinder Bores to prevent grabbing

Generally, new plates are supplied ready to go and don’t need roughing up but sometimes I do give them a light rub.
Just the way I do it!
Alan in Western Australia

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Topic author
Mopar_man
Posts: 1093
Joined: Sat Jan 12, 2019 9:24 pm
First Name: Robert
Last Name: Govoni
* REQUIRED* Type and Year of Model Ts owned: 1926 Touring
Location: Fredericksburg, VA
MTFCA Number: 32331
Board Member Since: 2016

Re: Jack Rabbit scuffing

Post by Mopar_man » Sat Jan 16, 2021 11:09 pm

I'll give them a little rub. The new ones I have are real smooth and seem to have a coating on them. Thanks!!

User avatar

Topic author
Mopar_man
Posts: 1093
Joined: Sat Jan 12, 2019 9:24 pm
First Name: Robert
Last Name: Govoni
* REQUIRED* Type and Year of Model Ts owned: 1926 Touring
Location: Fredericksburg, VA
MTFCA Number: 32331
Board Member Since: 2016

Re: Jack Rabbit scuffing

Post by Mopar_man » Sun Jan 17, 2021 11:21 am

Anyone have an answer for the other question?

"Also How far from the top should I stack them? The directions say start with a large one then a Jack Rabbit one and alternate until you have a large steel one on top. Is there supposed to be a measurement from the top large disk to the top of where the bolts hold on the clutch plate?"

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