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PostPosted: Fri Oct 23, 2020 1:45 pm 
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TBI Slant 6

Joined: Sat Oct 12, 2019 11:42 pm
Posts: 128
Car Model: Rat rod
Hi guys,

I am in the process of building a rat rod and have gotten to the point where I want to hook up a hydraulic system to actuate the throw-out bearing fork. I am planning on using a pull type slave cylinder due to the set up, but could use an explanation on the following items:

1. Does the A833 need a specific level of "throw"? IE the distance the fork needs to move to properly disengage the throw-out bearing from the clutch.


2. Is it important to have a specific size of reservoir, slave cylinder, etc?


I suppose my main point is that I am unsure how the size or volume of the hydraulic system correspond to its ability to move a clutch fork.

Sincerely,

Paul Barrow


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PostPosted: Fri Oct 23, 2020 2:38 pm 
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Turbo EFI
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Joined: Wed Oct 12, 2005 9:00 pm
Posts: 1854
Location: kankakee IL
Car Model: 80 volare, 78 fury 2 dr, 85 D150
As I remember the 86-87 ish stick equipped trucks had a hydro clutch that had that particular trans. Have never worked on one, just (vaguely) remember seeing something about it in the parts books from back then
If you can find a parts blow up or even components from an actual truck from then that has (had?) that setup it might have some clues.
But the clutch disc don't have to move very far at all, when you push that pedal, to do its job with mechanical advantage from the outside of the Bell housing it looks like things get moved father than they actually do.


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PostPosted: Fri Oct 23, 2020 4:58 pm 
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Board Sponsor & SL6 Racer

Joined: Wed Oct 23, 2002 7:57 pm
Posts: 6615
Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
The "master" cylinder on the 85-8?? trucks were a very poor design. The master did not bolt to the firewall at all. It was a turn- lock, plastic unit. Much better ones are available. They were also push to operate the clutch fork/

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PostPosted: Mon Oct 26, 2020 2:51 pm 
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TBI Slant 6

Joined: Sat Oct 12, 2019 11:42 pm
Posts: 128
Car Model: Rat rod
Thanks guys,

I am still doing some research on this, but I am hopeful I don't need some big, special, or expensive piece. My plan is to get some aftermarket stuff off of Amazon and rig up what I need.

Paul


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PostPosted: Tue Oct 27, 2020 6:24 pm 
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Supercharged

Joined: Wed Sep 17, 2008 6:48 pm
Posts: 3186
Location: Indianapolis
Car Model:
attached is a photo of most of the hydraulic clutch working from an 87 D150,,
the clutch cylinder
the reservoir
a portion of the slave cylinder that attaches to the throw out bearing arm,, I should have the missing slave cylinder, somewhere?
these parts should be considered as set up parts, no guarantee that they are suitable for your use or functional.

if this will do you any good, I will send it to you for the shipping cost,
if interested send me a PM


Attachments:
hyd clutch.jpg
hyd clutch.jpg [ 38.27 KiB | Viewed 151 times ]
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