Hydraulic Requirements

[SmokeShow]

I posted this elsewhere but there's a few of ya here as well so here goes....


Ok, so I'm putting a dmax in the 83 in my sig and have acquired a ZF6 to put behind it. The truck is currently a 4spd. man. trans truck. Will the master cylinder in there be able to operate the ZF6 hydraulicly?? Yes, I understand there's a slim chance the oe lines in the truck will actually hook up to the zf6 slave cyl. but I think I can get new ends or entire new lines (you reading this sweetdiesel? :thumb: ) made that will connect the two properly. I'm not too concerned with the lines.

What I am more concerned with is the capacity of the current system. It was good enough for a dual disc setup behind a hot sbc from when it was a gas puller. I just don't know if that means it'll probably be alright for the zf6 as well or not because I don't know what this system has to offer and I don't know what the ZF6 needs.

Pardon my ignorance but I don't have a real tight grasp on the workings of the whole manual hydraulic clutch system. I think I understand that the MC pushes (hard) on the fluid in the lines when I push in the clutch pedal and I'm guessing the slave cylinder must further increase the "push" on the fluid that ultimately moves something (clutch fork?) that pushes in the fingers on the pressure plate to relieve force on the clutch(es) so it's released. That's the extent of what I know about man. trans./clutches and not even sure any or some of that is correct.

Where can I find some real general/basic hydraulic clutch operation information just so I know.


Thanks in advance.

 

[the4wheeler]

thats kinda the basics simply imagine 2 hydrolic cylinders of the same size linked together one hose connected to the base of each ( we will skip the hole volume/power multiplication factor) one is extend out and one is collapsed in , when you push on the extend one the piston in side the first is pushing on the fluid and since hyd. oil does not compress the forses are transfered threw the hose to the piston of the collapsed cylinder , since the resistances of the collapsed cylinder is less than the extended it moves out as the fist cylinder moves in

cept our ZFs use a hydrolic throwout bearing ( think of a hydrolic cylinder with a hole right down the center of it ) witch pushes directly on the fingers of the pressure plate, instead of a slave cylinder attached to a fork witch is then attached to a regular throw out bearing witch pushes on the fingers of the pressure plate

 

[the4wheeler]

http://www.capetronics.com/basics_of_hydrailics.htm

this page gives some good overviews of hydrolics in general including airia/volume/pressure and how it relates to movement

 

[SmokeShow]

thanks. Yeah, I've been doing some reading and figuring out the logistics of it. Now I'm just having trouble finding specs on stock stuff for both trucks so I can try n see if the fluid displacement of the 83 mc is enough to move the zf6 slave far enough to completely disengage the clutch.

C-ya

 

[duramax3388]

is the master cylinder on the 83 a aftermarket deal or? just always thought that the old body style trucks didnt have any kind of hydraulic clutch system at all thought that they where all manual cables and what not. but i could be wrong have been before lol

 

[SmokeShow]

LOL, I do need to check that but I'm thinking some models had the hydraulic and some mechanical. I don't know the cut off or particulars of when and what had which though and I haven't even looked in mine to see. Guess that would make it real easy to decide what I'm doing if it doesn't have a MC on it all. :joker:


C-ya

 

[Dazedandconfused]

Mitch you sure it isnt a manual clutch? I havent seen a truck older then 86 with hydraulic clutches personally. That is Fords though. I know my 81 is a manual cluth truck.

 

[SmokeShow]

No, I'm not sure of it at all. I kinda assumed it is hydraulic otherwsie wouldn't the pedal stiffness been through the roof if it were mechanical with a heavy plate load dual disc in it? But no, I have not checked it out to be sure. I do know a clutch master cylinder exists for some years of these square body trucks as I've found them for sale in my searching but no specs on the fluid displacement. So even if 83s didn't come with them, the previous owner could have added one from a later model square body so that he could operate his heavy duty clutch. All just speculation til I see what's in there I suppose.


C-ya

 

[Dazedandconfused]

Yeah I know the later years had hydraulic clutches. Really even with a big plate load they arent that bad I dont think. Since he swaped the late 80s early 90s front end on it he could have done the hydraulics. Personally on a dedicated puller I would guess it is still manual. You can ask Sniper on the other forum how they did the blue truck when it was repowered. It had a hydraulic setup and the first model DD if I remember correct.

 

[SmokeShow]

Yeah but he had an nv4500. I spoke with him previously. They've forgotten more details than I know on the conversion. LOL

Cya

 

[duramax3388]

I wasn't sure i just know all the old 70 to early 80 something trucks that i had driven had the old cable clutch and where hard as hell to push in. But i wouldn't think it would be hard to swap something in. Maybe even one out of a zf6 truck who knows stranger things have happened. But i am really looking forward to see how this turns out would like to do one like this someday as well.

 

[SmokeShow]

Thing bout the one in the zf6 trucks is they are a twist lock deal to attach to firewall whereas the old ones bolt on. I'll find a displacement for the oe zf6 mc sometime n then find a comparable bolt on version from like summit or jegs or something.

Cya