1984 nissan 720 clutch issues

[Yankdog]

Alright guys I've put in a new clutch, pressure plate, throw out bearing, master cylinder, slave cylinder, only item not replaced is the dampner. Assume all are installed correctly. Pressure plate was torqued right, can see throw out bearing move on fork against pressure plate. System has been bled. When I start it up and try to put it into gear it grinds and have to really force it into gear. With clutch pedal all the way in there is still friction between clutch disc and flywheel enough that the car wants to move. I need some ideas and suggestions as to what you guys have dealt with. Rock Auto clutch kit. Plate to thick? cant seem to completely disengage this clutch even with slave cyl doing all it can to try to disengage.

[breadbox]

Did you replace the master and slave together? sometimes they are kind of mated size wise, like if your slave is too big for your master it won't push out all the way, likewise if you have a slave too small you can just shoot the push rod out and blow the seal, needing a rebuild kit.


Or try this and get rid of the dampener. <---- then bleed it like brakes.
howto-clutch-damper-bypass-t467425.html

[Yankdog]

The master and slave were replaced together purchased from advanced auto. the issue seems to be that everything is at its full outward stroke and there is still pressure on the clutch plate. This system has been bled several times and the issue is still there. You can look through the opening for the clutch fork and see the throw out bearing touching the fingers on the pressure plate and move them as far as the slave cylinder rod will move it. But it will not completely release the cltch disk from the flywheel

[breadbox]

Yeah thats wierd. Unless your pressure plate is F'd somehow.

[magicman38122]

Could you have possibly put the clutch plate in backwards?

[Tpanda]

The master and slave were replaced together purchased from advanced auto. the issue seems to be that everything is at its full outward stroke and there is still pressure on the clutch plate. This system has been bled several times and the issue is still there. You can look through the opening for the clutch fork and see the throw out bearing touching the fingers on the pressure plate and move them as far as the slave cylinder rod will move it. But it will not completely release the cltch disk from the flywheel

When my truck did this (different circumstance though) the clutch disc was seized to the flywheel. The pressure plate had worn 'flanges' or 'teeth' on one side.

It would go in gear while turned off and if you tried to crank it, the truck would lurch forward. If the truck was running, it would grind in reverse and was impossible to put in any other gear.

Best case is to start disassembly.

[MetalFab]

While looking through the clutch fork opening can you push toward the slave cylinder and make the throw out bearing leave the clutch fingers by any significant amount? It may be that the push rod is too short. While I have not run into this problem in a stock application I have used the stock nissan master/slave cylinders on a saginaw 4 speed behind a built v8 chevisan.. This is the only adjustment to be found in the clutch system that I am aware of. I cut a piece of high tensile rod a bit longer than I thought was necessary and test fitted a half dozen times, grinding a bit off the end each time until it fit perfectly. If you do go this route make sure there is just the slightest bit of play between the throw out bearing and clutch fingers so you do not wear your clutch prematurely.

Nothing is more annoying than completing a clutch replacement (esp on any 4x4 truck) only to find out something is faulty and having to pull it back apart again.

Best of luck.

[Twinpilot001]

havent blead all air out !! Guarenteed! Take a look @ the posts here in the 720 areas as there is fotos & a complete thread on bleading a slaev & master clutch - there is a small part that takes the fluid down to the slave that will hold air - its on pass side on firewall & has a bleeder valve on it. The thread even has pics of it too.

[fastboatman29212]

havent blead all air out !! Guarenteed! Take a look @ the posts here in the 720 areas as there is fotos & a complete thread on bleading a slaev & master clutch - there is a small part that takes the fluid down to the slave that will hold air - its on pass side on firewall & has a bleeder valve on it. The thread even has pics of it too.

Ditto! I agree. Need to bleed the system again.