ZF issues

[redneckracerx]

I finally got my ZF in my B2. I replaced the master cyl. and installed a new slave, clutch and flywheel. my issue is I cant shift into gear smoothly. I know they're a pain in the a$$ to bleed but I've tried everything. I bled it normally, I filled the resevior and let it pour out the bleeder, I even pressure bled it, and while I had pressure on it I unbolted the master to make the line the high part so any air would go out the bleeder. IT'S DRIVING ME NUTS! Any help PLEASE!

 

[redneckracerx]

I heard from some people on pirate4x4 that the masters from 83-87 are different bores than the masters from 88-90. Anyone shed some light on this? I got a 87 master and was wondering if going to a 88 would change anything...

 

[rurouni20xx]

thats interesting to know but the first law of hydraulics is pressure is pressure. if you have a 1/2 in piston pushing a quarter inch piston youll use the same amount of pedal to push the 1/4 inch piston as you would a 3/4 inch piston, the pressure in the line and fluid being displaced is the same. you just have more fluid in the larger system than the smaller system. you have one of two problems, air in the line (still) or a defective master cylinder. when bleeding the system you must depress the pedal and pump it and hold pressure, then open the bleeder and push it to the floor, then quickly tighten the bleeder, do not pick up the pedal until the bleeder is closed or you will suck in air. pump, repeat until you have straight fluid, a buddy can help you do this, otherwise there will be air in the system, if you are still unsure have the buddy pump the pedal and hold it, then bust the banjo bolts loose and tighten quickly to disperse any air in the banjo bolt that wont normally bleed. the other option (try this first) get a regular bold that will thread into the slave cylinder, change your banjo bolt out w/ the regular bolt. pump the pedal slowly and carefully (dont pump too hard or fast or youll blow the master cylinder seal!) and see if it builds up, if your pedal gets firm, you have a good master, if your pedal slowly goes to the floor (and not pushing all the fluid past the regular bolt) you have a problem in the master cylinder, either worn out or blown seal, causing an internal leak and not pushing the proper amount of fluid to the slave to actuate the clutch.

 

[redneckracerx]

I've bled the system normally and get nothing but a solid stream of fluid. I have also pressure bled the system and got nothing but fluid. I was told that because the master is on such an angle it can trap air up near the clutch rod, so I unbolted the master while pressure bleeding and tilted up. I got some air out of the line this way, but still have an issue. I can't shift into 1st or reverse with the truck running. After its running, it shifts fine I just cant come to a stop in gear. Saturday I'll be taking my master back to napa and exchanging it for a 88 model. We'll see what happens.

 

[rurouni20xx]

if its a first and reverse issue but the rest of the gears are fine i would start thinking its something in the tranny and not the master but go ahead and see what happens, im interesting to see how this winds up.