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'93 Jackaroo clutch bleeding?
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'93 Jackaroo clutch bleeding?
I have just replaced the clutch and master cylinder in a 1992 3.2 V6 jackaroo/trooper. the clutch went in fine, the pull out bearing is attached to the clutch fingers, but despite bleeding over a litre of brake fluid through this thing, and no apparent bubbles out of the bleeder, it has hardly any pedal, and hardly disengages.
so far I have: pushed the actuating cylinder piston right back as far as it will go to minimise the volume in the actuating cylinder, and held it there with a block of wood, then forced the fluid through the system with compressed air at 20psi applied to the top of the reservoir, then performed a regular "bleeding" procedure, with an assistant pumping the pedal while I watched the bleeder tube and worked the bleeder valve. This combination released a lot of air from the system but it appears there must be a lot more in there still :(
I do not have a manual for this vehicle; I have set up the pushrod with approx 5mm pedal freeplay, and there are no leaks around the slave cylinder. the cylinder pushrod does not appear to be adjustable although giving it some length would probably solve (or at least mask) the problem.
any help greatly appreciated.
cheers
Brian
so far I have: pushed the actuating cylinder piston right back as far as it will go to minimise the volume in the actuating cylinder, and held it there with a block of wood, then forced the fluid through the system with compressed air at 20psi applied to the top of the reservoir, then performed a regular "bleeding" procedure, with an assistant pumping the pedal while I watched the bleeder tube and worked the bleeder valve. This combination released a lot of air from the system but it appears there must be a lot more in there still :(
I do not have a manual for this vehicle; I have set up the pushrod with approx 5mm pedal freeplay, and there are no leaks around the slave cylinder. the cylinder pushrod does not appear to be adjustable although giving it some length would probably solve (or at least mask) the problem.
any help greatly appreciated.
cheers
Brian
Free air locker to the first 20 callers!
ok in addition to the above, I have removed, dismantled, cleaned, inspected and reassembled the slave cylinder, then left it dangling off the banjo bolt on the soft line, with a clamp on it to stop the piston popping out. under these conditions it should be possible to bleed it up to a rock-hard pedal, but I can still get almost no pedal at all. have put about 2 litres of fluid through it, under pressure and just running through. no bubbles. no pedal. please give me some ideas.
Free air locker to the first 20 callers!
Have you tried reverse bleeding? Rig up a bottle full of new fluid higher than the reservoir with a long hose on it that will reach the bleed nipple on the slave cylinder and refill the system from the slave upwards. I would imagine this would float the air out of the master cylider.
You said any ideas. Just a thought and have never done this.
You said any ideas. Just a thought and have never done this.
If you want a spare 60 for bits-
http://carl.outerlimits4x4.com/viewtopic.php?p=1109227#1109227
http://carl.outerlimits4x4.com/viewtopic.php?p=1109227#1109227
berazafi wrote:If your clutch cylinder has a bleading nipple, try that as well
it doesn't, but I cracked the flare nut on the hard line (no mean feat on the V6 with the cylinder installed to the firewall let me tell you) and bled it out there, too.
keep the ideas coming.
at the moment I have set it up with a 2 metre bleeder hose recirculating the fluid from the bleed nipple on the slave cyl back to the top of the master cyl reservoir. the slave cyl is dangling from the soft line, with a clamp on it holding the piston about 80% in, to minimise the volume and create tyhe situation where if all the air is removed, the pedal should be rock hard.
I keep bleeding the fluid around and around and it appears there is always tiny air bubbles in it, almost emulsified, so I have to stop every 20 pumps or so and let the bubbles rise to the surface in the reservoir.
I have tried pressure bleeding to no avail, do you think vacuum bleeding woild work better?
Free air locker to the first 20 callers!
Slyy question, was the clutch the same hieght as the old one. If it is different then the Hyraulics wont have enough stroke to operate it.
What happens when you clamp off the flexible line, does it go rock hard?
What happens when you clamp off the flexible line, does it go rock hard?
Don't ask me, ask them. I'm just runnin for my life myself.
Well they are all following you...
No they ain't, I'm just in front...............
Well they are all following you...
No they ain't, I'm just in front...............
thanks for the ideas guys. it's fixed now - it just took a LOT of bleeding to get sufficient air out of it, and the pedal pushrod needed a little bit of extra length to ensure proper operation.
with the 'recycle' bleed I had set up, it took about 200 - 300 strokes of the pedal to expel all the air. curious.
with the 'recycle' bleed I had set up, it took about 200 - 300 strokes of the pedal to expel all the air. curious.
Free air locker to the first 20 callers!
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