New Zealand Datsun Club

Well i have my mates Hiace van in my driveway.
Its been off the road for about 12 months or so getting a few repairs new gearbox diff etc.

He tried to bleed the clutch on it a month ago and no luck couldn't get fluid to come out the slave, So new master cylinder was ordered but that didn't fix problem,
Next we fitted a new slave cylinder. As old one was full of rust.
Well still no luck got the tinest amount of clutch fork movement but thats it.

Well ive had both the slave and master cylinder off changed back to original master encase new one was faulty. Been through 1L of fluid trying to bleed the dam thing at all points.
Master cylinder.
Pipe into Slave
And Slave bleed screw.

Now heres the thing.

1988 Hiace van.
13BT Rotary Turbo
Clutch master is a Hiace one.
Clutch Slave is one from a Siliva. (i had to match it by picture). (it did have a 19mm bore on there now has a 17mm bore as i can not find out what the original is).

Does anyone out there have any ideas what the hell is going wrong. Ive prob put 6-7 after work hours into this dam clutch and no luck at all. Half the time can't even get any pedal pressure at all.
When you do get a little pressure its only at the very bottom of the pedal travel. The actuator rod moves in at the top of the stroke.
Have fitted new copper washers to inlet on master cylinder can't see any leaks,

Can get full stroke on the master cylinder as i pulled the pedal stop bolt out.

If you take the line off the slave cylinder you can hold your finger over the end of it while pressing the pedal down this to me indicates that its at the master cylinder end????????
But it does bleed well at the master cylinder its self. Blows finger off the outlet anyway.

Its like somewhere between the master and the slave there is some sort of other issue. Its not a leak fluid level doesn't go down.

I know that was probably hard to read.
Any ideas most appreciated. Its a clutch system it really shouldn't be this dam hard!!!!

Brett

Check hat here isn't an intermediate bleed nipple somewhere. My U13 has a nipple halfway along. Unless that's bled first, no juice gets to the slave cyl.

Bleed MS on bench.
Cannot stress that enough

How do you bleed it on bench then fit the thing with out all the go juice from falling out. You have to turn it over 3 times do a double flip then rotate twice just to get the dam thing in there. Well not quite but its not like a convention car where theres lots of room its up under the dash.

Make sure the pushrod length is correct and that the clutch fork returns fully

I'm with you, if the master cyl is bleeding up, but no pressure at slave cyl. with the hose off then fault should be inbetween, is the hose damaged and swelling up?
Can you hold your finger over the hose and bleed the line? before fitting and bleeding the slave.
Have you done the math, does the Master cyl pass enough fluid to give you the travel you require?
Can you get a vacuum?

Ive actually dropt in bore size on the slave compared to what was there and once working correctly.
So if anything should be having an over stroking of the slave cylinder.
Push rod on master gets full travel i removed the stop on the clutch pedal for now.

Im beinging to look into the lines issue there is an area of hard line i can't see but after looking at the piping the rubber line looks pretty old and crappy on outside and the hard line after that down to the pedal looks rugged as. Nothing obvious but maybe issue lies there. Might pull rubber line off inspect that and bend up a tidier secondary metal line to replace the crappy looking one.

Thats a good idea. Replace the rubber line 1st then if u hav to the steel. Sumtimes if the rubber line gets bent the internal passage can break and become blocked

Yea I'm hoping that's the issue. Ill pull it off tonight and have a look at it.

There's another idea that I wanted to run by you lot.
Could I reverse bleed system.
Fill a long hose full of fluid fit it over the end of slave bleed nipple and lightly pressureize the tube to push fluid back up through master cylinder.

I have a long clear plastic tube already

Reverse bleed will work fine. Will be better if you could use a pump to do it