Clutch slave blowing air?
07-31-2017, 01:35 PM
#16
Rennlist Member
Thread Starter
.The system seems designed to make sure you run out of clutch fluid before you run out of brake fluid. That makes sense.
Last edited by Otto Mechanic; 07-31-2017 at 02:09 PM.
07-31-2017, 01:45 PM
#17
Rennlist Member
Thread Starter
BTW: The last time I bled the hydraulics on a clutch was 1982 when I sold my 1971 914 (biggest mistake I've made baring my second wife). I bought the 928 in 1985, so this is the first manual transmission Porsche I've owned in 35 years. It's difficult to learn these things all over again...
07-31-2017, 01:52 PM
#18
Rennlist Member
Thread Starter
Well, that's not technically true; I did, very briefly, own a 931 that I drove to my shop (once) and six months later (after replacing the turbo and suspension) drove to the gas station so my 2nd wife could drive it to work the next day.
On the way I encountered a Fiat 124 sedan operated by a man driving drunk on a suspended license, sideways in my lane. I never made it to the gas station but I did make it to the hospital. They pulled me out the roof of that 931, which was totaled of course. All I got were bruises, but I lost the car.
So I'm not sure that really counts since I never had a chance to bleed the clutch.
On the way I encountered a Fiat 124 sedan operated by a man driving drunk on a suspended license, sideways in my lane. I never made it to the gas station but I did make it to the hospital. They pulled me out the roof of that 931, which was totaled of course. All I got were bruises, but I lost the car.
So I'm not sure that really counts since I never had a chance to bleed the clutch.
Last edited by Otto Mechanic; 07-31-2017 at 02:08 PM.
07-31-2017, 02:26 PM
#19
Rennlist Member
Thread Starter
On a related note.
In case no one has noticed yet, I'm firmly PO'd by the office dwellers in D.C. who decided we didn't need blue brake fluid. Or any two colors, I don't really have a preference. I mean seriously, does anyone need a desk jockey to tell them how to maintain a car? Honestly? Someone who probably can't change their own oil to save their life?
The US used to be a pretty good place to live.
In case no one has noticed yet, I'm firmly PO'd by the office dwellers in D.C. who decided we didn't need blue brake fluid. Or any two colors, I don't really have a preference. I mean seriously, does anyone need a desk jockey to tell them how to maintain a car? Honestly? Someone who probably can't change their own oil to save their life?
The US used to be a pretty good place to live.
Last edited by Otto Mechanic; 07-31-2017 at 04:04 PM.
07-31-2017, 03:23 PM
#20
The slave just blew air. I was using a Motive Power Bleeder and the entire system was pressurized, but there was no fluid in the Motive, just air. The reservoir was full to the top with ATE Blue, but when I opened the clutch slave bleed screw it Just blew air, and lots of it. Air.
07-31-2017, 04:02 PM
#21
Rennlist Member
Thread Starter
07-31-2017, 06:54 PM
#22
Lol...we have to refrain from the politics of bleeding.
The gate in the reservoir keeps the brakes working if there is a leak in the clutch hydraulics and the opposite. Very hard to see with clear fluid.
I always packed a spare trunnion in the 914 days and a cable until the terry cables arrived on the market. Side shifter cars where so much better.
124s always pooled oil in the plug wells and fouled your new plugs no matter how well you cleaned them out. The dion rear end was a lot of fun though.
You might raise the rear to get the clutch master sitting level.
The gate in the reservoir keeps the brakes working if there is a leak in the clutch hydraulics and the opposite. Very hard to see with clear fluid.
I always packed a spare trunnion in the 914 days and a cable until the terry cables arrived on the market. Side shifter cars where so much better.
124s always pooled oil in the plug wells and fouled your new plugs no matter how well you cleaned them out. The dion rear end was a lot of fun though.
You might raise the rear to get the clutch master sitting level.
08-01-2017, 01:01 PM
#23
Three Wheelin'
As far as the DYE, I asked a Chemist at work and she gave me some.. Now I take Regular ATE and turn it into Super Blue... Its a compatible dye and you would believe how little it takes to turn it blue..
08-01-2017, 09:17 PM
#26
Race Car
08-01-2017, 09:31 PM
#27
Race Car
I don't think I have ever bled a clutch slave the ways described here.
If I'm mounting a new one, I bench bleed it and mount it.
To make sure it's free of air, I use a small angled head prybar and insert at the bell housing and push the clutch fork (and slave piston rod) towards the cylinder.
The volume of fluid in the cylinder is more than that of the line so you are pushing fluid and air all the way back to the reservoir. When you release, the cylinder sucks a full gulp of airless fluid.
If I want to refresh fluid, I just open the bleed, exercise the travel in, hold prybar there, snug bleed screw and turn loose, fresh fluid fills cylinder.
T
If I'm mounting a new one, I bench bleed it and mount it.
To make sure it's free of air, I use a small angled head prybar and insert at the bell housing and push the clutch fork (and slave piston rod) towards the cylinder.
The volume of fluid in the cylinder is more than that of the line so you are pushing fluid and air all the way back to the reservoir. When you release, the cylinder sucks a full gulp of airless fluid.
If I want to refresh fluid, I just open the bleed, exercise the travel in, hold prybar there, snug bleed screw and turn loose, fresh fluid fills cylinder.
T
08-01-2017, 11:28 PM
#28
Rennlist Member
Thread Starter
EDIT: Sorry, GPA, not Paul...
08-02-2017, 01:27 PM
#30
Three Wheelin'
Allot of things we purchase has added Dye, Rad Fluid is a perfect example, we make Cooling fluid for Welding Robots and Tig Welders, all have added Dyes.. Not sure what was up the DOT's butt as far as the super blue? anyhow.. Ill take a Pic and Post my magic dust...