Club Cobra

Club Cobra (http://www.clubcobra.com/forums/)
-   ALL COBRA TALK (http://www.clubcobra.com/forums/all-cobra-talk/)
-   -   Clutch master fluid (http://www.clubcobra.com/forums/all-cobra-talk/142545-clutch-master-fluid.html)

Storman Norman 07-10-2019 12:06 PM

Clutch master fluid
 
As I am a new owner of what once was my Uncle's car before he passed and am jumping into this Cobra screen. I am a Mechanic but that doesn't mean I know it all. After running this car a while the clutch began to drop off like the slave cylinder was leaking and the reservoir was empty. Looked in the reservoir and it had fluid. tried to bleed the slave but it would not bleed right so I removed the reservoir and dumped it out to find a bunch of crud like someone used the wrong fluid and caused one of the fluids to turn into lumps which is probably plugging the master cylinder. This brings me to my question. I have a Superformance MKIII and I am wondering what is the correct fluid for this master cylinder? Is this a Mineral oil or a Dot 4 system?

twobjshelbys 07-10-2019 01:48 PM

Mine behaved exactly like this with the dirty fluid and losing fluid. It was the master cylinder gaskets all caused by the fact that the master and, in my case, the hydraulic throw out bearing, were not properly aligned. You can replace the master but depending on which manufacturer it might have a rebuild kit. First I rebuilt the master cylinder, then I had to rebuild the HTOB, and after the second time the HTOB ate the gaskets I ditched the whole setup and went to a more traditional master/slave setup.

cycleguy55 07-10-2019 02:45 PM

Quote:

Originally Posted by Storman Norman (Post 1464212)
As I am a new owner of what once was my Uncle's car before he passed and am jumping into this Cobra screen. I am a Mechanic but that doesn't mean I know it all. After running this car a while the clutch began to drop off like the slave cylinder was leaking and the reservoir was empty. Looked in the reservoir and it had fluid. tried to bleed the slave but it would not bleed right so I removed the reservoir and dumped it out to find a bunch of crud like someone used the wrong fluid and caused one of the fluids to turn into lumps which is probably plugging the master cylinder. This brings me to my question. I have a Superformance MKIII and I am wondering what is the correct fluid for this master cylinder? Is this a Mineral oil or a Dot 4 system?

The manual update I found at https://www.secondstrike.com/Technic...V37_Update.pdf says the following:
Any DOT 3 or DOT 4 or DOT 5.1 fluid can be used. DO NOT use DOT 5.

Also of note is the following:
The clutch slave cylinder seals have a tendency to fail after several years. Consider replacing the slave cylinder every five years as preventative maintenance. If the fluid is black when bled, change the slave cylinder now.

Gaz64 07-10-2019 04:13 PM

Quote:

Originally Posted by Storman Norman (Post 1464212)
I am a Mechanic but that doesn't mean I know it all.

Glad to see another admits to that statement.

39 years for me, and I'm still learning something new everyday.

Some young guys think they know it all these days.

Gary

pgermond 07-10-2019 05:12 PM

I use DOT 3 or 4. My clutch m/c was dying so I decided to replace it. It was filled with sludge that I equate it to 13 years of driving and the hydraulic line being close to the header (lots of extreme heat). You can also use Wilwood hi-temp 570 racing brake fluid, but not necessary.

Andrewyoung78 07-10-2019 08:20 PM

superformance mkiii
 
my clutch slave dump all the fluid out and after replacement and bleed the slave, the clutch grab almost at the top and clutch slip under load in third gear. It doesn't appeal to have any more bubble in the system. What else I should look at. Thanks.

Gaz64 07-10-2019 09:47 PM

Quote:

Originally Posted by Andrewyoung78 (Post 1464226)
my clutch slave dump all the fluid out and after replacement and bleed the slave, the clutch grab almost at the top and clutch slip under load in third gear. It doesn't appeal to have any more bubble in the system. What else I should look at. Thanks.

Sounds more like worn out clutch plate or weak pressure plate.

Internal or external slave cylinder?

Gary

Andrewyoung78 07-10-2019 11:56 PM

external slave from Napa, matching the one superformance installed. The pressure plate and everything else were fine prior to the leak from the slave.

Gaz64 07-11-2019 05:37 AM

Andrew, you should start a new thread, rather than changing the subject and show respect to the original thread creator.
Gary

hauss 07-11-2019 11:39 AM

Look close at the master I have a backdraft but the operation is the same.I changed three slave cylinders before realising it was the master the whole time.


All times are GMT -7. The time now is 08:06 PM.

Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: