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-   -   Hyd. throwout bearing question (http://www.clubcobra.com/forums/transmission-talk/106381-hyd-throwout-bearing-question.html)

jlb169 08-26-2010 01:05 PM
Hyd. throwout bearing question
 
Guys I have a new Wilwood master with a Mcleod bearing setup. when the car is cold and for the first 10 miles nothing slips. After everything is hot I'm getting clutch slipping. Car has 200 miles on it. I'm thinking it may still have air in the lines, since these are a bear to get bled. Any ideas?

blykins 08-26-2010 02:24 PM
What's the clearance between the bearing and the pressure plate fingers at rest?

Diaphragm plate? Long style plate?

jlb169 08-26-2010 07:07 PM
I haven't pulled it apart yet. but I do know it was set to the recommended clearance when we built it. any other possibilities.

PatBuckley 08-26-2010 07:12 PM
Where does your pedal engage?

jlb169 08-26-2010 08:35 PM
an inch off the floor, also have play at the top of the pedal

Z-linkCobra 08-27-2010 08:23 AM
Does the engagement level or the play at the top of the pedal change from when the cars cold to hot?

jlb169 08-27-2010 08:38 AM
seems to get closer to the top like something is expanding the bearing and not letting the clutch fully engage. thats why I was leaning towards air.

Z-linkCobra 08-27-2010 10:18 AM
Air will generaly make for a soft and spongy pedal. It will almost feel as if your pushing on a spring instead of a shock absorber...if that makes sence. The amount of air you would have to have in the system for that much expansion due to heat would be alot. Im not sure you would even have a pedal if there was that much air.

Im thinking the clearence is getting tighter on the sleeve and not letting the bearing retract all the way. Why that is happening is the million dollar question. Maybe a little nick during set up, maybe it was machined wrong from the factory, etc etc etc.

I hate to say it but it need to be pulled and inspected. I think youll likely find the problem once you put an eyeball and a mic on it.

Gene

dkinemond 08-27-2010 12:03 PM
How close is your line to the bearing to your exhaust. Maybe the fluid is overheating and expanding. Maybe insolating that line or moving it would help. You could also try a high temp fluid.

Doug

jlb169 08-27-2010 12:11 PM
Thats a thought. the line does run right past the headers. suggestion for high temp fluid?

dkinemond 08-27-2010 01:22 PM
I used the highest temp fluid that jegs had. I used non synthetic dot three. I believe that is what Mcleod recomends. I also had to reroute my hard line away from the header.

jlb169 08-27-2010 01:53 PM
Thanks I 'll take a look at it. I think it's dot 4 in it now. I'm not sure what the difference is but I'll look into it.

Tommy 08-27-2010 02:09 PM
If the problem comes from heated fluid, you should be able to rig a temporary heat shield to test the idea. That would be a quick and easy way to determine if that is the problem. BTW, I don't think that is the problem.

Z-linkCobra 08-27-2010 02:24 PM
Quote:
Originally Posted by Tommy (Post 1074438)
If the problem comes from heated fluid, you should be able to rig a temporary heat shield to test the idea. That would be a quick and easy way to determine if that is the problem. BTW, I don't think that is the problem.

Its a great place to start. Beats the hell out of pulling the bearing...lol. I have to agree though,I dont think thats the problem either.

Z-linkCobra 09-01-2010 06:27 AM
I wonder what the problem ended up being.


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