First I will brief you guys with what was initially installed for the hydraulic clutch system, the changes made, and then the issue I am having after the changes done.
The car as described in my signature is equipped with LS6 engine that is mated to Tremec 5 speed. The car initially had a wilwood master cylinder (0.75 bore) that was mounted in a location on top of the factory hole in the firewall, which I believe was due to the size of the hydraulic clutch reservoir that did not fit under the Brake master cylinder.
With the old set up as mentioned above, the clutch was functioning properly and shifting was smooth.
After smoothing the firewall, I decided to go with Keisler Hydraulic Clutch master cylinder which is basically a Wilwood master cylinder with the billet adapter along with pushrod and oil reservoir. I did not get their hydraulic throwout bearing as I arleady had the Mcloed one.
I installed the their master cylinder in the specified location as per their instructions in the manual and made sure the pushrod is travelling properly. At first, I had an issue with clutch pedal not coming back up after depressing along with clutch not getting engaged. Then bleeding was done again as per the mechanic.
After bleeding completed, the clutch pedal issue was resolved but still the clutch does not get engaged when the engine is running.
The mechanic is saying there is no enough pressure from the bearing to push the pressure plate to engage the clutch.
The only item I changed was the Wilwood Master cylinder with billet adapter from Keisler.
I would really appreciate your advise guys on what else to check for to resolve this freaking clutch issue.
I know you mentioned that both are the same size master cylinders (3/4"), however it sounds like you don't have enough fluid displaced by the master cylinder to fill up the throw out bearing enough to disengage the clutch.
I know I have addressed this issue numerous times on this forum. Simply put, whether you are dealing with brake calipers or throw out bearings, the master cylinder when fully depressed must displace enough fluid to move the caliper piston or bearing in the throw out bearing, the distance you want.
My thoughts are, in your first set up, the throw out bearing may have not had to travel far to disengage the clutch AND it was almost maxed out. Now it has to travel a little farther and you have a situation.
Hope this helps.
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
Bleeding done, what else could be a reason?
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