clutch/tranny issues

[beat1]

Hey everyone.

Saturday was my second track day of the year, all went well.

Today I decided to go back again and but that didnt go so well. Around the 10th minute in the session, I started to feel resistance during my shifts, 2 to 3 and 4 to 5. I continued a little to see if it was going to go by itself doing a cooldown lap but it was getting worse, the pedal clutch felt "mushy" or soft so I decided to stop. In the pit, I couldnt engage any gear at all.

I let the car on for 5 minutes then off. 10 minutes later, I turned on again, I was able to enter the gears but the clutch pedal was still soft and the friction point is almost at the floor, unlike before that was higher. It does not smell anything from the tranny and I was able to come home.

The pedal remind me of the feel as if there will be air in the system...

The only change I made recentely that comes to mind is removal of the clutchs spring (https://www.ft86club.com/forums/showthread.php?t=103157) two weeks ago, once again, everything went well on Saturday.

The car is a 2014 with 20k miles, everything is stock apart from pads and tires.

Anyone have any ideas? It's late now so I'll investigate more tomorrow.

[humfrz]

Originally Posted by beat1

Hey everyone.

Anyone have any ideas? It's late now so I'll investigate more tomorrow.

I'd suggest you bleed the clutch system.

See...how simple that was ..


humfrz

[highway7]

Failed clutch slave cylinder or boiled off brake fluid in the clutch lines. Look at the clutch slave cylinder ontop of the tranny, if you see fluid leaking out then the clutch slave cylinder is leaking and you'll need a new one.



Most likely it's the brake fluid boiled due to high temps from tracking, causing vapor lock. Drain and refill with high temp racing brake fluid.

[Mr.ac]

Yep seems like boiled clutch fluid, aka brake fluid.
Like others said bleed, add new fluid.

[Ultramaroon]

There's not a single part anywhere near that area that would get hot enough to boil water much less brake fluid. That's just plain idiotic.


Sounds like the reservoir ran dry. OP, I'm going to assume you didn't look.

[Mr.ac]

I wouldn't say boiling temps, but it does get nice and toasty.
Assuming it had the same fluid since '14 you hit the nail on the head.
Or it maybe old fluid with moisture in it, and it ran dry.

Either way new fluid is in order.

[beat1]

Hmm that could make sense, I didnt know until now that you could overheat clutch fluid. Forgot to mention my brake fluid was changed for Gulf RF800 last year but didn't do the job myself. The clutch reservoir is a different system right? Brake and clutch are closed system that "don't see" each other? Means its the stock fluid then.

The level is between min and max, I have left over RF800, I could flush and use that.

[Sportsguy83]

Originally Posted by beat1

Hmm that could make sense, I didnt know until now that you could overheat clutch fluid. Forgot to mention my brake fluid was changed for Gulf RF800 last year but didn't do the job myself. The clutch reservoir is a different system right? Brake and clutch are closed system that "don't see" each other? Means its the stock fluid then.

The level is between min and max, I have left over RF800, I could flush and use that.

Yes separate closed systems.

[beat1]

Yep, that was it New clutch fluid with good bleeding fixed it, shouldve done it before, the clutch pedal feel so much better than before. Thanks everyone!