Race Car Tech Discuss anything related to road racing and auto X.

shifting problem

Old 05-11-10, 09:31 AM
  #1  
Senior Member
Thread Starter
 
Join Date: Jul 2003
Location: San Jose
Posts: 291
Likes: 0
Received 0 Likes on 0 Posts
shifting problem

Just got the car all back together after motor rebuild. Trying to get on the dyno but have a shifting problem. Car is an FD with stock tranny, Exedy twin disc clutch.

Symptom, car is very hard to get into any gear when engine is running. No problem shifting with engine off. Noticed with the car on jackstands that even with clutch pedal fully depressed, if I put pressure on going into any gear then the rear wheels will start spinning.

So, my guess is the clutch is not fully disengaging and/or the pilot bearing got farked putting the tranny back in. Tried a clutch bleed late last night with the wife, didn't do a very good job and it actually seemed to be worse. Thinking I need to do another bleed on the clutch before pulling the tranny and looking for something else wrong or replacing the pilot bearing.

Any thoughts? Sound like a clutch issue to you or pilot bearing or something else.

Btw, can't really hear any unusual noise if it were the pilot bearing, but it is a pretty noisy car to begin with.

-Andy
AMRX7 is offline  
Old 05-11-10, 09:59 AM
  #2  
Lives on the Forum

 
Kentetsu's Avatar
 
Join Date: Jun 2004
Location: Grand Rapids Michigan
Posts: 11,361
Received 1 Like on 1 Post
Is there any adjustment available in the clutch pedal rod? I just installed a new clutch of a slightly different style in my fb, and had to lengthen the rod a bit to get full disengagement. Not sure how that works on the fd though.

Good luck...



.
Kentetsu is offline  
Old 05-11-10, 10:03 AM
  #3  
Sua Sponte
15 Year Member
iTrader: (31)
 
Brent Dalton's Avatar
 
Join Date: Aug 2001
Location: Savannah
Posts: 3,122
Likes: 0
Received 1 Like on 1 Post
Andy, I'm assuming the clutch has been in the car prior to the engine build and working without issue? You disconnected the slave cylinder from the transmission when you removed the engine and left everything else attached? Def sounds like a clutch/clutch component issue. No grinding when you are trying to get it into gear, just difficulty getting it into gear? I'd try bleeding it again to start with. If it did get air into the system, it can be very difficult to get out sometimes.
Brent Dalton is offline  
Old 05-11-10, 10:09 AM
  #4  
Senior Member
Thread Starter
 
Join Date: Jul 2003
Location: San Jose
Posts: 291
Likes: 0
Received 0 Likes on 0 Posts
Yes, same stuff as was in the car. I was pretty careful reinstalling so I'm hoping the bleeding is the problem. Once in gear the car drives just fine, no unusual noises, clutch feel normal.

Will try to bleed it again today and cross fingers as I really really don't want to pull the tranny out.

-Andy
AMRX7 is offline  
Old 05-11-10, 10:17 AM
  #5  
All out Track Freak!
iTrader: (261)
 
Fritz Flynn's Avatar
 
Join Date: Jul 2001
Location: Charlottesville VA 22901
Posts: 10,313
Received 107 Likes on 92 Posts
If the clutch pedal feels normal and the clutch is the same I'd say bad clutch fork. If the clutch is soft it could be air in the system but if you've already bled that's doubtful.

If the clutch is new I'd try adj the clutch rod as suggested. The fatter twin plate clutch plates will move the throw out bearing position back and the clutch fork position forward so the slave has to extend further to pull the clutch back.

Finally it may be as simple as the not getting the snap ring on the clutch snapped in place.
Fritz Flynn is offline  
Old 05-11-10, 01:28 PM
  #6  
Senior Member
Thread Starter
 
Join Date: Jul 2003
Location: San Jose
Posts: 291
Likes: 0
Received 0 Likes on 0 Posts
Rebled the clutch again and made sure to take out any free play in the clutch pedal. I had noticed there was some unused travel in the pedal so took almost all that out. Now it disengages the clutch more and seems to be ok. Why it wasn't an issue before not sure, must have been borderline.

Never been happier to hear the twin disc rattle.

Thanks for replies.

-Andy
AMRX7 is offline  
Old 05-11-10, 04:29 PM
  #7  
needs more track time
iTrader: (14)
 
gracer7-rx7's Avatar
 
Join Date: Mar 2006
Location: Bay Area CA
Posts: 7,833
Received 14 Likes on 13 Posts
Yep. Sounds like a clutch fork but I guess its not.

I have a newer, reinforced, 20k mile one that I'll let go for cheap if you need it and want to save a few bucks.
gracer7-rx7 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
risingsunroof82
1st Generation Specific (1979-1985)
22
09-22-15 01:20 PM
The1Sun
1st Generation Specific (1979-1985)
7
09-18-15 07:13 PM
The1Sun
New Member RX-7 Technical
5
09-15-15 04:45 PM
REX7&Z32TT
New Member RX-7 Technical
2
09-14-15 08:46 AM


Thread Tools
Search this Thread
Quick Reply: shifting problem


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: