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Old 05-03-2013, 09:59 AM   #1
mikemcl
Scooby Newbie
 
Member#: 346961
Join Date: Feb 2013
Location: rockledge FL
Vehicle:
2006 wrx
wrb

Default Slave Cyl question, new exedy clutch slipping

I searched for hours, was hoping not to create a dupe thread. Here goes...

I have a 2006 WRX TR and just installed a new exedy ff502 flywheel and 15804 stage 1 clutch kit. The clutch does not have enough clamping power to even kill the motor in 1st with the ebrake up. it just slips and scrapes (this was a troubleshooting tip in the manual).

I have installed, reinstalled, checked for hot spots, glazed clutch surface, cleaned it, checked fork, TOB, etc... This thing has literally not enough pressure to go from 0-10mph in less than 15 secs. it is not in backward.

I have adjusted pedal to relieve any pre-load, and pedal has free play of about .4-.5 inch. Pedal "feels" perfect, and action is nice.

My concern is this- when i manually push the clutch fork against the slave cyl, the slave cyl retracts, leaving fork free play, but then within about 4 seconds, the slave cyl extends and puts significant pressure on the fork. It isnt enough pressure to actutate fully, but it definately puts 10 or more more pounds, and TOB is against the pressure plate splines.

The question is: is there supposed to be "free play" at the top of the clutch fork, or is my slave doing what it's supposed to do? it seems to me that having pressure on the TOB constantly isn't right. my engagement into gears is good and smooth, but clamping pressure is almost non-existant. this is with no boost, only idle speeds or 2k revs.

A friend mentioned bleeding, so i did that with mityvac and also the old fashioned way when problem persisted. the hyd system was never messed with or replaced. PLEASE HELP!

Thanks very much for any advice you can offer!

Mike
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Old 05-06-2013, 06:50 PM   #2
Wlkonh2o
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Member#: 275011
Join Date: Feb 2011
Location: Wilmington, NC
Vehicle:
2007 Impreza WRX
Urban Grey

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i know yours is new but perhaps the pressure plate is faulty. I installed the same clutch kit into my 07 WRX and 8k miles later i have the same experience you are having with the new one. So my two cents would be to inspect your pressure plate. make sure the prongs all have the same rise. And try putting some pressure on the plate and see if you notice more flex from certain prongs vs others. I'm not sure about the play you speak of but my car is still blown to pieces so i will look and see if there is play on mine, then report back to you.
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Old 05-11-2013, 09:37 PM   #3
Wlkonh2o
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Member#: 275011
Join Date: Feb 2011
Location: Wilmington, NC
Vehicle:
2007 Impreza WRX
Urban Grey

Default

Quote:
Originally Posted by mikemcl View Post
My concern is this- when i manually push the clutch fork against the slave cyl, the slave cyl retracts, leaving fork free play, but then within about 4 seconds, the slave cyl extends and puts significant pressure on the fork. It isnt enough pressure to actutate fully, but it definately puts 10 or more more pounds, and TOB is against the pressure plate splines.

The question is: is there supposed to be "free play" at the top of the clutch fork, or is my slave doing what it's supposed to do? it seems to me that having pressure on the TOB constantly isn't right. my engagement into gears is good and smooth, but clamping pressure is almost non-existant. this is with no boost, only idle speeds or 2k revs.
checked my setup and mine constantly applies pressure. its an auto adjusting system to my understanding so it will always maintain a certain level of pressure with no play.
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