2002 Mazda 323 astina clutch issues

jeffygotjetpack · 23-03-2015, 05:27 PM

Hi all,

I'm currently experiencing issues with my clutch slipping, I've had the clutch replaced, fly wheel machined, new master and slave cylinder, the flex hose replaced and the fluid flushed and replaced. Yet, the problem still exists. The clutch doesn't slip straight away, it is a slow build up, I can feel the clutch releasing higher up the pedal which each gear change.

Has anyone experienced the same issue? Or have any ideas what the problem could be? My mechanic and I have spoken to the several clutch reps with no prevail.

Thanks in advance

- Jef

JDM323 · 23-03-2015, 06:38 PM

pressure plate?

jeffygotjetpack · 23-03-2015, 06:48 PM

It's been replaced.

project.r.racing · 23-03-2015, 07:17 PM

can you explain the symptoms in better detail? i don't really understand.

jeffygotjetpack · 23-03-2015, 07:26 PM

I'll try to explain it as best as I can.
Currently my clutch is releasing at the very top of the pedal travel, which after a small drive my clutch slips every time I accelerate. To fix this my mechanic releases pressure off the slave cylinder (which has been replaced), this makes my clutch release at the lower end of the pedal travel (normal release point), as I am driving and changing gears, the release point of the clutch becomes higher up the pedal travel.

I hope this makes sense.

project.r.racing · 23-03-2015, 07:32 PM

the first bit makes sense, and leads to a pressure plate issue. maybe even incorrect pressure plate used.

the second bit with varying release points i have nil answer for.

Old Grey · 27-03-2015, 08:48 AM

Maybe air in the hyd system expanding with heat.

Diaphragm pressure plates work like a umbrella in the wind. If they are over-compressed they flick the other way, and the pressure reduces when there is not enough gap for the clutch plate stack.

Check the step between the flywheel clutch face and the flywheel pressure plate mounting post is not smaller than std.
Check if the clutch disk is thicker.
Check the step between the pressure plate clutch face and the mounting flange is not more than std.

Check the the throw out bearing is not hooked up and can return all the way back. If it doesn't it may be riding on the PP constantly.

Old Grey · 27-03-2015, 11:01 AM

Conversely, if the gap got bigger compared to the clutch plate stack, the pressure would also reduce.

Maybe the flywheel was ground only on the clutch face, and not the posts that support the PP.

Moobs · 03-04-2015, 03:41 PM

i had a very similar problem in my old aw11 mr2
it could be the clutch rod and freeplay not adjusted properly
so as u drive the fluid heat up pushing against the pedal but if u dont have enough freeplay it could push the other way against the pressure plate slightly causing slip
try backing off the clutch pedal stopper bolt and see if it helps

23-03-2015, 05:27 PM	#1
jeffygotjetpack Junior Member Join Date: Aug 2014 Location: Elimbah Car: 2002 323 Astina BJII Posts: 4	2002 Mazda 323 astina clutch issues Hi all, I'm currently experiencing issues with my clutch slipping, I've had the clutch replaced, fly wheel machined, new master and slave cylinder, the flex hose replaced and the fluid flushed and replaced. Yet, the problem still exists. The clutch doesn't slip straight away, it is a slow build up, I can feel the clutch releasing higher up the pedal which each gear change. Has anyone experienced the same issue? Or have any ideas what the problem could be? My mechanic and I have spoken to the several clutch reps with no prevail. Thanks in advance - Jef

23-03-2015, 06:38 PM	#2
JDM323 Senior Member Join Date: May 2011 Location: North Qld Car: 2002 BJ2 protege Posts: 1,241	pressure plate? __________________ http://www.astinagt.com/forums/showthread.php?t=18798 WORKLOG

27-03-2015, 08:48 AM	#7
Old Grey Junior Member Join Date: Apr 2009 Location: Sydney Car: Astina BG 1991 - Rx7 S4 Posts: 105	Maybe air in the hyd system expanding with heat. Diaphragm pressure plates work like a umbrella in the wind. If they are over-compressed they flick the other way, and the pressure reduces when there is not enough gap for the clutch plate stack. Check the step between the flywheel clutch face and the flywheel pressure plate mounting post is not smaller than std. Check if the clutch disk is thicker. Check the step between the pressure plate clutch face and the mounting flange is not more than std. Check the the throw out bearing is not hooked up and can return all the way back. If it doesn't it may be riding on the PP constantly. Last edited by Old Grey; 27-03-2015 at 11:11 AM.

27-03-2015, 11:01 AM	#8
Old Grey Junior Member Join Date: Apr 2009 Location: Sydney Car: Astina BG 1991 - Rx7 S4 Posts: 105	Conversely, if the gap got bigger compared to the clutch plate stack, the pressure would also reduce. Maybe the flywheel was ground only on the clutch face, and not the posts that support the PP. Last edited by Old Grey; 28-03-2015 at 12:50 PM.

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23-03-2015, 06:48 PM	#3
jeffygotjetpack Junior Member Join Date: Aug 2014 Location: Elimbah Car: 2002 323 Astina BJII Posts: 4	It's been replaced.

23-03-2015, 07:17 PM	#4
project.r.racing Senior Member Join Date: Sep 2004 Location: n/a Car: n/a Posts: 10,929	can you explain the symptoms in better detail? i don't really understand.

23-03-2015, 07:26 PM	#5
jeffygotjetpack Junior Member Join Date: Aug 2014 Location: Elimbah Car: 2002 323 Astina BJII Posts: 4	I'll try to explain it as best as I can. Currently my clutch is releasing at the very top of the pedal travel, which after a small drive my clutch slips every time I accelerate. To fix this my mechanic releases pressure off the slave cylinder (which has been replaced), this makes my clutch release at the lower end of the pedal travel (normal release point), as I am driving and changing gears, the release point of the clutch becomes higher up the pedal travel. I hope this makes sense.

23-03-2015, 07:32 PM	#6
project.r.racing Senior Member Join Date: Sep 2004 Location: n/a Car: n/a Posts: 10,929	the first bit makes sense, and leads to a pressure plate issue. maybe even incorrect pressure plate used. the second bit with varying release points i have nil answer for.

03-04-2015, 03:41 PM	#9
Moobs Junior Member Join Date: Jun 2014 Location: sydney Car: bj astina 1.8 Posts: 14	i had a very similar problem in my old aw11 mr2 it could be the clutch rod and freeplay not adjusted properly so as u drive the fluid heat up pushing against the pedal but if u dont have enough freeplay it could push the other way against the pressure plate slightly causing slip try backing off the clutch pedal stopper bolt and see if it helps