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Location:
Perth
Registered:
October 2003
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Clutch Issues - not disengaging correctly
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Tue, 03 August 2004 00:02
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After completing my conversion I quickly killed my first clutch, which, with in the car drove fine. I replaced my clutch and at the same time kept the first pressure plate but had it modified to propbably 50% more clamping load (up around 3000kg now). Ever since this my clutch has been getting worse and worse. When i drive the car around normally its alright but when i flog it my gear changes crunch, and sometimes i cannot find a gear at all i have to keep clucthing in and out until it eventually pops into a gear.
Its pretty safe to assume that my clutch is not disengaging all the way. Last night i noticed brake fluid leaking from the master cylinder push rod boot inside the car. Could a screwed seal in the master be the problem? Bypassing pressure? Or maybe will I have to increase the length of the master pushrod for more clutch travel?
Cheers
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Registered:
June 2004
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Re: Clutch Issues - not disengaging correctly
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Tue, 03 August 2004 01:55
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the reason is obviously that you've not got enough pressure because you're losing fluid. follow the trail of brake fluid to the leak and investigate it. is your reservoir full? if it's low there's not enough fluid to engage the clutch to change gears, which means it's leaking pretty bad. the reason it's leaking is because the hydraulic system has to work harder and it wasn't made to. you need to upgrade it.
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Registered:
November 2002
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Re: Clutch Issues - not disengaging correctly
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Tue, 03 August 2004 02:09
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And if you have this same problem but are not suffering any fluid leak, does that mean I need to upgrade to a bigger clutch MC ? Or is it an adjustment problem ?
Thanks,
Mitch.
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Registered:
June 2004
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Re: Clutch Issues - not disengaging correctly
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Tue, 03 August 2004 02:27
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probably both. check your pedal "play". the amount of free movement, it should be less than 2cm.
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Location:
Perth
Registered:
October 2003
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Re: Clutch Issues - not disengaging correctly
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Tue, 03 August 2004 04:45
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My resivour is not losing much oil, but this is because I havent been driving the car. Its coming out of the little boot that covers the push rod, regardless ill have to remove my master cylinder. Is it possible to buy a rebuild kit, or am i completely undergunned now and have to upgrade to a better master cylinder?
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Registered:
June 2004
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Re: Clutch Issues - not disengaging correctly
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Tue, 03 August 2004 10:35
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sounds like the bushes in the MC have given in. you could replace them, i don't know the part numbers, or where YOU could get them, i'm in tassie. you could just get a better, bigger master cylinder instead of fartarsing around with that one when it'll probly happen again anyway. you want a master cylinder that's got a bigger diameter than the one you've got. it has to be the same stroke or longer, try to get one the same so you're pedal movement's the same. i guess you could bore the one you've got out a bit and put a suitable new piston in it.
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Location:
sydney
Registered:
July 2004
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Re: Clutch Issues - not disengaging correctly
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Tue, 03 August 2004 11:08
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did you reatain the same clutch slave cylinder? as was originally matched with the master or did it get changed in the conversion?
if it's the original one DON'T change the bore size of the master cylinder as this will make the slave cylinder overthrough in stroke and will probably pop the piston out or bend the clutch fork.
pull off both the master and the slave cylinder and take them a brake or clutch workshop.
they will check the condition of the bores and match up either the right rebuild kit or suitable replacement master cylinder.
the reason it probably blew was it's old and the brake fluid on the rubber seal over the years has made it go hard and crack and then leak fluid past it.
a common problem on all cars.
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Location:
Perth
Registered:
October 2003
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Re: Clutch Issues - not disengaging correctly
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Tue, 03 August 2004 23:39
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No I have a brand new slave cylinder, dellow supplied it along with the bellhousing, clutch fork etc. As i said at first it worked fine but when i upped the clamping force it works like crap now. mmm might have to make a trip to the clutch expert.
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Location:
Canberra
Registered:
February 2004
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Re: Clutch Issues - not disengaging correctly
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Tue, 03 August 2004 23:59
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Sounds like a master cylinder seal problem to me. I'd rebuild it, or better replace it with a new one and see how it lasts before going anywhere.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Clutch Issues - not disengaging correctly
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Wed, 04 August 2004 00:20
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When the pressure plate was modded, I'm also guessing the pivot point was altered, meaning a longer stroke is needed to diesngage it properly. Fix up the hydraulics first, and if there's still an issue, then it's time to play around with the clutch... But crook hydraulics will definately cause this problem - my old heap I drive around with has the same issue, crook MC and doesnt always like changing gears...
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Location:
sydney
Registered:
July 2004
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Re: Clutch Issues - not disengaging correctly
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Wed, 04 August 2004 09:25
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yeh as i said the m/c seals where probably well on the way out and when you put the extra load required to relaese the clutch the seals couldn't handle it.
just be carefull cause mismatched bore sizes will cause you more problems than you want.
Not that any problems are good. haha
thanks Nathan
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Location:
Perth
Registered:
October 2003
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Re: Clutch Issues - not disengaging correctly
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Thu, 05 August 2004 04:45
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No worries, thanks for the advice ill just put a rebuild kit through it. Do you guys know where the best place to source a kit would be from?
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Toymods Club Treasurer
Location:
Sydney
Registered:
May 2002
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Re: Clutch Issues - not disengaging correctly
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Thu, 05 August 2004 05:43
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On a slightly different tack, if the thrust bearing wasn't the right thickness, I'm guessing this could cause the clutch to not properly disengage too?
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Location:
Adelaide, SA
Registered:
May 2002
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Re: Clutch Issues - not disengaging correctly
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Thu, 05 August 2004 07:12
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| Skip wrote on Thu, 05 August 2004 14:15 |
No worries, thanks for the advice ill just put a rebuild kit through it. Do you guys know where the best place to source a kit would be from?
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I'm guessing it's still the toyota master cylinder? I bought a rebuild kit for mine from toyota. When you take it out you could also get the bore sleeved in stainless steel for extra longevity (or if it's scored). This is usually pretty cheap from a brake/clutch place.
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Location:
Adelaide, SA
Registered:
May 2002
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Location:
Perth
Registered:
October 2003
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Re: Clutch Issues - not disengaging correctly
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Thu, 05 August 2004 08:55
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Thrust bearing thickness has SFA to do with it. I have an adjustable pushrod on the slave and pivot ball in the bellhousing, so i can set it wherever i like. Obviously just not getting enough stroke in the slave cause the master is screwed.
Yer its still the standard Bundera master.
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Location:
Perth
Registered:
October 2003
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Re: Clutch Issues - not disengaging correctly
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Fri, 13 August 2004 01:43
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Problem solvered.
$15 seal kit and a bit of skin off the knuckles, didnt even have to hone it. Clutch works fine now, pedal effort has actually reduced a bit too.
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Location:
Epping, Sydney
Registered:
April 2003
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Re: Clutch Issues - not disengaging correctly
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Mon, 30 August 2004 05:28
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hey Skip
I just changed my box and it feels like the clutch is not completely disengaging at the moment
I just had a look at my master and noticed a veyr small amount of fluid around the boot.
This MC is only maybe 2 years old, I was just wondering how much yours was leaking when you resealed it, and where you got your kit from?
Thanks heaps!
Rob 
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Location:
Perth
Registered:
October 2003
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Re: Clutch Issues - not disengaging correctly
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Mon, 30 August 2004 05:57
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Yeah my master had fluid around from out of the boot too, it was running down my floor mat. I got the kit from REPCO, was a PBR one. ITs piece of piss to rebuild, the hardest part probably is getting the rubber seals onto the piston thingy
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