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Post by Harry on Mar 19, 2006 22:34:08 GMT 11
About 4 months ago while leaving Tirau towing the trailer with the mud truck on it The clutch started slipping when I hooked 4th gear.No problem,just backed off the gas till the gearbox caught up.No more problems for 2 months then clutch slipped more and more easily until I could make it slip in 3rd with minor acceleration.Bought a clutch kit and fitted it.Old clutch wasn't badly worn,no sign of oil just a slightly different pattern on the outer 3rd of lining.Now,a month later, the new clutch has started slipping.Any thoughts on why?I,m not buying another clutch!
Thanx,Harry.
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HiMuZuLux
Isuzu Junior
IFS: A great reason to own a 9" angle grinder :)
Posts: 125
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Post by HiMuZuLux on Mar 19, 2006 22:48:08 GMT 11
Did you replace the whole clutch assy or just the plate? Could be a worn pressure plate? Also, is the master cylinder releasing properly? Only two things I can think of off hand...
Either that or you've got a 900BHP ethanol-drinking V12 in the engine bay chewing the clutch to pieces (ok, gotta stop now, getting all drooly at the thought ;D )
Steve
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Post by geeves on Mar 20, 2006 14:42:47 GMT 11
Wich side of the clutch was worn. It will either be a damaged presure plate or flywheel. They might need machining. Dont use the same courior as was used with my flywheel a year ago. I still havnt figured out how they misplaced a 50kg flywheel for 3 days
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Post by mulover on Mar 20, 2006 18:07:34 GMT 11
When i got my clutch replaced the fly wheel had glased over so it had to have a skim taken off it, $50 at the local specialist, this could be stopping the new kit from gripping??
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Les
Isuzu Baby
Posts: 28
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Post by Les on Mar 20, 2006 19:00:02 GMT 11
With the previous worn clutch having been slipping for a while its very likely that the flywheel got pretty hot and glazed, often small surface cracks appear also. If you didnt replace pressure plate its likely to be suspect for same reasons
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Post by Harry on Mar 20, 2006 19:28:14 GMT 11
I replaced clutch plate,pressure plate and thrust bearing.There was no apparent heat cracking on the flywheel and the old plate wasn't worn enough to have slipped.Every slipping clutch I've replaced till now on various vehicles has been down to the rivets.It's the intermittant nature ? of the problem that I can't work out.The clutch starts to bite at less than 1/2 pedal travel so there should be plenty of free play.I'll try a return spring on the slave cylinder and maybe shorten the actuating rod a little and see what happens.
Regards,Harry.
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Post by geeves on Mar 20, 2006 20:03:21 GMT 11
Only other thing that comes to mind is a warning that was suplied with my clutch about centering everything. I was too lazy to do my clutch myself so havnt seen this. Aparently there are 2 locating dowels that need to be lined up. If these are not lined up they get pressed into the bell housing so everything still bolts up but the gearbox shaft isnt centered in the flywheel and this causes problems. The warning stated that they wouldnt acept warrentee claims if marks on the clutch indicated this had happened.
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Post by Harry on Mar 20, 2006 22:21:59 GMT 11
I've never seen a warning like that but I would suggest that if somebody didn't have enough clues to hang the clutch on the dowels while they do it up then they shouldn't be doing the clutch.I admit to using the eyecrometer method of lining up the clutch plate.After the 4th attempt at putting the motor in I turned one up on the lathe and the motor went in 1st try.
Harry.
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Post by geeves on Mar 21, 2006 8:28:00 GMT 11
The dowels are on the bell housing.
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Post by Harry on Mar 21, 2006 21:57:58 GMT 11
And I thought I was up late.You still got a reply in after I gave up.Must have been excited about your birthday and couldn't sleep.One of my daughters has her birthday tomorrow.She's been texting all week to remind us .Wants a bicycle with one of those basket things that hang on the front of the handle bars.I thought they died out in the fifties.
The motor and gearbox won't meet up if those dowels aren't lined up.I'm pretty sure the bolts won't reach the threads either.
Regards,Harry.
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Post by Harry on Mar 27, 2006 21:09:27 GMT 11
The clutch threw another wobbly while I was in Hamilton today picking up my re sealed injector pump.It's still been slipping on and off but today it went the other way.Stopped at a set of lights,dropped it into neutral and when I went to put it back in gear had to pump the clutch up first.Eventually had no pedal at all.Drove home doing clutchless gear changes.Very hard on synchros and ears.Used to work ok on a J1 Bedford.
No fluid left in master cyl but can't find where it's gone either.No sign of it either side of the fire wall and the slave cyl isn't leaking.At a guess I'd say the master cyl has been the cause of all the clutch problems but I'd like to know how.
Regards,Harry.
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Post by geeves on Mar 28, 2006 7:47:06 GMT 11
Mine leaked air into the system and air in the system could cause this as it heats up. New cylinders are cheap at BNT Mine cost 53 2 years ago. At that price not worth rekitting
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Les
Isuzu Baby
Posts: 28
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Post by Les on Mar 30, 2006 17:02:04 GMT 11
Gidday Harry hope u got it sorted they only other thing that comes to mind re the fliud less and potentilly letting air into the system is a fractue in the flexi hose to slave cylinder leaks there are real hard to sopt
cheers Les
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Post by Harry on Mar 31, 2006 8:59:10 GMT 11
Hopefully I've found and found and fixed the problem.The master cyl looks ok but I replaced it with a spare {looked newer] anyway.While removing the slave cyl found that the rubber boot was full of fluid.It wasn't leaking out of that so I didn't pick it up earlier.It must have sucked some air back as the fluid level didn't drop until it all turned to poos at once.I'll find out if the clutch is going to slip next time I'm towing the trailer.
Thanx for all the suggestions.Hope my experience will help someone else out.
Regards,Harry.
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