Clutch Arm Travel

[madjak]

Hi All,

I have just bought my first T25, an 88 JX TD and I'm starting to go through some of its mechanical faults so I may be posting up here a bit.... I have not checked what the gearbox code is yet but I believe 3H was standard, is this correct?

I have some problems selecting gears (crunching) and with clutch judder. The gearbox mount is shot so I'll be doing that but was thinking that some of the problems may be down to the hyraulic clutch as well.?

Went under tonight and measured 14mm of travel at the slave cylinder. I searched on here and found another thread and people on there were saying over 20mm or about an inch is normal, does this seem right?

If so could the 14mm of travel be casing some of the slection/judder issues?

Any help appreciated.

[kevtherev]

judder is commonly caused by engine mounts and gearbox mounts and or oil contamination from the crank seal.

when was the gear oil changed?
if you don't know then I would change it and see if it still crunches.
When the clutch is depressed is there any creep?
if not then it would not cause crunch
Has the selector rod got bent?
this will cause poor selection first and third
worn syncro rings will cause crunch, mine crunches in second when cold

[madjak]

judder is commonly caused by engine mounts and gearbox mounts and or oil contamination from the crank seal.

Thanks for your reply, the front mount is shot, there are leaks from the injector return pipes, rocker cover gasket and oil filter housing that are running down the engine so I suppose oil could be getting in from these as well but may have to drop the box and see about the seal as well.

when was the gear oil changed? I suspect never
if you don't know then I would change it and see if it still crunches. OK its added to the service list, what size are the plugs in the gearbox?
When the clutch is depressed is there any creep? Pretty certain there was no creep
if not then it would not cause crunch
Has the selector rod got bent? I don't know but will check
this will cause poor selection first and third
worn syncro rings will cause crunch, mine crunches in second when cold Mine was crunching going up and down the gearbox quite bad between 5th and 4th and I wasn't hurrying it

Looks like I have some work to do!

[California Dreamin]

??......the most obvious thing would be to bleed the clutch to make sure that there is no air in the hydraulics....crunching could be down to something as simple as the clutch is not fully disengaging.

Martin

[madjak]

??......the most obvious thing would be to bleed the clutch to make sure that there is no air in the hydraulics....crunching could be down to something as simple as the clutch is not fully disengaging.

Martin

Gave the clutch a good bleed out last night, and same problems judder and crunching. Only does it when it well warmed through though. Well worth changing it, did have air in it and was very murky.

I'm going to put a new front gearbox mount on Saturday, hopefully. If the gear oil turns up in time I'll do that as well.

Mate recons it could be the clutch not disengaging as well, he says in his experience the slave cylinder should push the release arm over 20mm. About 22-23mm so I may have a hydraulic issue but the fact its fine when cold sways me more toward clutch contamination or damage. Any thoughts?

[Aidan]

could be spigot bearing if worse when hot, seem to be that way

[madjak]

could be spigot bearing if worse when hot, seem to be that way

OK thanks, will check that out as well.

So plan of attack for judder is;

Resolve oil leaks on top end to ensure oil not getting in to bell housing
Check/Replace Gearbox/Engine Mounts

Then if not resolved drop Gearbox and check:
Gearbox Shaft Bearing and Seal
Spigot Bearing and Seal
Clutch Assembly, probably replace.