Difficulty shifting gears

[thebeatjackson]

I'm having a few issues changing gears in my '91 gq Td42.
It shifts fine when cold, after about half an hour or so of driving it becomes very hard to change gears (this problem comes and goes) with the engine of I can change no problem.
It does not grind except trying to get into reverse.
Double clutching does not help, nor does pumping the clutch pedal.
The clutch is not slipping, however I think it may not be releasing properly, not sure how this could be affected by different temperatures though.
Could this be caused by air in the clutch lines?
I have changed the gearbox oil, the problem is the same.

So i'm thinking the problem could be
-I'm in need of a clutch bleed.
-Clutch fingers worn.
-synchro problems.
-or a buggered gearbox?

[the ferret]

I'd be checking out the diaphragm in the clutch booster. problem is not the gearbox.
As you said it could be air in the system. could even be adjustment.
Cheers, the ferret.

[thebeatjackson]

Cheers mate, I'll have a look into it tomorrow, I hadn't considered the diaphragm!

[the ferret]

Cheers mate, I'll have a look into it tomorrow, I hadn't considered the diaphragm!

Could even be a lack of vacuum, are the brakes working ok?
Cheers the ferret.

[thebeatjackson]

No actually, the brakes could certainly be better!
The friction point for the clutch is very close to the floor too.

[thebeatjackson]

I mean they stop the car, there's plenty of meat left on them, but there's no way i'd be able to do an emergency stop, worse than your standard 4wd truck brakes.

[thebeatjackson]

Although the brake pedal is firm before I start the car, then goes soft (i.e normal, not spongy like there's air in the lines) when I start the engine. Would that indicate that there is no vacuum leak?

[the ferret]

The brake pedal will drop once you have vacuum, normal.
Friction point close to floor with clutch means clutch adjustment (not applicable in your case) probably worn clutch plate.
Start saving for a clutch overhaul, sorry to be the bearer of sad tidings

Sadly, your's truly, the ferret.

[Richo460]

Does sound like your clutch is worn , but check that your clutch is getting full travel on the fork and that the clutch line is not cracked and master and slave cyliners are all good before changing the clutch.
How did the oil look when you changed it in the gbox?

[thebeatjackson]

pretty clean when I changed it, no metal filings either.