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[Andy A]

Engine off gearbox goes into gears smoothly with or without clutch.

Engine running and using clutch its very hard to get into any gear including reverse. When driving gears change really smoothly. When stopped and put into neutral the gearbox sometimes goes back into gear fine and other times it won't

Reversed bleed the clutch today and it made no difference.

What could be the problem?

Thanks

[Andy B]

slave cylinder 

selectors worn 

[chrisgixer]

Checked manual gear box oil level...?

[Andy A]

slave cylinder 

I pressure tested the system and it was stable at 10 psi. Would it leak if faulty?

selectors worn 

Checked manual gear box oil level...?

No I haven't. I will check it tomorrow and see.

Thanks

[terry paget]

Same problem on son Ben's 2.2 Bleedling  achieved nothing. Slave cylinder is concentric, isn't it? So right in the middle of the gearbox, can only be changed with gearbox out of car. I recall in a discussion thread some while ago they were claimed to be bulletproof. Thanks for g/b oil level suggestion, Chris; I will check that when I have the car in for MOT soon.

[chrisgixer]

No experience with these Edwardian contraptions you understand, but I do remember an old post, by ians iirc. Haynes quotes 1.2 litres

[Andy A]

Just looked in the diy section and nothing there about changing manual gearbox oil.

Anyone know what oil is OK to use?

Thanks

[chrisgixer]

?

http://oldsite.omegaowners.com//forum/YaBB.pl?action=print;num=1189149172

[Andy B]

....

I pressure tested the system and it was stable at 10 psi. Would it leak if faulty?
 ......

Other than obvious leaks in the system, I wouldn't think that would make any difference. Does pumping the clutch pedal make any difference? It's the total movement of the concentric cylinder that makes the difference.  I doubt that gear box oil level or oil quality will make a difference to gear selection

[Andy A]

....

I pressure tested the system and it was stable at 10 psi. Would it leak if faulty?
 ......

Other than obvious leaks in the system, I wouldn't think that would make any difference. Does pumping the clutch pedal make any difference? It's the total movement of the concentric cylinder that makes the difference.  I doubt that gear box oil level or oil quality will make a difference to gear selection

Pumping the pedal makes no difference at all.

I have some Millers (5522) TRX 75W/90 Semi synthetic here. Is it OK to mix?

[Andy B]

....

Pumping the pedal makes no difference at all.

I have some Millers (5522) TRX 75W/90 Semi synthetic here. Is it OK to mix?

Sorry, no idea. 

The last manual gearbox oil I bought for an Astra was from Vauxhall. It wasn't expensive.

[05omegav6]

Fluid level first, but they can be notchy when cold, especially first/reverse...

You might also find that the rubber hanger which holds the rear of the selector up in the tunnel is shot

I replaced mine with an M6 bolt and a stack of washers...

Will add pic in morning, but makes the gearchange feel more robust than before

[Andy A]

Fluid level first, but they can be notchy when cold, especially first/reverse...

You might also find that the rubber hanger which holds the rear of the selector up in the tunnel is shot

I replaced mine with an M6 bolt and a stack of washers...

Will add pic in morning, but makes the gearchange feel more robust than before

If the rubber hanger was gone and that in turn causes the linkage to be out of adjustment, wouldn't it still be hard putting into gear with the engine off as well as the engine running?

Is this how a bad rubber hanger effects the gear shift?

I have checked the gearbox oil and it is fine. 

[05omegav6]

Fluid level first, but they can be notchy when cold, especially first/reverse...

You might also find that the rubber hanger which holds the rear of the selector up in the tunnel is shot

I replaced mine with an M6 bolt and a stack of washers...

Will add pic in morning, but makes the gearchange feel more robust than before

If the rubber hanger was gone and that in turn causes the linkage to be out of adjustment,wouldn't it still be hard putting into gear with the engine off as well as the engine running?

Is this how a bad rubber hanger effects the gear shift?

I have checked the gearbox oil and it is fine. 

Not necessarily as there's a fair bit of slop in the box without any torque being put through it...

[chrisgixer]

A FAIR BIT...?