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Author Topic: Manual gearbox problem  (Read 8875 times)

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Andy A

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Manual gearbox problem
« on: 25 May 2015, 19:32:02 »
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
« Last Edit: 25 May 2015, 19:38:32 by Andy A »
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Andy B

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Re: Manual gearbox problem
« Reply #1 on: 25 May 2015, 19:55:11 »
slave cylinder  :-\

selectors worn  :-\
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chrisgixer

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Re: Manual gearbox problem
« Reply #2 on: 25 May 2015, 19:55:50 »
Checked manual gear box oil level...?
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Andy A

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Re: Manual gearbox problem
« Reply #3 on: 25 May 2015, 20:09:13 »
Quote from: Andy B on 25 May 2015, 19:55:11
slave cylinder  :-\

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

selectors worn  :-\

Quote from: chrisgixer on 25 May 2015, 19:55:50
Checked manual gear box oil level...?

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

Thanks
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terry paget

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Re: Manual gearbox problem
« Reply #4 on: 25 May 2015, 20:12:50 »
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.
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chrisgixer

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Re: Manual gearbox problem
« Reply #5 on: 25 May 2015, 20:16:54 »
No experience with these Edwardian contraptions you understand, but I do remember an old post, by ians iirc. Haynes quotes 1.2 litres
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Andy A

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Re: Manual gearbox problem
« Reply #6 on: 25 May 2015, 20:33:02 »
Just looked in the diy section and nothing there about changing manual gearbox oil.

Anyone know what oil is OK to use?

Thanks
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chrisgixer

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Re: Manual gearbox problem
« Reply #7 on: 25 May 2015, 20:38:18 »
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Andy B

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Re: Manual gearbox problem
« Reply #8 on: 25 May 2015, 20:45:07 »
Quote from: Andy A on 25 May 2015, 20:09:13
....

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
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Andy A

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Re: Manual gearbox problem
« Reply #9 on: 25 May 2015, 20:59:08 »
Quote from: Andy B on 25 May 2015, 20:45:07
Quote from: Andy A on 25 May 2015, 20:09:13
....

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?
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Andy B

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Re: Manual gearbox problem
« Reply #10 on: 25 May 2015, 21:07:10 »
Quote from: Andy A on 25 May 2015, 20:59:08
....

Pumping the pedal makes no difference at all.
:(

Quote from: Andy A on 25 May 2015, 20:59:08
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.
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05omegav6

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Re: Manual gearbox problem
« Reply #11 on: 25 May 2015, 22:22:20 »
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 :y
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Andy A

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Re: Manual gearbox problem
« Reply #12 on: 26 May 2015, 10:52:36 »
Quote from: Taxi Al on 25 May 2015, 22:22:20
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 :y

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.  :y
« Last Edit: 26 May 2015, 11:00:47 by Andy A »
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05omegav6

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Re: Manual gearbox problem
« Reply #13 on: 26 May 2015, 12:24:55 »
Quote from: Andy A on 26 May 2015, 10:52:36
Quote from: Taxi Al on 25 May 2015, 22:22:20
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 :y

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

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Re: Manual gearbox problem
« Reply #14 on: 26 May 2015, 12:51:44 »
A FAIR BIT...? :o


;D
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