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Auto stuck in 1st


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My '92 UK Auto is stuck in first gear. Occurred about a mile into my journey when I put my foot down to overtake. Engages neutral OK & reverse but won't change up. Tried electronic diagnostics mentioned in another thread but no faults were found. Clutch burnt out? It's original box with 120K on the clock, time for a manual conversion? Any advice welcome!

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Guest T-Pot

does the car seem very slow to move off?

 

there is a fuse in the drivers footwell, i would start by looking if its blown mate

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My '92 UK Auto is stuck in first gear. Occurred about a mile into my journey when I put my foot down to overtake. Engages neutral OK & reverse but won't change up. Tried electronic diagnostics mentioned in another thread but no faults were found. Clutch burnt out? It's original box with 120K on the clock, time for a manual conversion? Any advice welcome!

Check your Transmission fluid and see if its burn't Ie: Brownish instead of red.

Could be second gear clutches that have worn out.

The way to check if the second gear clutches have worn out is to put the transmission in the Hold setting and take off in drive , if it pulls ok then its more likely an electronic fault if it does not pull ok then its more than likely clutches.

HTH :)

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I have gone through the full electrics test, testing every pin on the auto control unit & all signals are correct. So me thinks must be mechanical.

 

The oil on the dipstick is at the right level but is a very light brown colour. I have had the car 8+ years & it has always been this colour. It is still a very runny consistancy. I assume the auto box oil has never been changed in any of the Nissan dealers main services it has had.....

 

Today I drained the oil which looked very black & dropped the sump cover. A little bit of sludge build up on the magnet but very minor. The strainer gauze is undamaged & appears clean. The slightly concerning find was the 3 sheared bolt heads!!!

 

These have come from what I believe to be the band servo piston housing which has dropped down & is held in place by the sole surviving bolt. It is a round casing about 3 inches diameter in the front drivers side corner, looking up from underneath. Should I be brave & release the remaining bolt, or just call the garage for a tow in. The car will still run in 1st gear so I'm reluctant to delve further incase I leave all drive.

 

Any ideas what may have caused this to fail like this or what the problem is? I assume it's a rebuild/replacement job.

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I have gone through the full electrics test, testing every pin on the auto control unit & all signals are correct. So me thinks must be mechanical.

 

The oil on the dipstick is at the right level but is a very light brown colour. I have had the car 8+ years & it has always been this colour. It is still a very runny consistancy. I assume the auto box oil has never been changed in any of the Nissan dealers main services it has had.....

 

Today I drained the oil which looked very black & dropped the sump cover. A little bit of sludge build up on the magnet but very minor. The strainer gauze is undamaged & appears clean. The slightly concerning find was the 3 sheared bolt heads!!!

 

These have come from what I believe to be the band servo piston housing which has dropped down & is held in place by the sole surviving bolt. It is a round casing about 3 inches diameter in the front drivers side corner, looking up from underneath. Should I be brave & release the remaining bolt, or just call the garage for a tow in. The car will still run in 1st gear so I'm reluctant to delve further incase I leave all drive.

 

Any ideas what may have caused this to fail like this or what the problem is? I assume it's a rebuild/replacement job.

Do not remove the last bolt as there are some large springs in there and are a PITA to put back with the box still in place!

The bolts always seem to sheer for some reason.

if you cant fix it yourself take it to a gearbox specialist.

You should have nothing stuck to the magnet and the oil should not have been black or light brown and the oil should have been changed at regular intervals.

Best of luck!

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  • 3 weeks later...

Pleased to say my local transmission specialist JR Transmissions in North Camp (near Farnborough, Hants) sorted it out by tapping the sheared bolt shafts out of the housing & refitting a new servo/piston assembly, as I'd hoped without removing the gearbox. All in cost including oil/gaskets/piston/VAT & labour of £206. Large sigh of relief from yours truely. 113K on the box & still going (strong??), time will tell.....

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Pleased to say my local transmission specialist JR Transmissions in North Camp (near Farnborough, Hants) sorted it out by tapping the sheared bolt shafts out of the housing & refitting a new servo/piston assembly, as I'd hoped without removing the gearbox. All in cost including oil/gaskets/piston/VAT & labour of £206. Large sigh of relief from yours truely. 113K on the box & still going (strong??), time will tell.....

 

 

nice one mate, that was not only incredibly lucky not to be a serious problem but also a good price for the work done. im not the only one who had to fork out a 4-figure sum to either fix the autobox or convert to a manual. good luck and i hope she behaves herself from now on!

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