Vehicle & Technical > Series Land Rovers

Series III Gearbox

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Spyderman:
I've got a 1981 Series III Diesel. It jumps out of 1st & 2nd gear when it is not under load. What is the easiest fix? Is it best just to find another box and put that in or is a repair fairly straightforward. Excuse me, but gearboxes to me are Witchcraft.

Les Henson:
Drain the oil out of the gearbox and look for bits of metal. Depending on what comes out will determine the extent of your problem. If flat bits of sprung steel comes out (blue coloured), then one of your synchro hub springs has busted - this is quite common, but requires the gearbox to be removed from the vehicle. I vaguely remember someone posting in the distant past that you could do it with the gearbox in, but I've never tried. 1at though you need to check the gear lever for wear at the bottom where it engages in the selector rods, then the detent balls in the top cover, then the selector forks. These last three can be checked with the gearbox still in the vehicle.


Les.

Lucy1978:
It's quite a common problem, the syncros on 1st and 2nd are a weak point, the tabs that engage in the syncroniser wear and push it out of gear.

It's a gearbox out job to replace the syncro rings but they're only a few quid each,  the bit they sit into is about 30 quid though.

Chris

lotusandy:

--- Quote from: "Les Henson" ---Drain the oil out of the gearbox and look for bits of metal. Depending on what comes out will determine the extent of your problem. If flat bits of sprung steel comes out (blue coloured), then one of your synchro hub springs has busted - this is quite common, but requires the gearbox to be removed from the vehicle. I vaguely remember someone posting in the distant past that you could do it with the gearbox in, but I've never tried. 1at though you need to check the gear lever for wear at the bottom where it engages in the selector rods, then the detent balls in the top cover, then the selector forks. These last three can be checked with the gearbox still in the vehicle.


Les.
--- End quote ---


I have a series 3 that has done 91,000 miles, the gearbox & synchro is fine, but finding first gear is very hard, is it likely to be a matter of renewing the detent balls selector forks and gear lever? if so how easy is it to do this? I am pretty able mechanically, but just not experienced in Landy gearboxes!

Thanks Andy

Lucy1978:

--- Quote ---I have a series 3 that has done 91,000 miles, the gearbox & synchro is fine, but finding first gear is very hard, is it likely to be a matter of renewing the detent balls selector forks and gear lever? if so how easy is it to do this? I am pretty able mechanically, but just not experienced in Landy gearboxes!
--- End quote ---


take the floor, the seatbox and the transmission tunnel out and you can get to the top of the box. you ca then remove the detent springs for the 3rd/4th and reverse selectors, two L shaped brackets, one on each side of the gearbox. next you can remove the top of the box the detent ball and spring for 1st/2nd are beneath the brass plug in the top cover so be carefull when removing the top of the gearbox.

you should now be able to see the selector rods and the 3rd/4th selector fork, they look something like this;

the reverse selector is missing in the photo, 1st/2nd is the one closest to the camera.

Check the positions of the forks on the rods with the measurements given in the manual.  You can remove the selectors, it's a little bit fiddly but not too difficult.  If this looks ok, it's likely it's something to do with the 1st/2nd syncroniser unit.  to change this is a gearbox out job.

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