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#Post#: 98502--------------------------------------------------
jumping out of gear
By: bim simcoe Date: July 26, 2015, 8:32 am
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hi all
any one know why g/box jumps out of 2nd on over run .presume it
is the syncro.how to fix? does the g/box have to come out?
cheers
bim
ps indent springs etc all good
#Post#: 98513--------------------------------------------------
Re: jumping out of gear
By: NoelC Date: July 27, 2015, 3:58 am
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Bim, is this on your '64 2a? If so a gearbox number would help,
as that shouldn't have syncro on 1st and 2nd gear.
#Post#: 98519--------------------------------------------------
Re: jumping out of gear
By: Serious Series Date: July 27, 2015, 12:38 pm
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Is the nut tight on the rear of mainshaft ie under the cover at
the passenger side of transfer case.
#Post#: 98523--------------------------------------------------
Re: jumping out of gear
By: Roveerman Date: July 27, 2015, 4:02 pm
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I'm sure someone will come along and say "it's the indent
springs on the selector shaft", as for the syncro that is only
to get the gear set spinning at the same speed to make it easier
to engage.
As Noel says gearbox number is needed, if yours is non syncro
between 1st and 2nd it's very like the series 1 box I did a few
years back with the same issue, the second and third gear set on
the main shaft sit on a bronze bush that has a thrust washer
between the gears, as this washer wears the main shaft gears can
move back and forth and on overrun throw the box into neutral.
The only way to find out what is wrong is to remove the box and
strip it, there is a problem and it needs fixing, bite the
bullet, crack on, spend some money on some bits and end up with
a box you can trust.
Good luck
#Post#: 98532--------------------------------------------------
Re: jumping out of gear
By: spitfiremk1uk Date: July 28, 2015, 4:10 pm
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Assuming the gearbox was set up properly in the first place
there are only 2 real reasons a gearbox will jump out of gear.
Excessive end float on the gear set allowing movement often
caused by alternate drive/overun loadings
or
Worn dog teeth on the affected gear.
On older gearboxes these issues often combine!
As has been suggested. Detent springs are for accurate gear
running alignment and do not hold gears together/in mesh.
It is not impossible for the mainshaft nut to be very loose
allowing excessive movement which causes a situation where the
gear selector forks actually tries to disengage the selected
gear but you should notice huge amounts of backlash. Might be
worth a quick check and pull the inspection plate on the top of
your tranny box first just to check it for tightness though.
#Post#: 98537--------------------------------------------------
Re: jumping out of gear
By: Doug_T Date: July 29, 2015, 12:52 pm
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If you have an overdrive fitted you need to remove it to check
the nut in question. Furthermore if you do have a lot of
endfloat on the mainshaft and it goes unchecked, then it doesn't
do the bearings on the back of the overdrive mainshaft any good.
#Post#: 98559--------------------------------------------------
Re: jumping out of gear
By: bim simcoe Date: August 2, 2015, 8:06 am
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thanks all later type g/box looks like take out job
bim
#Post#: 98577--------------------------------------------------
Re: jumping out of gear
By: spanner rash Date: August 3, 2015, 7:04 pm
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Hi Bim, my 2a gearbox started misbehaving by jumping out of 2nd
on overrun/downhill and then eventually refused at times to
change gear at all. On removal found that not only the dog teeth
were worn but the the mainshaft bronze bush had broken into 3
pieces making meaningful endfloat irrelevant (even the locating
peg had sheared) Parts not too expensive, more a faff setting up
the right thrust washers etc...
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