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LJ70 Gearbox Issues


 
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gus2010
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Joined: 18 Oct 2004
Posts: 43
Location: Aberdeen UK, work Saudi, soon Australia

PostPosted: Sat Dec 22, 2018 16:26    Post subject: LJ70 Gearbox Issues Reply with quote

So....
Running my 1991 LJ70 again for the first time in several years.
Just drove it 160 miles from Aberdeen to parents house.

Running sweetly, but gearbox is a bit of a problem child.
It runs through the gears easily with the engine off and the clutch either in or out, so I don't think there is an issue with the linkages.

But once running, gearchanges are difficult.
Can't find the gates without a lot of crunching.
I think it is the synchro?

New oil was put into both gearboxes and the diffs, before any driving, so that is all fresh.
The clutch is fine too.

Someone has told me that after a long while lying idle this can happen, but will often sort itself out?
But if not then changing the oil for Automatic transmission oil (which has different fluid characteristics) will usually solve the problem.
However, popped into the local Toyota dealer who (unsurprisingly) said that the only solution was a full gearbox strip down and rebuild.

I don't trust anyone local to do this and don't want to go down this route unless it is truly my only option.
I'm still planning to drive the vehicle from Scotland to Anglesey on the 29th where it will remain at my sister's place.

The engine is torquey enough that I can pull away in 2nd from standstill without issues, and then at slightly higher speed and revs than normal, slip it cleanly into 4th.
Providing the vehicle is rolling at about 60, and preferably under low load (eg downhill) I can then mostly get it into 5th and then roll for miles like that.
So I should be able to get the journey to Anglesey done hopefully without too much stress.
But running it long term like that will just cause damage (and even more expense) to the box.

So, I'm asking the brains' trust on this forum, two things:

1.  Are there any low cost solutions that have a chance of solving this problem?
2.  If not, can anyone recommend a specialised gearbox place local to Anglesey, or within say 100miles of Anglesey, that would do a good job of this for a reasonable cost?


As always, thanks in advance to everyone reading / responding to my plea !
Regards,
Angus
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PostPosted: Sat Dec 22, 2018 16:26    Post subject: Google Ads keep this community free to join!


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Roger Fairclough
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Joined: 24 Oct 2007
Posts: 1619
Location: Redditch Worcestershire

PostPosted: Tue Dec 25, 2018 21:31    Post subject: Reply with quote

The gear lever pivots on a nylon bearing which sometimes breaks up. This restricts gear changing. You need to remove the tray around the gear lever to access the top of the box to remove the lever. Should take about an hour at most. The nylon bearing is available on it,s own. Worth a check.

Roger
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gus2010
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Joined: 18 Oct 2004
Posts: 43
Location: Aberdeen UK, work Saudi, soon Australia

PostPosted: Thu Jan 24, 2019 14:43    Post subject: Follow Up Reply with quote

OK, so... it's pretty much terminal.  
I put the vehicle into a specialist gearbox centre.  'box has been run with insufficient lube at some time (was full when they stripped it down though).  So Input Driveshaft and Layshaft need replacement, and at the same time they will change some of the bearings in the box in general and most / all of the synchros.  Having problems sourcing the shafts.  Apparently at least one component is no longer made.  Donor box would be an option, but nothing readily available on the usual places so far.  Looking as far afield as Australia (where i work).

Part numbers are Lay Shaft 33421-35120 (which MAY have been superseded by 33421-60151, but I'm not certain), may also be known as the Counter Gear?
and Input Shaft 33301-35090.

Anybody know of any place that has a stock of New Old Stock Toyota Drive Train bits?
I almost got lucky on Australian e bay but the part numbers were different and they won't fit.

Anybody got any ideas? Sources?
Thanks,
Angus
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andy
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Joined: 16 Dec 2003
Posts: 2107
Location: Polegate, Sussex, England.

PostPosted: Thu Jan 24, 2019 16:16    Post subject: Reply with quote

Have you tried http://www.euro4x4parts.com/parts/vfv1024-0_layshaft_cluster_gear_33421-60151.html
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It's Not a Bl**dy Jeep it's a Landcruiser
150 series Invincible X
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1993 VX80 4.2td SOLD
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andy
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Joined: 16 Dec 2003
Posts: 2107
Location: Polegate, Sussex, England.

PostPosted: Thu Jan 24, 2019 18:48    Post subject: Reply with quote

Or another one https://www.amayama.com/en/genuine-catalogs/toyota
_________________
It's Not a Bl**dy Jeep it's a Landcruiser
150 series Invincible X
100 Series VX Limited
Mercedes Sprinter 311 Luton
1993 VX80 4.2td SOLD
1996 Hilux Surf SSR-G Intercooler Sold
1994 Hilux Surf SSR-V Sold
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gus2010
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Joined: 18 Oct 2004
Posts: 43
Location: Aberdeen UK, work Saudi, soon Australia

PostPosted: Wed Apr 10, 2019 14:24    Post subject: Follow up Reply with quote

Oh, dear lord, what a nightmare,
Thank you all for your help.  I ordered both parts from Euro4x4, who were very helpful, but one part was wrong and the other part should have fitted but didn't.  Thankfully Euro4x4 promised that if if the parts weren't right they would take them back, and they have.

The gearbox specialist have been amazing, and gone to enormous lengths to try to source the parts, but have come up blank.  As have I - I didn't take the risk of the other recommendation because at about $500 each shaft, I didn't want to end up with an incorrect part I couldn't return.

The gearbox specialist have suggested that the 'box fitted might be a hybrid, because it is different to what it "should" be, ie the number of teeth on the gears are not as the available spares indicate they should be.

For example:
The teeth count on the lay shaft that came out of the gearbox are:  1st=11, 2nd=21, 3rd=32, 4th=43, R=13 (5th must be engaged in a different way)
But the teeth count on the shaft from Euro4x4 is:  1st=12, 2nd=23, other gears the same so far as I know.
With these differences, the gearbox could not be rebuilt, and is little better than what it was.
This is a disastrous result for me.
Does anyone know any explanation for this?

I'll add more info as I collate it from various sources.
Thank you,
Angus
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