HJ60 doesn't shift on 2nd gear from 3rd gear while vehicle is moving

Submitted: Thursday, Aug 08, 2013 at 22:36
ThreadID: 103680 Views:2230 Replies:5 FollowUps:5
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I have HJ60 1986 with 12HT engine with 5 speed maunual gear.

The gear doesn't shift from 3rd to 2nd gear but seems ok to shift from 1st to 2nd provided i do this quickly otherwise it doesnt shift on 2nd gear after a pause and also doesnt shift from 3rd gear to 2nd gear. It shifts easily to all other gear except 2nd gear while vehicle is moving.

Would someone please let me know what to look for to correct this fault.

regards
Naveed
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Reply By: Pathycop - Friday, Aug 09, 2013 at 01:33

Friday, Aug 09, 2013 at 01:33
Hi

I had this issue once on an 80 series diesel particularly when trying to shift down into second. In my case, it was caused by a mechanic putting the wrong grade oil in the gearbox!!

Changed to correct oil and it was perfect again.

Have you tried an oil change??

Graeme

AnswerID: 516111

Reply By: PeterInSa - Friday, Aug 09, 2013 at 09:30

Friday, Aug 09, 2013 at 09:30
To me it could be a gear linkage adjustment need.

As suggested above I would also look at an oil change and ensure the correct grade of oil is used. Would also consider adding Nulon G70 oil additive to the gearbox. This stuff, according to the write up on the tube.
Reduces Noise and Friction
Easier Gear changes
Proven to reduce wear by 50%.

I use G70 in the manual gearbox of our cruiser and also in the limited slip diff.

Nulon should be on the Net, look the the details of G70 up.

Peter
No connection with Nulon other than a customer
AnswerID: 516129

Follow Up By: PeterInSa - Friday, Aug 09, 2013 at 09:32

Friday, Aug 09, 2013 at 09:32
Correction

Proven to reduce wear by up to 50%

Peter
0
FollowupID: 795428

Follow Up By: Ross M - Friday, Aug 09, 2013 at 11:46

Friday, Aug 09, 2013 at 11:46
There is NO gear linkage adjustment, nil, zero, zilch. Doesn't exist.


Nulon is Teflon and is friction reducing.
For a LSD to work, the friction plates have to be able to grip in order to drive the wheel with traction. same as for an auto box to have it's plates grip to provide torque transmission.
A Toyota LSD is usually not very effective anyway and after lots of Ks is as good as an open diff. Nulon will most likely make it more like an open diff as it will aid the reduction of friction and make an LSD into a no LSD.
The additive put in normal diff oil so it is suitable for and LSD is to make the oil film break down in sliding type action so the plates can grip. Nulon provides less ability to break down the film for gripping to occur.

In a gearbox with good synchros OK, with poor synchros ie second, Nulon won't help as the baulk ring in the synchro system will stay baulked because it cant grip the matching cone to synchronize the speeds of the two items.

Ross M
1
FollowupID: 795437

Reply By: Ross M - Friday, Aug 09, 2013 at 11:54

Friday, Aug 09, 2013 at 11:54
Check the clutch fork release bearing freeplay. It may be, the clutch (not the clutch pedal) isn't being pressed in far enough and clutch drag is making the gearbox continuing to receive some drive torque and the synchro on second therefore cannot work against the continual drive to allow the synchro drive ring/baulk ring to bring the speeds to the same so it will blockthe gear from being changed.

Check to see if too much release fork freeplay.

Synchro may be stuffed. Gearbox oil could be incorrect.
AnswerID: 516142

Follow Up By: Member - mechpete - Friday, Aug 09, 2013 at 13:03

Friday, Aug 09, 2013 at 13:03
the easiest way to check the clutch , is to put it into reverse .
as it is not synchromesh it will crunch excessively , if it won,t go in within a couple of seconds its a clutch related problem ,
cheers mechpete
1
FollowupID: 795439

Follow Up By: Ross M - Friday, Aug 09, 2013 at 15:00

Friday, Aug 09, 2013 at 15:00
mechpete
Yes, that will check it out as it is the only ratio/gear which you actually change, 1,2,3,4,5th are not gearchanges at all.
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FollowupID: 795446

Reply By: Dave B ( BHQ NSW) - Friday, Aug 09, 2013 at 13:57

Friday, Aug 09, 2013 at 13:57
I am using Castrol VMX-M and the gearchange is far quicker and smoother with this oil.

cheers

Dave
'Wouldn't be dead for quids'

Lifetime Member
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AnswerID: 516145

Reply By: Mark H16 - Friday, Aug 09, 2013 at 19:10

Friday, Aug 09, 2013 at 19:10
These gearboxes have the nylon bush at the base of the gearstick (where it enters the top of the gearbox) disintegrate and make gear selection difficult. I would be checking that before doing anything else.
AnswerID: 516152

Follow Up By: splits - Friday, Aug 09, 2013 at 20:08

Friday, Aug 09, 2013 at 20:08
That would be the first thing I would check. It was a problem when they were new and I must have fixed a dozen under warranty. The plastic seat breaks up and allows the gear lever to sink deeper into the box causing binding in the selecters.
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FollowupID: 795462

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