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4wd simply doesn't work....

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18 Jan 2018 07:27 #188506 by florinelu07
4wd simply doesn't work.... was created by florinelu07
Hi all,

I'm having some issues wiht my 2005 VVT Jimny, Button operated transfer box...

4x4h light comes up when button pressed - tranfer case "wuzz" sound can be heard, also hubs "clonk", and light turns solid green.
4x4L aloso engages with no errors.
When going back to 2x4H a firm mechanical "clonk" whith a bit of a shock come out from the front axle while switching when driving.

... then come the funny part - considering that I'm getting poor traction on snow/mud/wet grass, I've looked for traction marks on the ground and to my surprise the front wheels don't have traction. Rear wheels turn like crazy - front ones ZERO.

Any ideas about how to check the system without full dissasembly?

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18 Jan 2018 08:07 #188507 by Lambert
Replied by Lambert on topic 4wd simply doesn't work....
Switch on the car engage 4x4, turn off car, lift one front wheel, it should rotate a few degrees and stop, repeat on other side. If it does fully rotate then listen for any clunky or scraping or metallic noises as they could indicate cv joint or differential problemsand will require deeper investigation.

Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
ADOS Attention Deficit Ooooh Shiny!

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18 Jan 2018 08:36 - 18 Jan 2018 08:53 #188508 by florinelu07
Replied by florinelu07 on topic 4wd simply doesn't work....
Already tested on both sides and the wheels are turning but I would say that this is normal given that the diff is transferring the friction from the wheel on ground to the one suspended. Am I right?

If manually spinning the wheel, when 4x4H is engaged, it blocks the wheel for a moment therefore something happens in the hubs.

I'm thinking of the following test:

- raise front axle from the ground (wheels suspended)
- in 2x4 mode:
- spin each wheel - expected result is that each wheel spins freely without diff and prop shaft to transfer case engaged (confirmation that
transfer case and hubs are disconnected)
- if opposite, than hubs and/or diff has issues

- in 4x4h mode:
- try/rotate manually the front prop shaft - expected result is that only few degrees of rotation will be obtained (confirmation that front prop is engaged) - if opposite, than transfer box fails to engage front shaft
- spin each wheel - expected result is that the opposite wheel should turn in reverse (confirmation that diff/rod(s) are working and hubs are locked) - if opposite, that hub(s) are faulty and/or diff is damaged and/or broken rod(s)
- spin both wheels at the same time and same direction - expected result is that prop shaft should turn and if connection is made to the
transfer case, the wheels will rotate only few degrees (confirmation that hubs are locked, diffs and prop engaged). - if opposite, than diff and rod(s) are damaged.

Logically speaking, these should be the simplest way to detect eventual malfunctions.
Last edit: 18 Jan 2018 08:53 by florinelu07.

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18 Jan 2018 08:56 #188509 by Lambert
Replied by Lambert on topic 4wd simply doesn't work....
If in 4x4 and in gear with one wheel up and 3 down you can rotate the lifted wheel you have a problem and need to start looking deeper, hubs not engaged damage to cv joint, diff or transfer box.

Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
ADOS Attention Deficit Ooooh Shiny!

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18 Jan 2018 09:05 #188510 by florinelu07
Replied by florinelu07 on topic 4wd simply doesn't work....
According to the diff principle, the raised wheel should rotate, except the situation when a diff locker is in place.
that's the point of the diff...

Am I missing something? :dry:

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18 Jan 2018 09:49 #188511 by mlines

florinelu07 wrote: According to the diff principle, the raised wheel should rotate, except the situation when a diff locker is in place.
that's the point of the diff...

Am I missing something? :dry:

Yes, differential relies on difference! If the input and other wheel is held then the free wheel cannot rotate either

Sent from my Nexus 6P using Tapatalk

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
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18 Jan 2018 09:54 #188512 by Lambert
Replied by Lambert on topic 4wd simply doesn't work....
Yes. The propshaft can't rotate because of the transfer box not having a diff and neither can one wheel so therefore the diff is unable to rotate around either the crown wheel nor the planet or sun wheels effectively locking the remaining wheel. It's how a diff has to work.

Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
ADOS Attention Deficit Ooooh Shiny!

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18 Jan 2018 09:58 #188513 by florinelu07
Replied by florinelu07 on topic 4wd simply doesn't work....
Understood.

Thanks for your patience....

So at a first look that the hubs are not engaging (or a least one).

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18 Jan 2018 10:07 #188514 by Lambert
Replied by Lambert on topic 4wd simply doesn't work....
Correct

Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
ADOS Attention Deficit Ooooh Shiny!
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18 Jan 2018 10:22 #188515 by florinelu07
Replied by florinelu07 on topic 4wd simply doesn't work....
Given that I'll have to remove them from the car, do you have any recommendations regarding the cleaning and greasing procedure of the locking hubs?

Recommended lubricant?

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18 Jan 2018 10:30 #188516 by Lambert
Replied by Lambert on topic 4wd simply doesn't work....
Therr might be a specific grease but I just used a little bit of the waterproof one i use on the kingpins, only a little bit though, just a dab will do.

Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
ADOS Attention Deficit Ooooh Shiny!

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18 Jan 2018 11:11 - 18 Jan 2018 11:12 #188517 by florinelu07
Replied by florinelu07 on topic 4wd simply doesn't work....
and hopefully the last question: which vacuum tube goes into the upper position into the wheel hub? VSV2 (locking) or VSV1(unlocking)
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Last edit: 18 Jan 2018 11:12 by florinelu07.

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