Front and rear diff locks?

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Front and rear diff locks?

Postby Bobreoc » 05 Jun 2018, 07:24

Hi all.

I’ve tried a search on here and google but can’t find what I’m looking for.
How do I physically test that the front and rear diff locks are actually engaging? I’ve found troubelshott on finding air leaks etc but I want to physically test they are locking.

If there is already a thread could somone please help and point me in the tight direction.

thanks
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Re: Front and rear diff locks?

Postby Gary. » 05 Jun 2018, 08:19

I just jacked up both rear wheels (then front), when you rotate one side by hand it should engage. You will then find they turn slowly under the resistance of the VC.

That's a reminder as my rear diff lock is too stiff to engage via the pneumatics.
Gary.

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Re: Front and rear diff locks?

Postby Bobreoc » 05 Jun 2018, 08:45

Cheers Gary.

Simple enough thank you.

New syncro owner so learning as I go.. the lights on the dash don’t illuminate so need to now check wether that actually engage.
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Re: Front and rear diff locks?

Postby Aidan » 05 Jun 2018, 10:01

jack up one side both front and rear :ok
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Re: Front and rear diff locks?

Postby Bobreoc » 05 Jun 2018, 16:43

So tested the front and rear by jacking the wheelS

Started with the rear offside and tried to spin the wheel without engaging the diff, it’s locked like it was in gear (could only rock it back and forth a little). I tried pulling the lever for the rear diff and nothing changed.. still rocked back and forth the same.

I then jacked the front offsideI did the same with the front and wheel felt like it was in gear same as the back,I engaged the diff and the wheel locked up further like it was nearly solid, so I assume the front diff is working ok.

What I didn’t understand is that before I pulled the lever for the front diff the prop shaft was rocking back and forth with the wheel, does this me the vc is not working?

Sorry for the beginner questions.
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Re: Front and rear diff locks?

Postby irishkeet » 06 Jun 2018, 06:27

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Re: Front and rear diff locks?

Postby Bobreoc » 06 Jun 2018, 10:03

Cheers.

After testing last night, I now know the vc is working.
The front diff is working.
But the rear is not working and either seized or the actuator is broken.

Thanks again.
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Re: Front and rear diff locks?

Postby Gary. » 06 Jun 2018, 10:23

It's probably seized. You can remove the actuator quite easily and test. There is an aluminium collet that seems to corrode and jamb the actuator pin. I got mine moving, but not free enough for the actuator to operate it.
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Re: Front and rear diff locks?

Postby Bobreoc » 07 Jun 2018, 08:23

Gary. wrote:It's probably seized. You can remove the actuator quite easily and test. There is an aluminium collet that seems to corrode and jamb the actuator pin. I got mine moving, but not free enough for the actuator to operate it.


Cheers Gary.

Yes by the look of it I just have to remove the cv to gain access.. with a house this weekend I won’t get time until next week.

Here’s hoping it’s just seized.

Rob
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Re: Front and rear diff locks?

Postby Gary. » 07 Jun 2018, 09:10

Bobreoc wrote:
Gary. wrote:It's probably seized. You can remove the actuator quite easily and test. There is an aluminium collet that seems to corrode and jamb the actuator pin. I got mine moving, but not free enough for the actuator to operate it.


Cheers Gary.

Yes by the look of it I just have to remove the cv to gain access.. with a house this weekend I won’t get time until next week.

Here’s hoping it’s just seized.

Rob


I didn't remove any other parts. Just get under there and removed the two long thin bolts, they'll probably have corroded nuts on the ends (7-8mm?) Brickwerks do replacements. Then there is a pin holding the actuator to the shafts...

Image
Last edited by Gary. on 07 Jun 2018, 15:38, edited 1 time in total.
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Re: Front and rear diff locks?

Postby silverbullet » 07 Jun 2018, 15:14

A white dust sheet on the ground helps you recover the pin after you have driven it out ;)

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Re: Front and rear diff locks?

Postby toomanytoys » 15 Jun 2018, 23:48

Or place a reasonable magnet on a stick close to the pins exit hole and catch it that way.

On replacing the pin. Ensure it’s not sticking out either side as this will stop the actuator form sliding in too. Common mistake.
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