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TopQ1967

Member Since: 14 Feb 2012
Location: Veghel
Posts: 236

2012 Defender 130 Puma 2.2 HCPU Buckingham Blue

Traction front without rear prop?

Hi

Checking my transfer box (as I see drips from the Ashcroft main shaft and hear a crunch when de oil is warm).

Removed the rear prop. Wanted to move the car 10 inch so I can easy get the front bolts from the prop out.
But I have no traction at all. I see the rear prop spinning.. when engaged the central diff nothing is happening (no traction). I do have a Ashcroft central diff too.

Is this normal?

Regards

Q.

15th Jun 2017 5:38pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17382

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

With the centre diff lock engaged you should be able to drive the vehicle with the rear propshaft removed.

Check the diff lock light is illuminated. For some reason your lock is not engaging.

15th Jun 2017 5:55pm

TopQ1967

Member Since: 14 Feb 2012
Location: Veghel
Posts: 236

Diff lock light is on.

So leveler is working. But no traction.

What to check next?

Otherwise I start removing the transfer box.

15th Jun 2017 6:43pm

rallysteve

Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2227

2002 Defender 110 Td5 DCPU Keswick Green

If you have an ashcroft atb centre diff it will not transfer torque to the front it the rear is spinning with no load.

This is a characteristic of the atb rather than an lsd.
Lightly applying the handbrake should allow it to drive. Be warned that with a centre atb jacking the vehicle can be very dangerous as you cannot lock the ddiff as you could as standard. Therefore always use a wheel (good) chock.
Steve 02' 110 TD5 Double Cab Rebuild Thread

15th Jun 2017 8:24pm

TopQ1967

Member Since: 14 Feb 2012
Location: Veghel
Posts: 236

Thank you Steve

Didn't know a Ashcroft diff was not lockable.
Then this probably right.
I have removed the transfer box tonight. Will check it tomorrow.
At first sight it looked if there was alloy in the oil.. so a bearing is spinning in the housing or something is not fitted right.

15th Jun 2017 9:00pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17382

The Ashcroft centre ATB diff is lockable:

Ashcroft Transmissions wrote:
Note the ATB centre can still be locked like the stock unit when required, locking the diff is still advised when prolonged wheel spin is anticipated.

See http://www.ashcroft-transmissions.co.uk/di...-diff.html

It seems that you have a significant fault.

15th Jun 2017 9:31pm

rallysteve

Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2227

Interesting, thanks for that Blackwolf!

Steve 02' 110 TD5 Double Cab Rebuild Thread

15th Jun 2017 9:58pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17382

I've always thought it a shame that there isn't a version of the Ashcroft ATB that includes a full lock capability, technically it is feasible. That would be the ultimate axle diff!

15th Jun 2017 10:03pm

pannawonica

Member Since: 21 Nov 2010
Location: Clackline Western Australia
Posts: 568

Too right BLackwolf, getting much further than with open diffs then selecting lock to proceeed or retreat!

16th Jun 2017 10:22am

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