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Front diff seems disengaged


 
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antcole
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Joined: 04 Jan 2014
Posts: 31
Location: Devon

PostPosted: Mon Jul 01, 2019 19:39    Post subject: Front diff seems disengaged Reply with quote

Hello...
Recently while climbing about under my 80, I gave the front propshaft a turn and noticed it would turn fully with all the wheels firmly on the ground....
Unless I'm missing some detail here, shouldn't it be connected to gears that would make that impossible?
I've heard of front diffs failing on these but wondered if there was some sort of jiggery pokery in that actuator bolted on the diff that has disengaged the drive....?
Any advice or enlightenment is greatly appreciated...  Very Happy
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PostPosted: Mon Jul 01, 2019 19:39    Post subject: Google Ads keep this community free to join!


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RADIOTWO
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Joined: 18 Nov 2005
Posts: 812
Location: GLOSSOP

PostPosted: Tue Jul 02, 2019 10:12    Post subject: Re: Front diff seems disengaged Reply with quote

antcole wrote:
Hello...
Recently while climbing about under my 80, I gave the front propshaft a turn and noticed it would turn fully with all the wheels firmly on the ground....
Unless I'm missing some detail here, shouldn't it be connected to gears that would make that impossible?
I've heard of front diffs failing on these but wondered if there was some sort of jiggery pokery in that actuator bolted on the diff that has disengaged the drive....?
Any advice or enlightenment is greatly appreciated...  Very Happy

I don't know about the 80 series but dose not have Locking hubs, also known as free wheeling hubs are fitted to some (mainly older) four-wheel drive vehicles, allowing the front wheels to rotate freely when disconnected (unlocked) from the front axle.?
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Steve
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antcole
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Joined: 04 Jan 2014
Posts: 31
Location: Devon

PostPosted: Tue Jul 02, 2019 10:43    Post subject: Reply with quote

Thanks for the reply!
It doesn't have free wheel hub locks. It's permanent 4wd.
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RADIOTWO
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Joined: 18 Nov 2005
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PostPosted: Tue Jul 02, 2019 13:08    Post subject: Reply with quote

antcole wrote:
Thanks for the reply!
It doesn't have free wheel hub locks. It's permanent 4wd.

Are you sure it has not got them ? and
how do you know it is permanent 4wd,
how have you proved it ?
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Steve
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antcole
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Joined: 04 Jan 2014
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Location: Devon

PostPosted: Tue Jul 02, 2019 13:56    Post subject: Reply with quote

I've engaged the 4L on the transfer box on a track before and it seemed to work, although I've never seen all 4 wheels spinning....
There definitely no locks on the wheels, I know what they look like and mine just have the dust caps over the hub end.
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RADIOTWO
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Joined: 18 Nov 2005
Posts: 812
Location: GLOSSOP

PostPosted: Tue Jul 02, 2019 15:17    Post subject: Reply with quote

antcole wrote:
I've engaged the 4L on the transfer box on a track before and it seemed to work, although I've never seen all 4 wheels spinning....
There definitely no locks on the wheels, I know what they look like and mine just have the dust caps over the hub end.


OK, As I am not a expert but going on your symptoms, it is the only thing I can think could cause the problem.
Has the 80 got a centre diff lock ?
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antcole
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Joined: 04 Jan 2014
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Location: Devon

PostPosted: Tue Jul 02, 2019 17:03    Post subject: Reply with quote

I think it does have the centre diff lock, but that said, the propahaft downstream of it should be engaged with the crown wheel... I'm sort of dreading opening it all up and finding a mass of empty spaces where once many teeth existed  Very Happy
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Roger Fairclough
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Joined: 24 Oct 2007
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Location: Redditch Worcestershire

PostPosted: Tue Jul 02, 2019 21:46    Post subject: Reply with quote

Likely culprit would be drive shaft to hub flange. Remove each cap and look for bits of metal.

Roger
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russell.huffer
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Joined: 16 Dec 2017
Posts: 44
Location: Hertfordshire

PostPosted: Wed Jul 03, 2019 12:13    Post subject: Reply with quote

Due to the nature of drive taking the path of least resistance, if a driveshaft has broken then the only way to drive the vehicle would be with the centre diff locked. Is this a manual and when you turned the prop the gearbox was in neutral or is this an auto in which case should have been in park which would stop the prop turning. Even with no drive shafts you should not be able to turn the props in gear or park.

Kind regards


Russell.
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