'Manual' diff lock

[Leo109]

Hi All,

A current thread about Jac Mac diff locks has prompted me to ask if anyone has, or has seen, a 'manual' JM difflock on a Series Salisbury axle.

I believe the lock is engaged/disengaged by turning a hex 'nut' on one rear hub (presumable driver's side?) I like this idea - no hassles with vacuum/pressure systems, etc.

A "normally reliable source" told me about these some years ago but I've never seen one or heard about them elsewhere. Fact or fiction?

If they do exist, any clues where I might find one?

[incisor]

have seen them on series "rover" diffs, not seen a "salisbury" version...

be interested to hear if they were ever done for them....

[rangieman]

A mate of mine had a S111 LWB (salsbury diff) years ago that had the manual locking Jmac diff lock;)

Worked well except if it was wet and muddy , which meant you ended up the same:D

[mcrover]

Ive seen a 2a with one but doesnt work for some reason turns but doesnt lock.

The 2a is on a golf course and Im trying to get it out of them.

[cmurray]

Ive seen a 2a with one but doesnt work for some reason turns but doesnt lock.

One of my series 1's has one. When I used it, I would pull the bolt right out. I had a bigger bolt that would screw into the housing, instead of the end of the axle to seal it all up, and the bolt was long enough to that you couldn't screw it all the way in until the axle had slid across to lock the diff.

Also, I can remember seeing one on a Stage 1 V8 many years ago.

[mcrover]

One of my series 1's has one. When I used it, I would pull the bolt right out. I had a bigger bolt that would screw into the housing, instead of the end of the axle to seal it all up, and the bolt was long enough to that you couldn't screw it all the way in until the axle had slid across to lock the diff.

Also, I can remember seeing one on a Stage 1 V8 many years ago.

So the bolt is too short then I take it, I thought there may have been something worn inside that doesnt enguage as the bolt head goes about 1 1/2 turns both ways but nothing locks inside.

[rovercare]

So the bolt is too short then I take it, I thought there may have been something worn inside that doesnt enguage as the bolt head goes about 1 1/2 turns both ways but nothing locks inside.


1.5 turns, hahah, think about it, your a mechanic, what would that achieve?:p

The bolt needs to be long enough to push the axle through into the locking spline;)

[Killer]

I have one on a series III with a Rover axle, works fine.

Cheers, Mick.

[Disco_kid]

Don't the Early D2's have this as well? More along the lines of an actual manual diff lock (turn screw here to lock hub here) kind of thing?

[cmurray]

So the bolt is too short then I take it, I thought there may have been something worn inside that doesnt enguage as the bolt head goes about 1 1/2 turns both ways but nothing locks inside.

Pull the bolt completely out! To give you an idea of how the diff lock works, the short axle has extra long splines on both ends, and is spring loaded to push it into the splined cross shaft in the diff. The bolt holds the axle out of the cross shaft so it stays unlocked. When you undo the bolt enough, or remove it completely, the axle slides into the cross shaft when the splines line up locking the diff. I ended up always jacking the wheel up to unlock it, as the wind up in the diff would make it quite difficult some times, and I noticed that the bolt was starting to stretch a bit. Also, you can actually hear these things lock, there will be a bit of a clonk from the rear axle when it does.

[cmurray]

Don't the Early D2's have this as well? More along the lines of an actual manual diff lock (turn screw here to lock hub here) kind of thing?

No, this is an axle diff lock, not a centre diff lock or a free wheeling hub. They are easy to spot, as the drivers side rear drive flange has a large hex thingo sticking a few inches out of it, good for banging shins on!

[p38arover]

I nearly purchased a County that had one of these so that would have been on a Salisbury.

[cmurray]

Stumbled across this which may help.
https://www.aulro.com/afvb/images/imported/2016/02/327.jpg

[Leo109]

Thanks for the info, guys. Now that I know they definitely exist, I want one! Anyone know of Salisbury with one of these for sale?