Thats a Macnamara manual locking diff
You actually wind the long bolt in to unlock it
Is anyone familiar with the locking diffs fitted to series 3 landrovers (sals diffs)? They have a large hex extension on the drivers side hub with a nut you wind in apparently to lock the rear diff.
Who manufactured them? Or are they a Rover part?
Are they particularly rare/sought after?
What are the benefits to be gained? I'm not a serious off roader and I understand they are more for this usage? I'm not really on the up and up as far as the purpose of a locking diff or the applications for them (call me dumb if you like)
Thats a Macnamara manual locking diff
You actually wind the long bolt in to unlock it
Available for both rover and sals AFAIK. They pop up for sale from time to time. They were simple and cheap - which was the main attraction. Any that hae been used as intended will be starting to get worn and/or fatigued by now. Plus axle materials have gone ahead in leaps and bounds since they were made.The simplest diff' lock of all is made by McNamara. A lengthened half-shaft can be slid in or out by a distance of a couple of inches by means of a spring and bolt on the modified wheel hub (right). The half-shafts are splined to the diff' side-gears, and also to the hub driving plates on fully-floating hubs as used on most serious 4WDs. When the lengthened half-shaft is moved inwards, it protrudes through the side-gear and engages with splines in a modified `spider' that carries the four planet-gears within the diff' centre. This locks the half-shaft to the centre and hence locks the diff'. It is necessary to stop and operate this diff' lock with a spanner, and it can only be fitted to the rear axle of a vehicle with fully-floating axles, but it is very simple which is no bad thing.
Personally, I would go for an (in cab) manual or auto locker instead.
I have one in a Rover housing rather than Sals. It is a Macnamara.
They are pretty rare. They would have been very expensive when new. Cross axle diff locks were virtually unheard of in old magazines from the 60s, 70s even the 80s and 90s they weren't common.
Sought after? Well I covet mine-but I like obscure.
Useful? Only if you intend doing some crazy off road driving and have the tyres etc to suit, and even then only if you are a nostalgic fool-there are much more user friendly options on the market now-Detroits, Maxidrives, ARB Airlockers, TJM Prolockers...none of which require climbing out with a big shifter or spanner, which you did remember to bring didn't you...and barring the Detroit all are selectrable, and the Detroit unlocks for cornering.
They don't fit coil sprung housings as the special axles aren't long enough either so the market is quite limited to the Serious Series folks.
That looks like the one.
I have not yet assessed what the condition of the diff is like, hopefully picking the vehicle up this afternoon. Chassis is a bit too far gone in the rear crossmember and round the front but should yeild some good parts including the diff.
Dfendr said you wind it in to unlock it, Ben's quote says you wind it in to lock it. Which is it or do I have to go outside and test for myself?
Pretty sure you wind it in to unlock it. Screwing the bolt clockwise will pull the shaft out of the spider leaving it only engaged on the side gear.(unlocked) Screwing anticlockwise allows the spring to push the shaft into the spider. (Locked)
Cheers, Mick.
1968 SIIa SWB
1978 SIII Game SWB
2002 130 Crew Cab HCPU
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