Reply With QuoteAccording to the first post, the vehicle in question is an '85 120 - this would have oil lubricated splines from the start unless the rear axle has been replaced at some time.Originally Posted by Bush65
John
YarnMaster
The salisbury is 24 spline, but front diffs may be 10 spline. So if fitting a front locker you are better off getting a 24 spline version and upgrading the half shafts....
A bit off topic but I've always been confused about why the need to upgrade shafts / CVs when fitting a locker (presuming it's not about spline matching). I would have thought that a locker would give them an easier time since it presumably reduces the wheelspin / sudden traction shocks as the wheels on a single axle are locked together and permanently driven. It also effectively limits the maximum amount of power going through a single wheel to 25% (as opposed to 50% with an open cross-axle diff). Or am I completely confused here
With open diffs the maximum torque transmitted through the half shaft is limited by the traction at the wheel that has the least traction. This may be none at all if the any wheel is in the air and the centre diff is open.
With the centre diff lock and a cross axle diff lock both engaged, the torque in the half shaft for the wheel with maximum traction can be up to the limit of traction at that tyre (or less if the engine torque multiplied by the reduction gear ratio is less).
Also if you have a wheel in the air which is spinning when it lands, there is a considerable shock load in the half shaft, etc. and is more of a problem with a locked diff.
As you have found, the splines wear at the drive flange. This has been a known issue for many years and is worse with grease lubricated wheel bearings. To improve this, Maxi-Drive Engineering made rear half shafts and flanges with longer splines, increased area of engagement = reduced pressure = reduced wear. So that is another reason to upgrade the half shafts and flanges.
It is also good reason to convert the wheel bearings to oil lubrication (something Land Rover used to have in the past).
Not only is spline wear reduced but wheel bearing life is also improved. When Land Rover converted to grease lubrication, they changed the seal in the hub to a grease seal. This grease seal is not as effective at keeping water, mud and dust out of the wheel bearings.
If you stick with grease lubrication then you maintenance increases. The wheel bearings and axle splines need regular inspection (for wear and contamination), cleaning and re-greasing. Dust that enters the lip of the grease seal causes the wear of the seal surface on the stub axle and the lip of the seal itself.
RoverLord
According to the first post, the vehicle in question is an '85 120 - this would have oil lubricated splines from the start unless the rear axle has been replaced at some time.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
YarnMaster
SubscriberThe way I see it is that if you buy lockers for front and rear, you suddenly have a 'true' four wheel drive with all diffs locked.... So, with this in mind, lets say you have driven into a bog...., and have three wheels in the wet stuff and one of the rears on bitumen.... With open diffs (std) and the center diff locked, one back wheel will spin (the one in the mud), and so will one or both of the fronts... You will need more power or a tow to get out of said bog hole.... Ten min later and you are out with a dirty truck or the assistance of a mate. No harm done.. Now to the additional axle lockers... Lock both axle diffs and suddenly you are able to put ALL the engine power/torque through that one poor little original shaft that happens to be the unlucky one sat on bitumen. As you have traction, most will plant their right foot to the floor and either light the tyre up on the bitumen up or.. 'Bang' and break the original shaft... (Note, marzipan was a key ingredient in the manufacture of these original shafts!!!). Hope that explains the need to upgrade shafts when fitting lockers.... (Not only that, if you hadn't fitted the lockers, you probably wouldn't have attempted that bog hole in the first place!!!!
)
TopicToaster
SubscriberYes, Detroit is an easy bolt in fit with standard axles. I've got that setup in mine and so far haven't broken a standard Salisbury axle.Jim, truthfully I can't justify spending money on a locker in the foreseeable future; I really only entertained the thought if I was going to have to pay to have the diff rebuilt anyway. If I eventually do put in a locker, I'd probably go for a detroit which I think are compatible with the standard 24 spline shafts?
A bit off topic but I've always been confused about why the need to upgrade shafts / CVs when fitting a locker (presuming it's not about spline matching). I would have thought that a locker would give them an easier time since it presumably reduces the wheelspin / sudden traction shocks as the wheels on a single axle are locked together and permanently driven. It also effectively limits the maximum amount of power going through a single wheel to 25% (as opposed to 50% with an open cross-axle diff). Or am I completely confused here
I'd only consider it with a Salisbury axle though - not a Rover one. I've got a locker and upgraded axles in the front diff.
Steve
1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
1988 120 with rust and potential
1999 300tdi 130 single cab - "stock as bro"
2003 D2a Td5 - the boss's daily drive
YarnMaster
SubscriberI believe the major area of concern in not the actual axle shaft breaking, but I've been told that when it does it'll take the Detroit Locker with it due to the shock as it lets go.....
TopicToaster
SubscriberI'm only aware of 2 documented instances of that happening, and neither were in a LR Salisbury. The legend continues though. I'll definitely document it if mine grenades.
Steve
1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
1988 120 with rust and potential
1999 300tdi 130 single cab - "stock as bro"
2003 D2a Td5 - the boss's daily drive
Posting Permissions
| Search AULRO.com ONLY! |
Search All the Web! |
|---|
|
|
|
Bookmarks