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A mechanism called the differential allows rotating parts to turn at different speeds to each other.
Jimnys have two differentials,one in each axle, this allows the inside wheels to rotate at a different speed to the outside wheels,necessary for going around corners in 2 wheel drive.
Permanent 4 Wheel Drive cars (NOT JIMNYS!) have third differential mounted in the transmission, this allows the front axle to rotate at a different speed to the rear axle, necessary for going around corners in 4 wheel drive.
As the Jimny does not have this differential then the front and rear axles are locked together in 4 wheel drive and therefore cannot go around corners unless there is some slip in the system (i.e. a loose or slippery surface) to allow rotational tension in the system to be dissipated. Driving on a surface where this tension cannot be release results in something expensive having to break to release the tension.
Martin
2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
mlines wrote: A mechanism called the differential allows rotating parts to turn at different speeds to each other.
Jimnys have two differentials,one in each axle, this allows the inside wheels to rotate at a different speed to the outside wheels,necessary for going around corners in 2 wheel drive.
Permanent 4 Wheel Drive cars (NOT JIMNYS!) have third differential mounted in the transmission, this allows the front axle to rotate at a different speed to the rear axle, necessary for going around corners in 4 wheel drive.
As the Jimny does not have this differential then the front and rear axles are locked together in 4 wheel drive and therefore cannot go around corners unless there is some slip in the system (i.e. a loose or slippery surface) to allow rotational tension in the system to be dissipated. Driving on a surface where this tension cannot be release results in something expensive having to break to release the tension.
It's a hard concept to visualise - we push prams around all day and such like and get used to the scrubbing - and I have never found a good way to explain it to the likes of SWOM but isn't it about simply straight line driving forgetting corners for the moment. The fronts (wheels, axle whatever) are not rotating at the same revs as the back and even if they were meant to the tyre wear and other factors would still have an effect. So running at two different speeds causes the catch up effect.
This is what we believe has happened to my dads defender, we think difflock engaged itself on the a14 going 60 transmission swiftly wound up and something went bang. Yet to fully diagnose the fault but we suspect centre diff or t box.
jonesyba420 wrote: This is what we believe has happened to my dads defender, we think difflock engaged itself on the a14 going 60 transmission swiftly wound up and something went bang. Yet to fully diagnose the fault but we suspect centre diff or t box.
Blimey it must be a poor design if it can engage willy nilly.
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