Strange Suzuki Limited Slip Diff

  1. merryman Member

    Messages:
    413
    Location:
    Lancaster, England
    I have been having big problems with a limited slip front diff on a Suzuki Quad at work. The owner had let the bearings get so bad that the input shaft had come out of the diff and flailed round on the propshaft, smashing lumps out of the casting where the oil seal should go. As Suzuki parts are eye wateringly expensive we got new bearings & seals and a new half diff casting. The limited slip part isn’t shown in the official manual as a serviceable item so I left it alone. Of course when I tried the bike out, the diff was locked solid. So back to bits again, and I split the part usually housing the “spider.” This one contained neither spider nor gears. It is the weirdest diff I have seen.
    KQ diff1.jpg KQ Diff2.jpg

    The half shafts fit into the strange face cams shown in the photo. One has a thrust and a Belville washer behind it, and a set of individual teeth slide up and down in splines cut into the crown wheel carrier, they mostly fell out when I split it and the whole thing was full of black gritty slime. After cleaning I tried re-assembling as shown in the photo, left tooth, right tooth, left tooth, etc, which looks logical. Diff just locked solid again. When I originally took it apart it didn’t seem to be like that, so tried two lefts two rights, two lefts, etc. This looks totally wrong but it does now work, what’s more when you turn one wheel forwards by hand, the other wheel revolves the opposite way like in a normal diff. How does that work? Anyone seen this style LSD before?
     
  2. armalites Member

    Messages:
    3,661
    Herefordshire
    Does it have switchable 2wd/4wd?

    I'm wondering if it's not a LSD as in locking the wheels together but more a way of limiting drag when not in 4wd. So when there is drive to it the teeth spin out and lock it.
     
  3. merryman Member

    Messages:
    413
    Location:
    Lancaster, England
    Well it feels just like the clutch plate LSDs used on Hondas. It does have a dog clutch in the diff housing for 2WD/4WD, but the idea is to allow the wheels to turn at different speeds, but feed power to both in the event of one wheel losing traction, like any other off road vehicle without a switchable front wheel diff lock.
     
  4. 8ob

    8ob Member

    Messages:
    3,695
    Location:
    moscow on thames
    Very similar to one I had in a mk1 escort with a silly engine, It had no plates or planetary`s in the diff, the speed differential and loading between the two halfshafts if driven in anger would force pegs into the housing to lock the diff. Crude but effective .you needed your wits about you if driving like a twat.

    Bob
     
  5. ibrooks Member

    Messages:
    974
    UK Lancashire
    Looks to me more like an auto locker than an LSD - when the conditions for operation are met it just locks. It probably works on inertia throwing the dogs outwards when one wheel is spinning quite a bit faster than the other.

    A while back I heard that some guys using cheap old Jags as track day toys had found that the rear diff was pretty similar to the Salisbury one on the back end of a Stage 1 V8 Land Rover and that Detroit auto locking diffs were a lot cheaper than LSDs. They couldn't work out why it kept spitting them backwards out of corners until someone explained the difference (probably using short words).
     
    Wallace and Hopefuldave like this.
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