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Thread: Ca thunk ca thunk. HELP!!!!

  1. #1
    Join Date
    Mar 2013
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    Ca thunk ca thunk. HELP!!!!

    Hi all,
    Hope you are having a great weekend.
    Got a problem, need some help, done a search, cant find an answer.
    Heres how it went.
    Drove to Melbourne from Bright (Alpine region). Had a good run, parked in a carpark, got back to the car, went to reverse but she would not move. I could inch forward but was parked in by a car. Gave it a few revs to get moving in reverse and was rewarded with a rythmic shudder shudder (also could be described as ca thunk ca thunk. This was in forward and reverse. Seemed to be coming from rear passenger wheel. Nothing obvious from outside, but in the car was loud and it was able to be felt through the whole car. Took it to a mechanic who said the auto trans fluid was a bit high ( I thought so too ). Park brake seemed to be working ok. Tried to put it on slowly while driving slow and was working gradually and not grabbing violently. The other symptom is it feels like something is grabbing quite violently and letting go. This feeling decreases with speed. Symptom has disappeared for now, but have to drive back to Bright tomorrow with the lovely wife. Rear diff fluid is a a good level and good colour.
    Any help would be appreciated.

    Regards
    John

  2. #2
    Join Date
    Apr 2009
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    Crafers West South Australia
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    Sounds like you have broken a rear axle and the viscous centre diff is allowing relaitive movement of the broken bits under heavy load. The viscous will allow modest load without slippage so you should be able to drive it with a light right foot. You would kill the viscous if you put too much power through it while its slipping. A good viscous centre coupling takes a reasonable amount of force before it slips.

  3. #3
    Join Date
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    What did the Mechanic do? Lift the rear and check the Diff / rear axles / Prop shaft etc.

  4. #4
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    Thanks bee utey

    Thanks mate.
    I'll nurse it home and have a look.
    Kind regards
    John

  5. #5
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    Hi Wayne
    Just took my young one to a dance. No probs so far. Seems to have been visited by the fairies. Dont want to take that chance though. Have you got time for a chat? Text me your phone number to 0419 485152 and I can call you back.
    If thats not cool I totally understand.
    Kind regards
    John

  6. #6
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    What the Mech did

    He tried to get a fault, but her majesty didnt want a bar of it, his reader was not up to the job. So he checked the auto fluid level, and said it was high ( it was). He thought this might mean not all the fluid was getting where it should and so not giving full hydraulic pressure to the rear of the box (my words not his), thus causing the stutter. He thought the VC was not getting enough fluid to work properly.
    He had a look at the drive shaft and uni's. I had a look also and it all looks and feels solid. I took the rear passenger wheel off and as I lifted it clear of the ground it kind of twitched around a fraction of a turn. I've never seen that before, it looked like it was under some kind of pressure. The hand brake was off and it was in neutral. It was not spinning free either, not sure if it should.
    Also it really felt like the brakes were grabbing and letting go in a definate rhythm, and disappearing as my speed approached about 60.
    So if that gives any food for thought I would appreciate your thoughts.

    Cheers

  7. #7
    Join Date
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    Could it be a wheel speed sensor failure? Any ABS or TC lights on the dash?

    Also, the VC is in no way effected by the transmission oil level. It is an independent unit.

  8. #8
    Join Date
    Mar 2008
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    You cant 100% check the axle shafts or diff without a bit of surgery.
    It is easy enough to slide the axle shafts / Hubs (as a complete unit, unlike the instruction in Rave) out enough to remove the diff and inspect both. Should take about 2 hours out and back in.
    If you lift the rear of the car, with both sides up if you turn one hub the opposite should turn in the opposite direction if all is connected. If one side moves freely one of the axle shaft might be broken or the diff failed.
    I am no expert but thats were I would start.
    From what you are saying with the wheel jerking when it was lifted from the ground that is a sign of wind up in the transmission line and would point at the viscous coupling seized up. To test the viscous lift one front wheel and you should be able to turn it very slowly with a fair bit of force. If the wheel does not move try a long lever on the front prop-shaft with both front wheels up. You are more likely to damage a front CV joint with a seized Viscous. Try driving in a tight circle to really put some strain on the system and expose any weakness.

  9. #9
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    Keithy and Wayneg

    No lights on the dash. No warnings.
    Have not lifted the rear and front ends yet but will ado so asap.
    Good news though. Drove around town a bit more with no probs, (as it happened did a couple of nice tight U-turns) with no more symptoms at all.
    No nasty noises or thumps. Drove home to Bright with no hassles either.
    One thing did grab my attention at the mechanics. I noticed the ABS pump cycling a lot ( am ordering new accumulator plus Russels kit tomorrow ), plus it was super hot. I have been running the brake fluid a little on the low side to stop it overflowing when switching off the motor. I topped up the fluid today and the pump is running a lot less hot. I wonder whether I may have inadvertantly heated the brake fluid and expanded to such a point that it swelled in the lines?
    Anyhow I will have a go at all your suggestions as time permits. No long trips in the near future anyway. I will also keep you in the loop as to any firm causes and remedies.
    I will be giving her majesty to the stealers for a complete error check and check over, as I have only had the car a short time, so I will let them do their best also.

    Thanks heaps for the input and interest guys, it is much appreciated, and all the best for now.

  10. #10
    Join Date
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    I will be giving her majesty to the stealers for a complete error check and check over, as I have only had the car a short time


    Be warned the dealers will fleece you, Find yourself a good independent Land Rover specialist or you will be subject to a potential massive bill as the dealers change random bits at your expense. I am sure someone can advise on a good Indy close to you.

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