View Poll Results: Is our Defender worth repairing?

Voters
42. You may not vote on this poll
  • Car is old and buggered - time to buy a new one.

    0 0%
  • Problems are minor and worth repairing. Give the old bus a chance!

    33 78.57%
  • Too hard to advise without looking at vehicle. Need workshop assessment.

    9 21.43%
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Results 41 to 46 of 46

Thread: Urgent mechanical advice required!

  1. #41
    Join Date
    Jan 1970
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    under a rock, next to a tree, at Broadmarsh
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    Any info?

    Quote Originally Posted by isuzurover View Post
    IME the problem is more due to polymerised oil than soot.

    We have been doing experiments with oil aging at the moment. If you place oil in an oven at ~100oC or slightly higher, and bubble air through it, it will start to turn brown and become more viscous.

    The extreme case - as JC mentioned recently, is where you have to stick a screwdriver in the sump drain hole, or light a fire under the sump, so that the oil will drain!
    Hi Isuzurover

    Is there any light reading available about that subject?

    Cheers Arthur

  2. #42
    Join Date
    Aug 2011
    Location
    Currently travelling with no fixed address. Previously, Cairns.
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    A further update - and all is well!

    We've travelled 800km+ from Halls Creek, to Quondong Point near Broome (via Tunnell Creek and Windjana Gorge off the Gibb River Road). The old Defender performed beatifully - no more smoke! I checked the sponge tied over the engine breather reasonably regularly and no dramas; and no drop in oil levels! Even felt happy enough to get her onto the soft stuff into Quondong Point!

    We'll camp here a few nights and then head into Broome to pick up the new filter (thanks Dave & Collin) and we'll be right as rain! In retrospect, we could have done the Tanami, but given the dramas we had, discretion was probably the better part of valour!

    We'll head south to Perth - probably call into Karajini and Ningaloo (we've done both before).

    Any folk in WA know of some good spots on the way south? Anyone know much about Ruddell River Nat Park? Is it worth the trip in?

    Thanks again to everyone for assistance over the past few days - it did a lot to ease my mind and I've learned some stuff along the way!

  3. #43
    Join Date
    Aug 2011
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    Currently travelling with no fixed address. Previously, Cairns.
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    Quote Originally Posted by wrinklearthur View Post
    Hi vnx205

    A history of short running and the fact that, all motors breath to some extent or other, residue is deposited and condenses where the motor is coolest, for example; under the rocker cover and in the 300TDi, also inside the oil separator / breather.

    After a time without it being cleaned out ,that residue can become a near solid grey-black crud.

    Oil changes to get rid of combustion by produces, done on a regular, but short time base, helps keep those places in the motor, clear of build up.

    In the case of any diesel, combustion by produces contain carbon particles and if oil changes are left for an extended times, this carbon finds its way onto the cylinder walls and causes a polishing effect called glazing.

    Glazing is a common problem with diesel Farm Tractors, that are used for long periods doing light duties, such as the feeding out. When used for heavy ploughing the oil consumption is high until that motor settles down again with wear, this can take up to a week of heavy work before the oil consumption drops back to a reasonable level.

    Cheers Arthur
    Would this be the same for a Defender that's mainly done lots of town driving for a few years, and is then doing lots of extended travel, big distances and off road driving (e.g. as part of a long road trip)?

  4. #44
    Join Date
    Aug 2011
    Location
    Currently travelling with no fixed address. Previously, Cairns.
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    Smile Sorted!

    Picked up the new engine breather filter which was waiting for us at the PO in Broome, and fitted it to the car today, no problems. Hopefully we'll have no more dramas this trip!
    Mark.

  5. #45
    Join Date
    Jan 1970
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    under a rock, next to a tree, at Broadmarsh
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    late reply

    Quote Originally Posted by markandsandy View Post
    Would this be the same for a Defender that's mainly done lots of town driving for a few years, and is then doing lots of extended travel, big distances and off road driving (e.g. as part of a long road trip)?
    Hi Mark and Sandy

    To glaze the bore in a Defender, you would have to idle it all the time and not load up the motor at all and that's not going to happen in town, as you are constantly speeding up and then slowing down with the traffic.

    Enjoy the rest of your trip now.

    Cheers Arthur

  6. #46
    Join Date
    Aug 2006
    Location
    WA
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    Quote Originally Posted by wrinklearthur View Post
    Hi Isuzurover

    Is there any light reading available about that subject?

    Cheers Arthur
    This site has a good general overview.
    Oil Degradation

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