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Thread: Td5 went bang, diagnosis thoughts?

  1. #1
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    Td5 went bang, diagnosis thoughts?

    Interested in peoples thoughts on what went bang in my Td5 today.

    Background: Td5 Auto Disco. ECU upgrade, uprated intercooler, Boost box, EGR delete, 280,000km. Mobil 1 Oil change every 10,000km.


    Driving up a hill, maybe 7km from home, on the highway. Foot to the floor in 3rd at 100kmh.

    Power was a little off, enough for me to notice it but not to over think it.

    Half way up the hill the motor goes bang, power reduced, it sounded like a cylinder clicking, smoke was coming out from the back.

    Engine still has power, but not full power, I turned into the side street at the top of the hill and parked it to be towed.

    Engine smoke was coming from the front also, and there is blowby smoke from the oil fill hole when I opened the cap. Oil is half way up the dipstick but the dipstick wasnt cleaned prior to checking, the coolant bottle is still full, no fluids were dropped


    When I got home tonight. Disco starts without problem, there are no weird noises, I drove it without problem into the shed, there was a fair bit of exhaust smoke.


    Open the bonnet. Air filter is a bit dirty but ok. Pulled the filter box out.

    Pulled out the turbo to intercooler hose set, no delaminated turbo hoses.

    There is however a fair bit of black oil inside the hoses, which I can only assume is engine oil.... so if there is engine oil in the intercooler hose, it did make me wonder how much is left in the engine???

    I checked the engine oil, and the oil level is half way up the dipstick!!!

    It was about then that I turned off the shed lights and walked away...... thinking this is going to be expensive!


    I'd be interested to hear the thoughts of the good minds on here as to what happened?

    At first I thought it spat a piston
    Then I wondered if was an intercooler hose
    Then I wondered if the head cracked in a big way
    Currently I wonder if it has leaked diesel into the oil and oil dilution has popped the turbo.
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  2. #2
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    Ouch!
    Your last suggestion seems to fit the events. How many kms since the oil level was last checked?
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

  3. #3
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    Fingers crossed only a turbo?

    You won't really know until you pop the turbo off, which is the easiest place to start before doing a leak down or compression test.


    What do the boys on the FB HMLR page suggest?

  4. #4
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    its leaked diesel into the engine oil.

    drain it and replace it but while its draining, bridge the fuel pump relay with the rocker cover off so you can see where its coming from.

    once youve got a line on where its coming from we can work out how to fix it.

    in the mean time gently roll the engine over by hand to see if its got any unusual stiff points.

    if you are very lucky, the excess smoke and blow by is being created by the crank case not being able to vent correctly due to fluid blocking an internal port on the engine.

    if you are even luckier the bang you heard was the crank case vent regulator thing letting go and not something more expensive.
    Dave

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  5. #5
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    Quote Originally Posted by Graeme View Post
    Ouch!
    Your last suggestion seems to fit the events. How many kms since the oil level was last checked?
    Thanks Graeme, I'm not definate but it probably wouldn't have been more than a couple of thousand km's ago.

    Interestingly, the fuel consumption last time I filled though was about 18l/100km which I was a bit surprised by.
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  6. #6
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    Quote Originally Posted by rick130 View Post
    Fingers crossed only a turbo?

    You won't really know until you pop the turbo off, which is the easiest place to start before doing a leak down or compression test.


    What do the boys on the FB HMLR page suggest?
    Thanks Rick, I think you're right, I'll have to do more pulling down.

    Good question about HMLR, I didn't ask on there thinking it wasnt such a hard core question.
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  7. #7
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    Quote Originally Posted by Blknight.aus View Post
    its leaked diesel into the engine oil.

    drain it and replace it but while its draining, bridge the fuel pump relay with the rocker cover off so you can see where its coming from.

    once youve got a line on where its coming from we can work out how to fix it.

    in the mean time gently roll the engine over by hand to see if its got any unusual stiff points.

    if you are very lucky, the excess smoke and blow by is being created by the crank case not being able to vent correctly due to fluid blocking an internal port on the engine.

    if you are even luckier the bang you heard was the crank case vent regulator thing letting go and not something more expensive.
    Thanks Dave, really good points there, especially with lifting the cover and seeing if the the leak is visible to sort, but I hope its sortable. I hadn't considered it coming through the crank case ventilation, a far better option than via the turbo! Hopefully if I just flick the ignition to on it will fire up the fuel pump? Fingers crossed here!
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  8. #8
    discorevy is offline ChatterBox Silver Subscriber
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    colour of exhaust smoke?
    Assuming you have a boost gauge ...Reading ? , ditto egt's
    did you check the cold side intercooler hose?, intercooler as well?
    Yep , you can turn ign on to check leaks from injector O rings , or floor the accelerator 5 times for purge sequence if you need to look for longer, but recheck oil level after it has been sitting for a few minutes first

  9. #9
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    I'd be having a quick check of the turbo shaft using fingers via the air intake to check if it still spins and floats normally.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

  10. #10
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    Quote Originally Posted by Slunnie View Post
    Interestingly, the fuel consumption last time I filled though was about 18l/100km which I was a bit surprised by.
    So it would appear that the full sump is a recent condition and therefore very likely to be associated with the event rather than unrelated.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

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