Colt 2.8 tdi clubcab engine rattle





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  1. #1
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    Default Colt 2.8 tdi clubcab engine rattle

    Hi guys im new to the forum and need some advice with my colt

    my bakkie has a funny scratchy rattle at different times almost like metal on metal it is more noticible when cold i let the bakkie idle and warm up for about 5 minutes before driving off. Thing is it makes this terrible noise at from about 2000rpm to about 3000 rpm. Note it is the same noise throughout those rpm's the rattle doesnt get louder it stays the same, the bakkie idles normaly there is no grrr grrr grrr sound at all so i dont think its the timing chain.

    When the bakkie is warm it sometimes makes the same rattle as described above, but alot softer when the bakkie is warmed up and on operating temprature.Also it is intermittent and not all the time. My thinking is that its maybe something to do with an injector somehow

    I took it in this morning to a diesel specialist workshop. Specialising in diesel pumps and injectors. When he had a look at the bakkie there was no funny rattle at all. We also took it for a test drive to indicate to him the rattle noise that it sometimes makes. But murphy's law it made no funny racket at that specific time.
    He reckons to bring the bakkie on wednesday so that they can pull injectors and have a look at them etc etc. but before i do that i would like some advice

    if anyone can give me some advice or point me in the right direction it would be much appreciated

    thankyou advice would be much appreciated thanks

  2. #2
    Join Date
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    Default Re: Colt 2.8 tdi clubcab engine rattle

    The 4M40 is an Indirect Injection engine. This means there is a Pre-Combustion Chamber inserted into the cylinder head.

    The injector sprays into the Pre-Combustion Chamber, and the compression then ignites the diesel. This is standard for a lot of the old school mechanical injection diesel engines.

    The chambers are press-fit into the head during the manufacturing process, to very close tolerances, using a combination of extreme heat and extreme cold.

    Eventually, due to the detonation and combustion forces, they become loose, and have been know to crack the head and even drop onto the pistons.

    I would suggest that your "mechanic" puts an endoscope into the injector and glow plug holes and should look at each chamber for cracks and gaps.

    In the image below, the pre-com chambers are the things sitting above the valve recesses at around 1 o'clock on the top image.

    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

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  4. #3
    Join Date
    Jun 2012
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    Default Re: Colt 2.8 tdi clubcab engine rattle

    Does it only occur when the bakkie is moving or when stationary as well?
    Brent

  5. #4
    Join Date
    Feb 2016
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    Default Re: Colt 2.8 tdi clubcab engine rattle

    Mine did the same.

    Turns out the timing chain was worn and the pistons were hitting the valves at certain RPM. Or thats what the mechanic said.

    But Jelo seems to know a lot about these engines, so you'd better listen to his advice.

  6. #5
    Join Date
    Mar 2008
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    Default Re: Colt 2.8 tdi clubcab engine rattle

    Too many possibilities on an old donk.
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

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