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Thread: 454 Forfour CDi head gasket failure

  1. #1
    Join Date
    Feb 2014
    Location
    Wicklow, Ireland
    Posts
    2

    454 Forfour CDi head gasket failure

    May I introduce myself?
    I'm Tony from the East coast of Ireland. My other half runs a 2005 LHD ForFour CDi 95 we brought in from Germany some months back (replacing a leggy but loved Forester Turbo). It has 180k kms and is in generally good nick.

    Perhaps people on here have some advice...
    We've discovered the 454 is using a small amount of coolant and seems to have a little oil in the expansion tank. Use is around a litre of water/1000 km. We've been nursing it like this for 10k kms or so, pending getting some time to explore the problem. Local garage thought it might be the oil cooler (I assume it uses an oil/coolant type cooler). On closer examination they now think its the head gasket. There is no mayonnaise around the oil filler cap or exhaust smoke/steam. Dipstick seems water-free. The motor runs faultlessly and (barring codes which I have not checked) the oil in the coolant and the water loss are the only symptoms of a problem.

    Any thoughts anyone? The garage is angling to pull the motor and replace the head gasket but have no experience of this car. I have no intention of authorising anything until I have confidence in what is being done and why. Also until I have seen fault codes and sourced a replacement head, head gasket set, and detailed work instructions. All of which will be a challenge in tiny Ireland!

    Cheers

  2. #2
    Join Date
    Nov 2007
    Location
    BANCHORY
    Posts
    3,031
    Do a block test to check for combustion gases in coolant to confirm whether head gasket is gone.
    Drives a Smart Cdi - 65 to 85 MPG

  3. #3
    Join Date
    Feb 2014
    Location
    Wicklow, Ireland
    Posts
    2

    Re: 454 Forfour CDi head gasket failure

    Thanks for that Tolsen.
    I assume this involves flushing the coolant jacket, refilling, adding an indicator substance then running the motor under load for a while....


    T

  4. #4
    Join Date
    Nov 2007
    Location
    BANCHORY
    Posts
    3,031
    Not at all. Just run engine, remove expansion bottle cap and fit block tester whilst drawing gas samples from expansion bottle through block tester test fluid. Test indication fluid in block tester will turn yellow if test is positive. Test is very sensitive.
    Drives a Smart Cdi - 65 to 85 MPG

  5. #5
    Join Date
    Mar 2008
    Location
    BRISTOL
    Posts
    2,686
    Not heard of head gasket issues on any of the forfours and the cdi is the toughest engine of them all.

    Unless it's been run dry then.

    But there is always a first.

    JJ

    www.forfour.co.uk - forfour technical forum
    www.evilution.co.uk
    www.quidco.com << CLICK - cash back on car insurance and online purchases

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