Torque Cars

What could cause a massive thud when switching off the engine ?

Discussion in 'Diesel Chat' started by FastLife91, 17 March 2019.

  1. FastLife91

    FastLife91 Torque Junkie

    Messages:
    121
    From:
    England
    Car:
    Ford Focus mk2
    Please help, this is so depressing and I am hating the moment when I turn the engine off because of it happening.

    A ' mechanic friend' at the time poked a pry bar through drivers side wheel area to try find cause of a different issue.
    I turned engine off after he did that to walk into the garden with him and it happened for the first time.
    Immediately from that instant onward whenever I switch off the engine I can feel a massive thud.
    however sometimes goes okay and switching the engine off will be back to normal completely smooth and can't feel a thing, then a few days or sometimes weeks later it comes back, a massive thud.
    It caused the pulley on the alternator to rattle eventually it smoked and burnt out the pulley and the alternator had to be replaced and I am scared it will damage more parts.
    I have had a few garages look at it and they can't find anything but annoyingly the thud isn't half as bad when it's in the garage or disappears completely and will all the background noise and vibrating from the roads it doesn't seem as bad.

    More often than not the thud seems stronger the longer the engine has been running, but sometimes I can be driving hours on end and the thud will be only just noticeable.

    Please Please can anyone read this and help tell me what it could be ? thanks.


    edit : It happened the exact instant he poked pry bar through drivers wheel area so I am sure it must be related
     
  2. Lunchmoney

    Lunchmoney The Torque Meister

    Messages:
    1,135
    From:
    Poole, UK
    Car:
    '98 JDM Impreza STI
    Any chance you can take a video?
     
  3. FastLife91

    FastLife91 Torque Junkie

    Messages:
    121
    From:
    England
    Car:
    Ford Focus mk2
    Hey Lunchmoney

    I have tried to video it but as it is more felt then heard the video didn't really reveal anything at all, though sometimes you can hear the thud as well as hear it so will try again, it depends on how well the camera picks it up.
    Meanwhile do you have any ideas to the cause ?

    Thanks very much
     
  4. Lunchmoney

    Lunchmoney The Torque Meister

    Messages:
    1,135
    From:
    Poole, UK
    Car:
    '98 JDM Impreza STI
    Sorry, not an idea at all right now. Thought a video might help others diagnose.
     
  5. Lunchmoney

    Lunchmoney The Torque Meister

    Messages:
    1,135
    From:
    Poole, UK
    Car:
    '98 JDM Impreza STI
    Does the car jerk forward when you turn it off? Like if you left it gear?
     
  6. FastLife91

    FastLife91 Torque Junkie

    Messages:
    121
    From:
    England
    Car:
    Ford Focus mk2
    Hi, no it doesnt jerk forward or anything like that when I turn off the engine. Also it still does it whether or not I press the clutch pedal in at switch off
     
  7. TCJBOLDIE

    TCJBOLDIE Torque King

    Messages:
    4,807
    From:
    Brisbane
    Car:
    JB Starion
    When your "mechanic" poked the bar in was the motor running and what is on that side that he may have damaged with his poking?
    Does it still klunk if it is in neutral?
     
  8. FastLife91

    FastLife91 Torque Junkie

    Messages:
    121
    From:
    England
    Car:
    Ford Focus mk2
    Hi
    I am not totally sure whether or not the engine was running at the time he poked the bar through.
    It doesnt do it at idleor in neutral, only once tbe engine is switched off you can hear the thud and when it is there it is a very strong thud, hence it eventually ruined the alternator, the pulley on it.
    It seems the longer the car had been run the stronger the thud is, though sometimes I can drive for hours and can not feel it at all.

    Thanks
     
  9. TCJBOLDIE

    TCJBOLDIE Torque King

    Messages:
    4,807
    From:
    Brisbane
    Car:
    JB Starion
    Long ago back in my youth I had a strange sound that I could not find the cause so drove it to a workshop while it was making the noise turned the car off and when the mechanic came and started the car it had disappeared..V(

    I eventually tracked it down to a broken alternator bracket, the one with the long slot.It was not obvious as it still appeared to be straight and perfectly in line/straight.
     
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