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Thread: DMF - A little tip.

  1. #1
    Regular Member Maverick's Avatar
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    Default DMF - A little tip.

    I was talking to a VX techie that I have known for years, he works at the VX tech centre at Luton.

    To keep the DMF alive for longer, always start the car with your foot on the clutch, like you do on most other cars.

    The apparent reason, which does make sense is this :-

    The starter motor, turns the ring gear on the flywheel, this part of the flywheel is rigid to where it bolts engine side.

    When you start with out the clutch pressed, you are dragging the gearbox round, which is connected to the middle of the flywheel which 'floats' Although the car is in neutral your still turning it.

    With the clutch pressed, the input shaft of the gearbox is free and it allows the flywheel to turn with the 'floating' centre section trying to carry the gearbox as well.

    A worthwhile tip I think!

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    Vehicle : Vauxhall Insignia

    Trim : SRi

    Engine : CDTi 160

    Year : 2009

    Mileage : 53.000

    Default

    I was always told to start the car with my foot on the clutch in any car....apparently puts less strain on the engine/clutch/transmission?

    Good advice though

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    Regular Member Ian S100's Avatar
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    & much less strain on the battery, particularly in winter.

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    Regular Member 67688c's Avatar
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    Default

    A good tip..yes, but one that has been known about for the last century, even before the days of DMF's it's always been good practice to depress the clutch when starting a car, as it reduces the load placed on the starter motor, and hence the battery.

    In fact as you know almost all new later model cars cannot be started anyway unless the clutch is depressed, even if in neutral. (including the Insignia, Astra) It serves 2 purposes, less strain on components, and prevents the car from shooting forwards if in gear.

    I suppose its something that may not occur to everyone, times do change I suppose, when I started driving it was very common for most owners to do all their own servicing, and engine de-cokes, valve regrinds, clutch changes etc, so the average owner then had probably a better understanding of how cars functioned. Cars then of course had distributers, with points, and bob weights to control spark timing, so I suspose they needed to, as obviously cars were not as reliable as they are today.
    Last edited by 67688c; 15th February 2010 at 17:51.

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    Default

    Depressing the clutch on start up is something i have always done for the above obvious reasons...

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    Full Member Niall83's Avatar
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    I've always started with the clutch down, reason i always leave the car ingear, never trust the handbrake

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    Regular Member Maverick's Avatar
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    Default

    I have always started with the clutch pressed out of habit, as you need to do it on our freelander 2.

    But I am sure there are many that don't.

  8. #8
    Regular Member 67688c's Avatar
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    Default

    Quote Originally Posted by Niall83 View Post
    I've always started with the clutch down, reason i always leave the car ingear, never trust the handbrake

    Wise man!







    You would be surprised how many silly people don't however.

  9. #9
    Regular Member mark_647's Avatar
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    Always done out of habit since my Dad and Grandad told me, before I could legally drive. (Used to drive on farms, etc)

    A good habit to get into.

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    Regular Member Fash's Avatar
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    Wel I must be one of the few people who never did that. I will start doing that from tomorrow (if I remember, Lol).
    Great tip

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