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Thread: Ease of removing & fitting 300 TDI starter motor

  1. #1
    Join Date
    Mar 2010
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    Ease of removing & fitting 300 TDI starter motor

    Hello All,

    How involved is it to remove the starter motor on a 300tdi in a Series 1 Discovery? When I had a Jeep Commander to remove the starter motor it needed the passenger front wheel to be taken off. The engine and gearbox mounts needed to be undone and the engine and gearbox to be jacked up to be able to just access the starter motor. I checked the access to the starter motor and decided that I would pay money to torture the auto electrician, instead of doing the job myself. Given this experience, I wonder if the Disco's starter motor is easier to access than the Jeep's starter motor?


    I went to use my Discovery 1 last weekend so I could tow some stuff around the paddock and let it earn its living only to find it would not start. With a full charged battery there was only a very slow and very tired sounding 'whir' coming from the starter motor. No where near enough movement to spin the diesel motor over at all. Since I bought the car only for the 300 tdi it came with a hit and miss starter motor. It would act as if the battery held really low charge and was about to go totally flat. Then when I was about to give up hope - the starter would spring to life and the engine would roar into life. On the weekend the hit and miss starter motor only missed. Just to eliminate the chance that the battery trickle charger had given an incorrect reading I connected a set of jumper-cables from Snowy - my Defender ute, while the engine was running. The starter motor kept is slow drag and failed to get the engine started. I would like to regularly start and run the 300tdi as I bought the engine for when Snowy's 200tdi might need replacing. Not being able to start the Disco so I can use it in the paddock and keep the motor turning over is not in keeping with my plans. I reckon the starter motor needs replacing. Is this a complex job access wise like the Jeep or is it more accessible?

    Kind regards
    Lionel

  2. #2
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    Disco Starter Button

    Hello All,

    The Discovery is the only one I have driven, so my experience is very specific only to one vehicle - so bear with me, please. When I first tried to start the car by turning the key ignition it did not result in the starter motor starting. After some trial and error of flicking different switches and pressing buttons I found a big rubber bulb-shaped button located on the dash to the left of the steering wheel. When I pressed the button the starter motor worked and started the engine. Is this press button start button a standard feature like the Series 1 had? Or did the previous owner have issues with the starter motor circuit and rigged something up by installing the starter button on the dash?

    I will take a photograph of the starter button tomorrow after the sun comes up.

    Kind regards
    Lionel

  3. #3
    Join Date
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    Check ur cables too. ie. both pos and neg for connection issues, or degraded lines(dreaded copper green).

    Could just be a bad earth at the block or something.

    Starter is on the exhaust side, IIRC the exhaust makes it a tad tight in there to swing some tool types, but I don't recall that it's not a hard job to do.

    I didn't actually end up removing mine, just got under there to start replacement, and found my earth cable a wee bit loose .. doh!

    6 years later, I still have the starter I bought for it ... and only reason starter hasn't failed, is because I held onto the new starter for so long
    Arthur.

    All these discos are giving me a heart attack!

    '99 D1 300Tdi Auto ( now sold :( )
    '03 D2 Td5 Auto
    '03 D2a Td5 Auto

  4. #4
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    And no bulb like starter button.
    I'd say ignition switch has retired from it's electrical duties and previous owner went with the cheaper option of a start button instead of a new ign switch.

    Another thing I thought of after my first reply ... do you wait for the preheat/glowplug light to go out before starting?
    Tdi has a timed glow plug system. I think about 10sec or so(maybe more) ... but mine has always needed the glow plugs to do their work before firing up quickly.

    So, if I immediately start, battery sounds sluggish, and tdi needs more cranking time to fire up.
    If I use IGN on - wait 10sec - then hit starter, cranking is much faster and fire up is less than a second.

    I'm thinking that she don't enjoy having both the starter AND glow plugs consuming all those amps at the same time.
    Arthur.

    All these discos are giving me a heart attack!

    '99 D1 300Tdi Auto ( now sold :( )
    '03 D2 Td5 Auto
    '03 D2a Td5 Auto

  5. #5
    Join Date
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    While since of done it but I don't remember it being at all fiddly unlike a Td5

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