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Thread: 300Tdi heads & injections

  1. 30th June 2008, 07:22 AM #1
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    Leo109
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    300Tdi heads & injections

    Hi All,

    I'd like to get a few opinions and tips on 300Tdi maintenance issues.

    Our '97 Dscovery has about 255,000 km on it now and I'm thinking of shouting it a set of new injectors (overall economy has been trending very slowly downwards over the last couple of years). A few years ago I had one injector out (long story) and it was very tight in it's hollow in the head and there was quite a lot of dirt, rust and gunge around the barrel of the injector.

    So, what's the recommended method of removing the injectors without damage (in case they are still quite OK). I've made-up a slide hammer to attach to the top thread so I can knock them out without twisting but is this the best method? And after they're out, what's a good way to clean out the hollows in the head without all the gunge falling into the cylinders?

    Next question is the head gasket. A lot has been said and written about head gasket failures on 300Tdis but do they all fail eventually? - or do we only hear about the minority that do? Is a "pre-emptive strike" called for? That is, at 255K km would it be a good idea to replace the head gasket because it's probably likely to fail sooner or later anyway? Or do many (most?) of them hang in there for much longer? Your thoghts (especially from those 'in the trade' who see plenty of examples) would be much appreciated.

    Ian
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  2. 30th June 2008, 12:37 PM #2
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    Well I haven't bothered doing the head gasket, just changed the valve stem seals in situ as I had four 'floating' with the valve stems.

    I am about to do the injectors, as even though economy and power is OK, oil analysis (and it isn't being flagged at the lab) shows fuel minor dilution issues, and as my oil bloke said, at 240,00km they aren't going to get any better....

    It doesn't take much of a dribble at idle or shut down to create problems, and apparently a lot of oils aren't coping very well with some of the aromatic additive content of the modern fuels compared to three to five years ago.
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  3. 30th June 2008, 07:06 PM #3
    Gaz69
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    Head Gasket

    Hi Ian,
    There has been plenty of comments on here about head gaskets lately! The old man is nudging up towards 700,000kms on his 300tdi and that has never had the top off and one set of injectors. The motor does not use any oil between changes and is well maintained. If yours is running okay i would leave the head gasket.

    Regards Gaz
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  4. 30th June 2008, 07:44 PM #4
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    Quote Originally Posted by Gaz69 View Post
    Hi Ian,
    There has been plenty of comments on here about head gaskets lately! The old man is nudging up towards 700,000kms on his 300tdi and that has never had the top off and one set of injectors. The motor does not use any oil between changes and is well maintained. If yours is running okay i would leave the head gasket.

    Regards Gaz
    X2
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  5. 1st July 2008, 07:52 AM #5
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    mine has 320,000 on it and a mate has 500,000+ on his.
    2007 Discovery 3 SE7 TDV6 2.7
    2012 SZ Territory TX 2.7 TDCi

    "Make the lie big, make it simple, keep saying it, and eventually they will believe it." -- a warning from Adolf Hitler
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  6. 1st July 2008, 11:20 AM #6
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    Injectors though?

    Quote Originally Posted by incisor View Post
    x 3

    mine has 320,000 on it and a mate has 500,000+ on his.
    Is that on the original injectors though?

    Thanks
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  7. 1st July 2008, 12:07 PM #7
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    2007 Discovery 3 SE7 TDV6 2.7
    2012 SZ Territory TX 2.7 TDCi

    "Make the lie big, make it simple, keep saying it, and eventually they will believe it." -- a warning from Adolf Hitler
    "If you don't have a sense of humour, you probably don't have any sense at all!" -- a wise observation by someone else
    'If everyone colludes in believing that war is the norm, nobody will recognize the imperative of peace." -- Anne Deveson
    “What you leave behind is not what is engraved in stone monuments, but what is woven into the lives of others.” - Pericles
    "We can ignore reality, but we cannot ignore the consequences of ignoring reality.” – Ayn Rand
    "The happiness of your life depends upon the quality of your thoughts." Marcus Aurelius
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  8. 1st July 2008, 08:18 PM #8
    Defender=1st Guest
    anyone know how much 300tdi injectors are ?
    Cheers
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  9. 1st July 2008, 09:09 PM #9
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    Quote Originally Posted by Defender=1st View Post
    anyone know how much 300tdi injectors are ?
    Cheers

    ERR3339 Fuel injector - new Bosch - 300TDI
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  10. 1st July 2008, 09:11 PM #10
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    About $80 each from paddocks in the UK.But be careful, some people are reporting problems with new injectors (not necessarily rom paddocks thou). more info here power loss at top end - Land Rover UK Forums
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