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Thread: Oil Leaks in 300TDi

  1. #1
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    Oil Leaks in 300TDi

    OK, now that you have finished laughing, I have tried searching threads but oil leaks are such a cliche that there are thousands of posts, found nothing in "the good oil" either.

    The problem areas are :- the tappet cover gasket, it doesn't seem to matter what I do I can't keep oil in there.

    There is oil all over the oil filter/pump housing, it doesn't seem to be comming from the hoses, much. But is underneath everything.

    The one that worries me though is that oil seems to be leaking out around the fuel injectors or the bolts that hold them in or the pins the clamping plates rest on.

    Any ideas?

    Steve

  2. #2
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    Oil cannot leak out around the injectors - only diesel, but by then you would have exhaust gas coming out as well.

    If you have trouble keeping the tappet cover gasket (and elsewhere) leak free you may have too much blowby. Disconnect the breather hose from the tappet cover and see what the blowby is like.

  3. #3
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    The oil leak around the filter housing could be you have an old ''o'' ring stuck in the groove where the filter screws up too or the ''o'' ring on the housing where the oil pipe screws into,it's under the casting shaped like a bell. Pat

  4. #4
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    In order of what's probably happening:

    Separator - if the o-ring of the cyclone separator gets a bit iffy, blow by exits and does what it does - ends up everywhere ( assisted by the fan)
    P/N LLO 100000 (?) Try and use the LR part as I've tried standard metric and imperial o-rings and they didn't work too well.

    Injectors - the spill line(s) (those things that run between the injectors and thence back to the tank) can get loose. Dirt and diesel can look a little like oil - small cable ties on the ends can fix it or new spill line from a Mercedes Diesel mechanic. The whole line is MJN 100910, and I've seen a reference online $18 for a 350mm chunk ( DIY)

    Gasket - the rubber can get hard and fail and since the bolts are depth limited, it doesn't seal. Thence blow by escapes. Replacements are reasonably easy to find. P/N ERR2409

    Give the engine a tub with CT14 - you'll be able to see what's happening.

  5. #5
    DiscoGav Guest
    Does anybody know what the blowby limit specs are and at what rpm from landrover? Or where I can find them

  6. #6
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    Quote Originally Posted by DiscoGav View Post
    Does anybody know what the blowby limit specs are and at what rpm from landrover? Or where I can find them
    I doubt LR have a published spec. However real diesels have a pressure sensor in the crankcase which shuts the engine down if the pressure gets to 20 mBar.

    The Provent won't allow crankcase pressure to get above 50 mBar.

  7. #7
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    Whats a real diesel?. Pat

  8. #8
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    perkins, commer knocker, gardiner, to name but a few
    Safe Travels
    harry

  9. #9
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    Quote Originally Posted by PAT303 View Post
    Whats a real diesel?. Pat
    Motors large and expensive enough to come with factory fitted EGT and crankcase pressure sensors.

  10. #10
    DiscoGav Guest
    Haha, a "real Diesel" is an engine that consumes Diesel Fuel. A really expensive Diesel will have the crankcase pressure and EGT sensors and even some of these are still options.
    At work, I find the Cummins Diesels no matter how old have a spec, described in Inches of H20. thats the distance the crankcase pressure will push water in a manometer gauge via a discribed size orifice. and at a set rpm.
    an engine manufacture of any combustion engine must have a spec somewhere describing what crankcase pressure is excessive.

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