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Thread: High oil pressure, Is a worry?

  1. 1st May 2009, 01:31 PM #1
    Chucaro's Avatar
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    High oil pressure, Is a worry?

    When I took delivery of the Defender Tdi 300 it have a fresh oil and a unknown brand of filter to me.
    I fitted the VDO oil pressure gauge and the reading was 400 Kpa when cold and 250 kpa running at normal temperature @ 90 Kph on the flat.

    I have done an oil change now filling with Fuchs Titan 15-40 and fitted a Donaldson P550318 oil filter
    The reading now is:
    When cold 600 Kpa running at normal temperature @ 90 Kph 600 Kpa over 90kph can go over 800 Kpa
    Idling @ normal tempreature is 250 to 300 kpa

    I just wonder if it is something to do with the filter and most important if the pressure of over 600 Kpa can damage the seals?

    Your inputs will be appreciated.
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  2. 1st May 2009, 01:39 PM #2
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    Those pressures don't seem too high to me, but I am sure JC will have a definative answer. Maybe there is a problem with the relief valve in the pump. After rechecking, 800 kpa (116 psi) does seem a little on the high side.

    I wouldn't be concerned about seals failing, there are precious few (if any) seals that have to withstand the oil operating pressure.
    Last edited by BigJon; 1st May 2009 at 01:41 PM. Reason: More detail.
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  3. 1st May 2009, 01:41 PM #3
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    I have heard of excessive oil pressure blowing off oil filters, but not in a 300 tdi...
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  4. 1st May 2009, 01:54 PM #4
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    Thank you for your inputs, I am thinking in replace the filter for a Ryco and if there is not any diference in the presure then I will have a look at the oil presure relief valve to see if it is dirty.
    Any other sugestions are welcome

    Cheers
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  5. 1st May 2009, 02:03 PM #5
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    Hey Chucaro...
    I've got some used big-end bearings which would no doubt reduce your oil pressure

    Your welcome to them
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  6. 1st May 2009, 02:22 PM #6
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    Quote Originally Posted by brianwood View Post
    Hey Chucaro...
    I've got some used big-end bearings which would no doubt reduce your oil pressure

    Your welcome to them
    Thank you I will send you a PM and in the mean time I will make a small hole in one of the hoses
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  7. 1st May 2009, 02:23 PM #7
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    Operating presure on the original LR book:

    Pressure, engine warm at normal operating speeds ........ 1,76 - 3,87Kgf/cm2 (25 - 55 Ibf/in2)

    Quote: Oil pressure relief valve .................................................. .. Non-adjustable end of quote
    ..........I do not like this
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  8. 1st May 2009, 02:38 PM #8
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    In the book this valve is called oil temperature valve so the oil pressure valve is located on the hard part to reach
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  9. 1st May 2009, 02:46 PM #9
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    Oil relief valve

    Here is the bugger, I will have a look the filter first
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  10. 1st May 2009, 03:29 PM #10
    Panya
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    From Rave "If excessive pressure is indicated it can be caused by overfilling engine with lubricant, sticking oil pressure relief valve, blockage in breather system." I'm not sure a different filter would make such a difference?
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