Defender 300 tdi oil pressure - Page 3





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  1. #41
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    Default Re: 300 tdi oil pressure

    In general the answer is that the spring rate stays the same.
    The spring rate is determined primarilly by the length and diameter of the wire, neither of which changes when the spring is streched.


    The stiffness of a spring is given by the formula:-


    k = G*d^4/(8*D^3*Na)

    where G = modulus of rigidity

    d = wire dia

    D = mean diameter of spring

    Na = number of active turns

    If you permanently stretch the spring you will reduce the mean diameter of the spring which in the formula is raised the cubed this will increase the spring rate.


    I copied this from another forum.
    I would replace.
    '07 Land Rover Defender 110 TDI 300 Kalahari (Meisiekind˛)

    84' Land Rover Defender 110 V8 4-speed Hardtop (Meisiekind) Sold after 12 years of fun and hard work




    The only thing needed for evil to triumph is for a good man to do nothing.

  2. #42
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    Default Re: 300 tdi oil pressure

    But this is the question i have.

    Can a relief spring fatigue to the point where it loses its spring constant(resistance) when it is warm?
    1996 300tdi Defender 110

    AND HE IS HERE TO DO SOME BUSINESS WITH A BIG IRON ON HIS HIP

  3. #43
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    Default Re: 300 tdi oil pressure

    I was once told that a spring can only go up and down 1 million times, then it's done.

    What I'm trying to say, it doesn't have an indefinite life.
    '07 Land Rover Defender 110 TDI 300 Kalahari (Meisiekind˛)

    84' Land Rover Defender 110 V8 4-speed Hardtop (Meisiekind) Sold after 12 years of fun and hard work




    The only thing needed for evil to triumph is for a good man to do nothing.

  4. #44
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    Default Re: 300 tdi oil pressure

    Quote Originally Posted by jfh View Post
    I was once told that a spring can only go up and down 1 million times, then it's done.

    What I'm trying to say, it doesn't have an indefinite life.

    Sorry I didnt see post 41 where you explain it.

    Yes i have ordered a spring and plunger from Land Rover centurion but still waiting , i asked lrxtreme to look at it as my car was in for gearbox shifting , wasnt quoted extra for it and they said what they are going to do.

    I was anyway replacing it in about two weeks when my parts arrive from Land Rover .

    New development:

    oil pressure more at 2000rpm than at 2500 rpm , think my relief valve spring is pap . and at 2000 there is less flow so less force pushing on the spring thus more oil pressure (0.1).

    If my new spring and plunger doesnt fix the issue I will just wait for my cambelt service to have a look at oil pump and housing.

    Thank you for the effort JFH i appreciate it.
    1996 300tdi Defender 110

    AND HE IS HERE TO DO SOME BUSINESS WITH A BIG IRON ON HIS HIP

  5. #45
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    Default Re: 300 tdi oil pressure

    Stretching something as critical as the oil pressure relief spring just means the workshop in question should be avoided. They're going to advize using shims next.
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  6. #46
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    Default Re: 300 tdi oil pressure

    You have two options do a skimpy job or a complete engine rebuild. I come a long way with rebuilding engines. Take it out. Measure, rebore, replace all parts out of spec. If you do change pistons balance rotating assy. Yes it is expensive but the only way to have a reliable engine. Remember changing rings and bearings is not a rebuild.
    There is noway that you are going to do a proper hone with the engine in the vehicle. Honing tools will come in contact with the crank if it is left in position. Only a honing tool will give a correct and effective hone pattern

    My Dad were a sern believer that recon engines does not last as long as a new one. This is one of the few things I have ever proof him wrong.
    You rebuild and engine, back yard mechanics do recons
    It is not what you buy its what you build.

  7. #47
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    Default Re: 300 tdi oil pressure

    Listen to Grips.
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  8. #48
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    Default Re: 300 tdi oil pressure

    Quote Originally Posted by jelo View Post
    Listen to Grips.
    My engine compression is still very good , well within spec. My car doesnt use oil and being 21 I dont have the funds for a full engine rebuild

    Tomorrow im going to replace my oil relief valve with a genuine LR one.

    If that doesnt fix the issue im going to with my cambelt service have the oil pump clearances checked and replace if needed.

    If the issue still persists after a new oil relief valve and pump/housing then maybe i will be able to convince my dad with a engine rebuild , not going to be easy though

    How much hours would be reasonable for a workshop to quote on changing an oil pump and housing with a cambelt service also?
    1996 300tdi Defender 110

    AND HE IS HERE TO DO SOME BUSINESS WITH A BIG IRON ON HIS HIP

  9. #49
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    Default Re: 300 tdi oil pressure

    Quote Originally Posted by antvz View Post
    - For me personally (and this is a personal choice and also depends on climate) 10W40 (or anything W 40) is too thin, although it is pretty much the correct spec (15W40 is the spec). But in my opinion, this oil should still give you very good pressures on a new engine, unless something is wrong.

    Some recommend 20W50 but I don't think you can find excellent diesel oils in this weight?
    In my old Tdi I used Castrol Edge 10W60 which could really take the heat and still had good cold viscosity. It's really expensive to fill a Tdi with this oil though! It actually didn't make much difference to running pressure, but did sort out the idle pressures. And the typical Tdi "tapping" noise was much less.
    .

    i have building more and more faith in Rimula 15W40. if you can't maintain minimum of 0.8 bar under any circumstances, i would seriously consider replacing the oil pump. while at it do a leak down test on the pressure relief valve and ensure that ideally it dumps by 4 bar latest.

    Land Rovers never die, they simply become organ donors!

  10. #50
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    Default Re: 300 tdi oil pressure

    Quote Originally Posted by Landyluvver View Post
    .

    i have building more and more faith in Rimula 15W40. if you can't maintain minimum of 0.8 bar under any circumstances, i would seriously consider replacing the oil pump. while at it do a leak down test on the pressure relief valve and ensure that ideally it dumps by 4 bar latest.
    My minimum pressure is 1.2 bar idle hot , my max pressure is 4 bar cold.
    1996 300tdi Defender 110

    AND HE IS HERE TO DO SOME BUSINESS WITH A BIG IRON ON HIS HIP

  11. #51
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    Default Re: 300 tdi oil pressure

    Time to get this thread active again.

    Just want to clarify a few things before i start stripping:

    1) 300tdi head , do i need to buy a new one once its removed? Can it be machined / different thickness head gasket? Best option?
    2) What are the actual oil pump specs , in the workshop manual there is metric and imperial , i you convert the imperial to metric its not the same , should i work off the metric?
    3) What make for : Head gasket / Head / timing belt kit / crank / bearings / oil pump.

    While engine is out :

    Anyone running a full size intercooler on 300tdi , can you comment on power / egt's etc OR and upgraded stock intercooler.

    Thanks
    Last edited by Niela; 2020/03/23 at 12:12 PM.
    1996 300tdi Defender 110

    AND HE IS HERE TO DO SOME BUSINESS WITH A BIG IRON ON HIS HIP

  12. #52
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    Default Re: 300 tdi oil pressure

    If the head is in spec IAW the manual, use it.
    But if cracking at valves refer to manual to discard.
    If warped out of limits, replace.

    Many skim the head but it's not wise. From the 300Tdi onwards no LR heads are supposed to be skimmed according to the manufacturer.
    Get AMC they are the best.

    Not sure about the metric vs imperial. Is it a big difference or just a little.

    I would go for the metal head gasket. Not sure about make, but get the best you can afford.
    '07 Land Rover Defender 110 TDI 300 Kalahari (Meisiekind˛)

    84' Land Rover Defender 110 V8 4-speed Hardtop (Meisiekind) Sold after 12 years of fun and hard work




    The only thing needed for evil to triumph is for a good man to do nothing.

  13. #53
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    Default Re: 300 tdi oil pressure

    Always run the biggest intercooler you can fit.
    2012 Jeep Sahara Unlimited 3.6 V6
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  14. #54
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    Default Re: 300 tdi oil pressure

    Okay I did a few conversions and it's small difference.

    But the overhaul manual only has metric.
    See attachment.
    Attached Images Attached Images  
    '07 Land Rover Defender 110 TDI 300 Kalahari (Meisiekind˛)

    84' Land Rover Defender 110 V8 4-speed Hardtop (Meisiekind) Sold after 12 years of fun and hard work




    The only thing needed for evil to triumph is for a good man to do nothing.

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