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P38 Diesel. What engine temperature is normal?

Discussion in 'Range Rover' started by Larsern, Aug 18, 2017.

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  1. Larsern

    Larsern Member

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    With timing at 0.80 I had to give more trotle to drive. Now with 0.90 less trotle for the same roads. Fuel conumation down from average 13.4 before to 11.8 now pr 100 km. Timing modulation with 0.80 around 75% now just below 50%. All in all starting to like the old bugger again.
     
  2. wammers

    wammers No longer with us, RIP Donater

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    You obviously don't understand the explanation of how static and dynamic timing are related. Having to apply more throttle with static at .80 mm rather than .90 mm is nonsense.
     
  3. Grrrrrr

    Grrrrrr Technician, Bodgit & Scarper Ltd Full Member

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    Put the trace in the What did you do to your Range Rover today thread as couldn't remember this thread's title!
     
  4. wammers

    wammers No longer with us, RIP Donater

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    Just an additional comment to round things off. The static timing set at .80 mm CANNOT cause the OPs stated problems, and changing the static from .80 mm to .90 mm cannot rectify them if they existed, is not possible.
     
    Last edited: Nov 21, 2017
  5. myfirstl322

    myfirstl322 Well-Known Member Full Member

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    Hoots mon...
    Ok ok......;):eek:

     
  6. wammers

    wammers No longer with us, RIP Donater

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    Do you have a problem with correct information?
     
  7. myfirstl322

    myfirstl322 Well-Known Member Full Member

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    Hoots mon...
    Certainly not dear @wammers , God forbid.
    Merely injecting humour, :);)
    There is NO charge to you, stand easy.

    Hope you are recovering ok, Whatever was up.
     
    Last edited: Nov 22, 2017
  8. wammers

    wammers No longer with us, RIP Donater

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    The OP does not realise how static and and dynamic timing are related. The static setting only applies when the engine is not running and there is no internal injection pump pressure. Spring pressure on the timing device piston causes the movable cam to revert to this static setting when the engine stops and internal pressure bleeds away, to give a slightly advanced point of injection for start ups. The engine NEVER runs at this setting unless the static timing is so far out that the timing device at maximum travel in the appropriate direction cannot set dynamic timing to TDC. Running problems as described can only be valid IF the static timing is so far out in either direction so as to take the modulated correction outside the scope of movement of the movable cam. 0.80 mm static timing retard causing 75% modulation as stated by OP does not fall into this window. His engine would have been running with a point of injection at the ideal position of 1 or 2 degrees BTDC as measured at idle speed (750 rpm + or - 50 rpm) with a warm engine as corrected by timing modulation. Therefore his problems CANNOT be subject to the 0.80 mm static timing. The four thousandths of an inch or so discrepancy in cam lift is neither here nor there. Feeling a bit better today thanks. ;)
     
  9. Grrrrrr

    Grrrrrr Technician, Bodgit & Scarper Ltd Full Member

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    Good to see you back @wammers and as always a pleasure hearing the details of how these things work.
     
  10. ned_

    ned_ Active Member

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    Millions of years later, I spotted this thread.

    I'm getting temps between 88 and 92, it has gone up to 100 I think, driving up this mountain

    upload_2021-4-3_1-46-6.png

    I have no idea what's a dangerous temperature for this engine, does anyone know?

    I have my electric fan kicking on at 92 degrees C, and I feel like I might be over-working that fan, it's on quite a lot, even in winter. My engine is pretty sweet, its in very good condition.
     
    Last edited: Apr 3, 2021
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  11. RangeRoller dt

    RangeRoller dt Well-Sprung Member

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    You don’t need to panic too much with an M51 in good order. If the needles at 12 it’s fine, I’ve had mine all the way up in the red few times and no issues.
    Things to be careful about are stat, water pump/belt/tensioner/pulleys/fulcrum, baffle in radiator. The original viscous fan gives incremental cooling whereas the electric goes on at a certain temperature then off so you can expect a little erraticness around the warm up point
     
  12. Mark Piercy

    Mark Piercy Well fumbled member.... Full Member

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    My electric fan is set at around 97°.;)
     
  13. dubbleRR

    dubbleRR Well-Known Member

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    On the head of a diesel ,Not sure what year there a sensor thats suppose to bring on the aircon fans at 105c to help cooling ....IF you have aircon and a sensor ,Dont know if it registers an overheat ,nanocom might tell you ,iv though about changing the sensor for a lower set point so it would work at ,say 100c :rolleyes: just a thought :D:D
     
  14. Mark Piercy

    Mark Piercy Well fumbled member.... Full Member

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    Towards the rear of the head 99 onwards. It's a black sensor. ;)
     
  15. ned_

    ned_ Active Member

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    cheers Mark, DubbleRR , good morning to you both.

    So I did some reading besides, and it seems the the engine can safely reach 110° C, and after that the water is going to boil.

    Mark did you change your thermostat when you changed the fan On temp, or is that not necessary?

    Fascinating really, the dynamics of a cooling system. @RangeRoller dt I did not know the viscous engaged incrementally, that's really interesting.


     
  16. Mark Piercy

    Mark Piercy Well fumbled member.... Full Member

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    The viscous fan is subtle and will keep the edge off the heat unless it's desperately need were as it'll sound like a jet engine.
    Te thermostat is a adjustable unit that either feeds I to the rad top hose or as mine is fitted and glued into the rad fins so no chance of leaks.
    I set it using the nanocom engine temp section. The thermostat has a guide in it but isn't very precise.
    Other than that everything else is standard. :)
     
  17. RangeRoller dt

    RangeRoller dt Well-Sprung Member

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    And now irrelevant to you lol. :D
    If you get the engine really hot itl go into a limp mode where you can tell something is catastrophically wrong. Main thing to suffer from being overly hot is the head.
     
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  18. Mark Piercy

    Mark Piercy Well fumbled member.... Full Member

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    Afternoon my mate, how's things on the ranch dude? ;)
     
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  19. RangeRoller dt

    RangeRoller dt Well-Sprung Member

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    Happy Easter Mark.
    I’ve been looking forward to the 4 day bank holiday to sort the P38 a bit but I’m sick as a parrot. Just my luck :(
     
  20. Mark Piercy

    Mark Piercy Well fumbled member.... Full Member

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    Happy easter to you also kid, what's up with you, are you 38' love sick?
     
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