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Disco 2 D2 4.0 V8 Engine Oil, Coolant and AC removal

Discussion in 'Land Rover Discovery' started by tom1979, Aug 26, 2020.

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  1. tom1979

    tom1979 Well-Known Member

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    Evening all,

    Picked up a 4.0 V8 D2 a few weeks ago and going through the usual fixes from previous bodges and also want to give it a good service. I've had a few 3.5 and 3.9 V8's in the past but this is my first D2 V8

    Looking at RAVE for the oil specification they give two - one of Low compression engines and one for High compression engines. There is no explanation of which vehicles this applies to. Can anyone enlighten me? One uses 5w30 diesel oil (high comp) and the other 10w40 (low comp).

    For coolant they specify the same coolant as for the TD5 - presumably this is just the normal OAT that I use in my TD5's?

    I am also looking to remove the air conditioning - this will just be an off road vehicle. I cannot find anywhere any mention of an idler that replaces the AC compressor.

    It seems quite sluggish for a V8, anyone have any tips to liven it up?

    Many thanks!
     
  2. Stanleysteamer

    Stanleysteamer Well-Known Member

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    Others will answer the rest, but when the AC is not switched on it just idles anyway, so I wouldn't worry about it for the moment!
     
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  3. discool

    discool Well-Known Member

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    There’s only one compression ratio for the 3.9 engine that is 9.35:1 either D1or 2, the oil grade is stated in your vehicles owners handbook but 10w40 is okay for that engine if it’s not burning the stuff, my 3.9 has been using that 10w 40 since it left the factory.
    OAT antifreeze is what I use and replaced every.

    I don’t find the V8 fitted in a D1 or 2 sluggish for what is, but after it’s just a load carrier.
     
  4. tom1979

    tom1979 Well-Known Member

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    21 years later the owners manual seems to have disappeared! This is the 4.0 V8 though
     
  5. discool

    discool Well-Known Member

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    I know what the engine is... also the difference between the two 3.9 engines.
    I believe that the owners handbook is available on line and is able to be downloaded.
     
  6. tom1979

    tom1979 Well-Known Member

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    are you saying the 4.0 and 3.9 are the same engine with subtle differences ? I’ve only seen what rave says.
     
  7. Henry_b

    Henry_b Waiting..........

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    20w50 Valvoline Vr1 for ngine oil..

    And yes the 3.9 and 4.0 are the same, the separation is the crank driven pump of the latter engine, which is much more efficient.

    Don't use 5w30..

    10w40 isn't recommended, most won't notice any issues until higher mileage.
     
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  8. kermit_rr

    kermit_rr Well-Known Member

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    They are the same engine but renumbered to tell them apart, for ancillaries, electrics etc
     
  9. discool

    discool Well-Known Member

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    Cubic Capacity is the same, but the D2 Thor engine is more than subtle, if your previous 3.9 engine was in a D1 you will have instantly seen the difference in the two, for a start there’s no distributor on the D2 engine, also Land Rover called it 4.0 just to differentiate between the old and new 1999MY disco, when back in 1998 the D2s were in the showrooms.
     
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  10. discool

    discool Well-Known Member

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    Suggest U look in the disco 2 owners hand boo, like the D1 there’s a whole range of oil grades listed.
     
  11. Henry_b

    Henry_b Waiting..........

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    5w30 all the way to 10w60

    Yes.

    10w60 and 20w50 being 2 ideals
     
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  12. JUKE179r

    JUKE179r Well-Known Member

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    - Check/Replace the air filter
    - Check the air intake tube hose isn’t a rats nest
    - Clean or replace MAF sensor
    - Thoroughly clean both sides of the throttle plate and inside the body
    - Thoroughly clean the IAC valve
    - Check spark plug condition and gaps at .040”
    - Check your HT leads are secured onto both the spark plugs and coil packs
    - Check for spark on all 8 cylinders
    - Remove the black plastic oil separator piece out of the RH valve cover and clean/replace it
    Or
    - Totally remove the black plastic oil separator piece out of the RH valve cover, toss it in the bin, THEN remove the black plastic nipple piece from the back of intake manifold and replace it with a metal PCV valve part #V288 and reinstall the hose.
    - if you have a dedicated Land Rover diagnostic tester, go ahead and reset the adaptive values for the engine ECU.
     
    Last edited: Aug 27, 2020
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  13. Stanleysteamer

    Stanleysteamer Well-Known Member

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  14. NPG

    NPG Well-Known Member

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    The following might help you identify the type of engine on your D2 vehicle -

    Capture.JPG
     
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  15. discool

    discool Well-Known Member

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    interesting for some possibly :)
     
  16. Bennehboy

    Bennehboy Well-Known Member

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    Need a new home for the A/C bits? Not sure if it's same compressor as TD5 but the other bits are likely identical...
     
  17. JUKE179r

    JUKE179r Well-Known Member

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    I despise using Dexcool coolant though others seem to prefer it for both the V8 and Td5 engines. I much prefer the Valvoline Zerex G05 HOAT yellow coolant for my Thor V8 (I don't know if Zerex is sold here in England). I've used their Zerex coolant for years in my Toyota Camry (V6) , VW Passat (V6) and BMW X5 (Diesel) with zero issues.
    G05 product info... https://sharena21.springcm.com/Publ...2d889bd3/c264d227-0dbd-e711-9c12-ac162d889bd1

    You will need to totally remove the 80mm idler pully for the A/C removal.
    If you have don't have ACE you can route the belt like in the below picture but you'll need a shorter serp belt.
    ERR6899 is the serp belt LR part number for no ACE/no A/C on a Thor V8.
    [​IMG]
     
    Last edited: Sep 2, 2020
  18. tom1979

    tom1979 Well-Known Member

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    Thanks for that, unfortunately ERR6899 is obsolete at our wholesale supplier. I'm going to try and find the Dayco belt reference and go from there. Edit, just found it, 7PK1766.

    It seems that 5w30 oil is for my engine (according to RAVE), and pretty much any other oil is fine too! But if 20w50 is what you recommend then I will go with that. Mileage is around 120k miles. I can get Exol 20w50 mineral oil quite cheaply
     
    Last edited: Sep 2, 2020
  19. Henry_b

    Henry_b Waiting..........

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    Rave can be a tad misleading, the auto gearbox rebuild section being among the worst!

    You'd be better off filling the sump with cooking oil instead of 5w30 ;)

    20w50 is the good stuff, it is an old engine by design :)
     
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  20. tom1979

    tom1979 Well-Known Member

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    The problem with these hand books is they were written in the 90’s when these vehicles were new. Fast forward 22+ years and what was recommended then may not be the best thing now
     
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