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Thread: 82 RRC P76 V8 transplant advice

  1. #1
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    82 RRC P76 V8 transplant advice

    I purchased a P76 V8 that had previously been installed in a Range Rover.
    It has modified engine mounts, Range Rover timing cover and water pump and even the thermostat housing has been modified to face the right direction for a Range Rover.
    4E8DAB54-2AAD-4306-ABEE-D2955380C054.jpg

    I have done this conversion before to a 75 RRC but I left the P76 timing cover and water pump as original and had the radiator inlet/outlets reversed.
    As the P76 water pump is very low I used a pair of Davis Craig electric fans do all the cooling. It had a mechanical thermoswitch in the top hose that you could adjust to turn the fans on at whatever temperature you wanted. They almost never came on even in summer unless you were stopped at traffic lights for an extended time.
    This is it during a rebuild to get rid of rusty sills.
    09D9DC42-514C-44D0-A5CD-D07ED0AAAD4F.jpg

    I have read recently that P76 V8 overheat in a P76, and the issue is even worse in a RRC, but by using a smaller pulley on the Range Rover water pump to run it about 20% faster the issue is reduced but not eliminated.

    So, do I use the Range Rover pump, or fit the (apparently larger) P76 pump and reverse the radiator connections ?
    My 75 RRC had power steering but did not have air conditioning. My current 82 RRC does have power steering and air conditioning (and It’s currently an automatic but may change to a manual).

    Anyone with experience in this conversion have any advice please

  2. #2
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    The P76 did have some early overheating issues caused by the original steel fan not being very efficient. That was sorted on later models with the use of a better fan with a viscus clutch.

    As the P76 gets on in age it can start overheating again as the engine and radiator can scale up by using the old tech coolants or worse just water. A descale flush usually sorts that out.

    I did a RR classic P76 conversion about 20 years ago and used the rover parts and didn't have a problem with overheating. It is basically the same engine after all, just a longer stroke and a little higher compression. The P76 water pumps are getting hard to come by and the are up there in price. Rover parts are so much cheaper and easy to get, so I would use Rover parts where ever I could. (Plus that leaves the Leyland parts for us with P76s).

    If you did get overheating issues you could try one of the waterless coolants. Bit pricey at around $250 for a fill.


    Leyland Car Owners -
    04 L322 Vogue V8 - Work truck
    07 Freelander 2 TD4 SE - The wifes
    74 Leyland P76 Targa Florio - Aspen Green
    91 Kawasaki GPZ900R


    Previous LRs = 78IIa series - 81, 93, 95 RRC - D2V8

  3. #3
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    Thanks FisherX
    Yes, when cruising it only takes a certain amount of power to push a vehicle along regardless of what engine is developing that power, so under those circumstances the Rover pump should suffice.
    I am also considering fitting twin electric fans (AU falcon or similar) as I enjoyed the tranquility with my old converted RRC. Amazing how much noise the engine driven fan makes.
    I have read where people fit a “Holden “ pulley of a smaller diameter to speed up the rover pump to equate to the P76 pump.
    Does anyone know what pulley is used ?.

    Regards
    Phil

  4. #4
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    4.4l engine internals

    I pulled the sump off to have a look inside.
    The bores still have a nice home pattern.
    Can anyone recognise if these are original pistons ?
    424C8327-6F51-41AE-A95A-CFBCAF0A8337.jpg

    I also took #2 main bearing cap off and measured the inside of the bearing shell and it is the original size.
    Do you think I should reuse them ?
    5A12B61D-1BB2-4774-B7A9-932268342283.jpg

    Main bearing journal.
    354FD79F-E95C-48AD-A5D8-56728E0CE44B.jpg

    Regards
    Phil

  5. #5
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    Oil pump

    My P76 engine came with a Range Rover front timing cover but unfortunately it is an early one with short (22.2 mm) oil pump gears.
    I have a P76 timing cover and the gears in it are 27.8 mm long which is longer than the “long” later model RRC gears that are 26.6 mm according to the Des Hammill book.
    I realise that the P76 gears are only ~1 mm longer, but it does equate to 4% more oil than the long RRC gears and 25% more than the short RRC gears.
    I either need to find a later RRC timing cover of I can fit a 5 mm plate cut to the shape of the pump and use the P76 gears (with appropriate gaskets, end clearance etc).

    8F534538-0AA6-4343-AF1D-4528648EE892.jpg BA70917B-F42E-40E8-8F59-E8F0D5F181C3.jpg
    All input welcome.

    Phil

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