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Thread: 3.9 to 4.6 Engine Conversion

  1. 2nd September 2014, 10:41 PM #1
    Discovery70
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    3.9 to 4.6 Engine Conversion

    Hello Everyone,

    I am just in the midst of purchasing (from a reputable SA company) a Range Rover 4.6 (1994-1999) to implant into my D1.

    Myself and my mechanic that will be installing it into my D1 had a few questions that don't seem to gel together, as I have been told that the engine is just a simple swap and will not need to purchase any other equipment to complete the installment.

    The engine is having a new mild sports cam and a new timing chain fitted before delivery and the usual inspections carried out and comes wit a 3 month warranty.

    I was advised the engine is coming as a long block and all of my ancillary equipment from my 3.9 will just fit straight onto the new 4.6.

    So here are the questions;

    Will i need to upgrade my fuel pump or install a new fuel pressure regulator?
    Will my alternator, A/C compressor and power steering unit all bolt onto the 4.6 without any modifications?
    What serpentine belt will be needed or will the 3.9 one fit straight onto the 4.6
    Will the ecu need remapping or re chipping?

    Is there anything else that i should be wary about replacing on the second hand engine like water pump, thermostat etc?

    Any info if im doing the right thing would be great.


    Thanks in Advance.....
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  2. 3rd September 2014, 07:11 AM #2
    bee utey's Avatar
    bee utey
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    You will need to fit your 3.9 front timing cover, oil & water pump and front pulley assembly as a complete unit. The camshaft you're getting supplied has to be compatible with a distributor drive as no 4.6 was ever sold new with a distributor. You also need a spacer to allow for the longer crank nose, the supplier should tell you about it.

    You will also need to fit your 3.9 rocker covers, inlet manifold, injectors etc, sump and flywheel. There are minor differences in the dowels in the front of the block, and a dowel in the rear end of the 4.6 crank means you must drill a clearance hole in your flywheel/drive assembly to match. Accuracy isn't critical here as you won't be needing the flywheel for timing as is the case on the 4.6. There may be minor variations in the bolt holes in the heads but nothing that a drill and thread tap won't fix.

    As for the engine tune, it will run just fine with the stock ECU, fuel pump etc but you may consider doing upgrades in the future if you want the very best out of it. Aftermarket ECUs that also control the timing can be an expensive but rewarding hobby if you ever get that far. The 14CUX standard ECU is not easy to change unless you're dedicated to resoldering circuit boards yourself, like Dougal on this forum has done.

    93 Hard Dash, Spark Plugs and Fuses
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  3. 9th September 2014, 10:42 PM #3
    Discovery70
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    3.9 to 4.6 Engine Conversion

    Hi bee utey,

    Thanks for the detailed information that I was missing, I appreciate the direction and knowledge you posted.

    Seems like a pressure sale to me but will still be looking forward to the new implant.

    Would it be a good idea to replace as new components the oil & water pump and front pulley assemblies and serpentine belt for longevity?


    Thanks
    Max
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  4. 10th September 2014, 08:18 AM #4
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    bee utey
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    Replacing stuff for no good reason other than it seemed a good idea is not necessarily the best thing to do. Sometimes a new aftermarket part lasts a shorter time than a used OEM part. You should carefully inspect each part and replace it only if it is needed, then try to buy genuine or OEM replacement parts. There's plenty of junk out there. You are best off fitting a low water alarm, a cylinder head temp monitor or similar tool to warn you of potential failure.
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