Can I fit a 4.0 to replace stuffed 4.6?
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Thread: Can I fit a 4.0 to replace stuffed 4.6?

  1. #1
    FRESHMAN ROVER
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    April 28th, 2019
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    PERTH, WESTERN AUSTRALIA
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    Can I fit a 4.0 to replace stuffed 4.6?

    Hi all,
    I sent my 4.6hse for diagnostics this week to see if they could get it started. The guys told me there was a mechanical problem with the motor and that it was locked up. Before I do lots of investigation, I do have a 4.0 parts car. Regardless of power etc, can I essentially plug and play if I swop the engines and gearboxes over?

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  3. #2
    JUNIOR ROVER
    Join Date
    December 31st, 2007
    Location
    West Sussex UK
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    531

    Re: Can I fit a 4.0 to replace stuffed 4.6?

    yes is the quick reply, though easier if it's the same type ie gems to gems bosch to bosch because of the sensors.
    2001 P38 Vogue

  4. #3
    Premium Member Escape's Avatar
    Join Date
    June 4th, 2007
    Location
    Belgium
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    1,183

    Re: Can I fit a 4.0 to replace stuffed 4.6?

    Yes, the 4.0 and 4.6 are interchangeable. You don't even need to swop the gearbox with it.
    It is a good idea to use diagnostics to set the engine ECU to the correct displacement and reset the adaptive values.

    Filip
    4.0 SE manual, 1997, 'Priscilla': current daily
    4.0 SE manual, 1995, 'Piper', built for offroad with tuned 4.6 on MS: lost in fire
    4.6 SE auto, 1995, 'Prue': awaiting attention
    2.5 DT manual, 1996, 'Paige': retired and stripped
    D90 TD5, 2005, 'Nessie' TR2 racer: sold

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  6. #4
    SOPHOMORE ROVER
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    November 10th, 2016
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    Tasmania
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    Re: Can I fit a 4.0 to replace stuffed 4.6?

    You can put the 4.6 crank in the 4.0, put the 4.0 pistons on the 4.6 rods, and you have a 4.6 with a higher CR

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