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· Registered
7 Posts
Discussion Starter · #1 ·
Hello fellow P38 enthusiasts here is one for you.
Has anyone ever swapped the 2.5 diesel for the 4.6 or 4.0 petrol engine and if so please tell me what exactly do i need in order to perform this vital operation and how much will it cost me to do so?
Thanks in advance!

· Administrator
5,765 Posts
Gearbox is the same on the diesel and 4.0 litre V8 but you would need to use the bellhousing and torque converter from the V8 to mate the two. 4.6 has a stronger gearbox but a number of people have swapped 4.0 litre for 4.6 engines, left the original gearbox and had no problems. If you were to drive it hard all the time then you may find the weakness but under normal use it shouldn't be a problem. You may have a problem with the BeCM to ECM data link and the engine wiring loom is going to be different so you would need to use the one from the V8 too. Fuseboxes are different as well so you may need to do some rewiring to get things working. As to cost, it will cost what it costs. If you have access to a complete car that is going to donate the engine and other bits and do all the work yourself, it shouldn't cost that much money, just an awful lot of time.

· Registered
1995-2002 Range Rover P38A
1,661 Posts
Things which are different off the top of my head:-

wiring harness (maybe only the engine harness)
engine ECU
gearbox ECU
radiator and hoses
fan and shroud
engine cooler
gearbox cooler
acoustic panels under engine and gearbox
fuse box
starter motor
torque converter
speedometer binnacle
front prop shaft

The maybe lots of other minor differences.

It is not a straightforward job and full diagnostics are needed. Nothing is impossible but I have never heard of anyone else doing it.
It is hardly economic and I certainly wouldn't do it. Petrol stays as petrol. Diesel stays as diesel.
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