GEMS to BOSCH Range Rover 4.0 Engine Swap

[momentum59]

I wanted to know if is was possible to transfer an engine from a P38 Range Rover 4.0 to a Discovery II. I understand they are both 4.0 liters and have a similar build. I have an opportunity to buy a Discovery II with a bad engine and have an extra complete 4.0 Range engine I'm not using in my current P38. It has complete ECU, Harness, etc. I wanted to pick your brains regarding this, What do you guys know about this possibility?

I understand this is a GEMS to BOSCH swap. Will I be able to swap the blocks and change the intake manifolds and other misc. items with no problems?

[XtremeMarine]

It can definitely be done. The dealership did it with my 02' DII Kalahari edition. I overheated my Bosch 4.0, and burned a hole through a piston. I purchased a low mileage P38 Gems 4.6, and had my local dealer do the install. They also reprogrammed my ecu to understand it was a 4.6. Expensive to be done by them. If I had purchased a 4.6 Bosch ecu; I could have had an independent do the work, and saved a couple of grand in labor. But the difference was not only noticeable; it was amazing. Very happy I did it. More for the torque while off-roading in mud and sugar sand, than for any other reason. Note: they also had to reprogram the trans ecu to understand the 4.6 as well. Something about a different torque curve.

[1hank1]

The only difference in the two blocks is the crank position sensor mounting bracket.

You may need to use the 4.0 front cover (depending on what year you're getting).

It takes about 20-minutes to swap the crank position sensor mounts out. The new sensor bracket needs to be tack welded into place. But because it's aluminum, this may, or may not, be a little bit of a hassle.

You do not need to re-program your ECU.

[khooper]

I like the Bosch management system better than the Gems. Swapping requires a lot of time and money right?
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check out the crankshaft trigger kit

[TerryS]

Originally Posted by 1hank1

The only difference in the two blocks is the crank position sensor mounting bracket.

Doesn't the Bosch engine have crossbolted mains, and the Gems blocks do not?

[1hank1]

Originally Posted by TerryS

Doesn't the Bosch engine have crossbolted mains, and the Gems blocks do not?

4.0's are cross bolted, at least since 1997. I'm not sure about early 4.0's. I'm not sure about all 3.9's or 3.5's, but the 3.9's that I've messed with were not cross bolted.

[TerryS]

Originally Posted by 1hank1

4.0's are cross bolted, at least since 1997. I'm not sure about early 4.0's. I'm not sure about all 3.9's or 3.5's, but the 3.9's that I've messed with were not cross bolted.

My son's XD (#40, 4/97) is most deffinately not a cross bolted block. Must have been a mid year thing.

[Dominic]

All the 4.0 4.6's 1996 onwards are cross bolted even the late 1995 3.9 & 4.2's serpentine drive have the blank bosses on the block casting exterior have seen this on a softdash classic i did here despite having the smaller crank bearing plinths with a 1/2 gap to the walls - maybe it was something in the works to add the cross bolting as you can switch the cranks and bearings from a 4.0 to one of these 95 types, mind you one thing i find odd is that im rebuilding a TVR 5.0 from a Range Rover despite the fact that in the same production run the Rovers use the HRC2249 heads with the exposed intake valve's TVR opted to use the earlier HRC2210 with the small ports - which is really odd as you'd think they'd want to airflow the overbore as much as possible? anyone?.
Dom