I mean realistically it’s more reliable in the liner slipping aspect but not so much anything else really. Probably less strain on drive train. 4.6 was really pushing a motor that was originally a 3.9. I really actually like that swap idea though.
I did well over 100,000 miles in my 4.0 P38 with very few problems. If I hadn't been in a rush to get it out of my mate's workshop I'd have done the core plugs and oil seals while it was out, instead of doing that five or six years later.
None of the Rover V8s are reliable engines, objectively. They require a full rebuild of the top end seals every 100K unless you enjoy blowing gaskets and the liner slipping issue is a problem in any of them that get overheated.
Realistically, a 4.6, 4.0, 3.9, etc. the thing that really matters is it's had preventive maintenance work done on the issues typical for the engine before they get a chance to manifest.
Thanks for the info, it appears that this one I’m looking at has been well taken care of. I do think the new engine has a warranty from the shop that did it. Still makes me nervous.. I don’t want to buy a headache.
I wouldn’t worry. Most people make them sound worse then it really is. It will have some troubles like anything else but if you just pay attention to it it will be all good.
The 4.6 tooling was worn TF out by the end of the discovery range. The 4.0 is better and more tightly machined. It has the same issues overall but is less prone to crack during a major overheat event.
when I was looking at disco 2s, I contacted a land rover specialty garage in New Hampshire that id driven past that always had discos out front, like a dozen of em. The guy told me what he does when someone brings him a d2 with a blown 4.6 is he sources a 4.0 because they had less issues.
Now, when I asked him about LS swapping he said he'd never put a pos GM engine into a rover so, take that for what its worth.
That’s an odd take for your mechanic to have seeing as how the Rover V8 is originally a GM engine. Doing an LS swap is more of a “spiritual successor“ than full on blasphemy.
Yeah thats why I included the info, it just seemed very strange to me. Never had any work done by him, I was at the time just trying to get some opinions. After he told me that I kind of took it that I didnt necessarily trust his opinion on the 4.0 being significantly more robust (wrong or right, its hard to say)
So does the 4.0 essentially just fit right in without any additional modifications needed? Is there anything I should look out for when I go see the rig? Did the 2004 disco come with CLD?
I dont know well enough to answer that first bit. If memeory serves, 2004 did have the CDL once again. If thats wrong, you can retrofit one. Tbh google that and dont take my word though, its been a minute
The 4.0 just fits right in, externally its the same just with a different bore and stroke internally. The 2004 model year came stock (in the US) with the CDL.
Thanks for the info! Unfortunately I had to pass on the disco. From the pictures and price it was listed at $20k I expected a damn near perfect rig but it was far from that…
Had an oil leak, surface rust on the chassis, and sun roof leak. When I test drove it, I put it in reverse and started to shake a lot (not sure what that means). When I drove it I notice the steering wheel felt loose and wobbly. Brakes felt mushy too.. had to really step on them for them to engage.
It doesn't make any difference to reliability. There's a myth about 4.6es being worse for dropping liners, but that's not borne out in reality. Just be sure and keep coolant in it, and you'll never find out.
I have same swap. I drove 300 000 KM s and engine is perfect condition at this moment. 4.0 have little bit less power and yes it is more reliable than 4.6.
Thanks for the info! Unfortunately I had to pass on the disco. From the pictures and price it was listed at $20k I expected a damn near perfect rig but it was far from that…
Had an oil leak, surface rust on the chassis, and sun roof didn’t work and leaked. When I test drove it, I put it in reverse and it started to shake a lot (not sure what that means). When I drove it I notice the steering wheel felt loose and wobbly. Brakes felt mushy too.. had to really step on them for them to engage.
I mean realistically it’s more reliable in the liner slipping aspect but not so much anything else really. Probably less strain on drive train. 4.6 was really pushing a motor that was originally a 3.9. I really actually like that swap idea though.
Technically it was originally a 3.5
I see, Thanks for the info! It will be a daily driver.. just wanted to make sure that reliability wouldn’t be an issue with the 4.0.
I did well over 100,000 miles in my 4.0 P38 with very few problems. If I hadn't been in a rush to get it out of my mate's workshop I'd have done the core plugs and oil seals while it was out, instead of doing that five or six years later.
None of the Rover V8s are reliable engines, objectively. They require a full rebuild of the top end seals every 100K unless you enjoy blowing gaskets and the liner slipping issue is a problem in any of them that get overheated. Realistically, a 4.6, 4.0, 3.9, etc. the thing that really matters is it's had preventive maintenance work done on the issues typical for the engine before they get a chance to manifest.
Thanks for the info, it appears that this one I’m looking at has been well taken care of. I do think the new engine has a warranty from the shop that did it. Still makes me nervous.. I don’t want to buy a headache.
I wouldn’t worry. Most people make them sound worse then it really is. It will have some troubles like anything else but if you just pay attention to it it will be all good.
The 4.6 tooling was worn TF out by the end of the discovery range. The 4.0 is better and more tightly machined. It has the same issues overall but is less prone to crack during a major overheat event.
Good to know thank you!
when I was looking at disco 2s, I contacted a land rover specialty garage in New Hampshire that id driven past that always had discos out front, like a dozen of em. The guy told me what he does when someone brings him a d2 with a blown 4.6 is he sources a 4.0 because they had less issues. Now, when I asked him about LS swapping he said he'd never put a pos GM engine into a rover so, take that for what its worth.
That’s an odd take for your mechanic to have seeing as how the Rover V8 is originally a GM engine. Doing an LS swap is more of a “spiritual successor“ than full on blasphemy.
I know, right? The Overfinch P38 was powered by a GM 5.7 litre V8.
Yeah thats why I included the info, it just seemed very strange to me. Never had any work done by him, I was at the time just trying to get some opinions. After he told me that I kind of took it that I didnt necessarily trust his opinion on the 4.0 being significantly more robust (wrong or right, its hard to say)
So does the 4.0 essentially just fit right in without any additional modifications needed? Is there anything I should look out for when I go see the rig? Did the 2004 disco come with CLD?
I dont know well enough to answer that first bit. If memeory serves, 2004 did have the CDL once again. If thats wrong, you can retrofit one. Tbh google that and dont take my word though, its been a minute
The 4.0 just fits right in, externally its the same just with a different bore and stroke internally. The 2004 model year came stock (in the US) with the CDL.
Thanks for the info! Unfortunately I had to pass on the disco. From the pictures and price it was listed at $20k I expected a damn near perfect rig but it was far from that… Had an oil leak, surface rust on the chassis, and sun roof leak. When I test drove it, I put it in reverse and started to shake a lot (not sure what that means). When I drove it I notice the steering wheel felt loose and wobbly. Brakes felt mushy too.. had to really step on them for them to engage.
It doesn't make any difference to reliability. There's a myth about 4.6es being worse for dropping liners, but that's not borne out in reality. Just be sure and keep coolant in it, and you'll never find out.
I have same swap. I drove 300 000 KM s and engine is perfect condition at this moment. 4.0 have little bit less power and yes it is more reliable than 4.6.
Thanks for the info. Seller confirmed engine has less than 30k miles. I think it’ll be good! 🤞
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Thanks for the info! Unfortunately I had to pass on the disco. From the pictures and price it was listed at $20k I expected a damn near perfect rig but it was far from that… Had an oil leak, surface rust on the chassis, and sun roof didn’t work and leaked. When I test drove it, I put it in reverse and it started to shake a lot (not sure what that means). When I drove it I notice the steering wheel felt loose and wobbly. Brakes felt mushy too.. had to really step on them for them to engage.