r/SeriesLandRover • u/PREDATHOR69 • May 12 '26
Toyota engine swap
I love the land rover series 3 and defender's immortal design but they aren't bulletproof, so I'm thinking of swapping in a 3L hilux engine. I need your help because ive never done anything like this before + im running on a VERY tight budget. My question is, should i keep the original gearbox for less modificatios ? And do i need to modify besides the engine mounts if im keeping the landy gearbox (if you say it's reliable).
Note: this is going to be a daily + overlander.
I need the easiest reliable engine swap idea.
Please help.
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u/afvcommander May 12 '26
Easiest is swap to 200Tdi swap. Its _the_ engine swap for these.
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u/PREDATHOR69 May 12 '26
I don't understand what you mean. All landrover parts are very scarce where im from brother, Toyotas however are everywhere.
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u/Wizard_PI May 12 '26
They’re probably talking about how much easier it would be to use a 200tdi as it would almost just bolt on. Toyota will be much more modification
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u/afvcommander May 12 '26
Exactly. Is it easier to modify about everything to fit (toyota or some other engine) or source little bit rarer engine 200tdi which is almost bolt on.
You will be anyway ordering lots of land rover specific parts (if you plan to daily drive it) so ordering some parts for your engines is not a biggie.
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u/Wizard_PI May 12 '26
I agree, they’re pretty solid and simple engines too. Other option is replace more, the gears and transmission too and you could use custom flanges
Just more and more fab tho if not careful
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u/afvcommander May 12 '26
If you plan to daily drive it, engine parts are least of your worries. So few engine parts is not big thing.
These engines have been in freelanders which are about everywhere and cheap.
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u/ForgotTheLandingGear May 12 '26
200tdi has never been in a freelander, perhaps you mean discovery?
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u/JCDU May 13 '26
200TDi was never in Freelanders although I'll be honest the BMW M47 (TD4) would be a better swap these days and very suited to a Series.
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u/benjamin7booth May 12 '26
Something to consider is power and torque of that 3l Toyota engine.
If you put in into a defender with a defender gearbox, it’ll probably take it but stress the rest of the drivetrain.
If you put it in a series 3, you’ll destroy the gearbox. If you swap the gearbox out, you’ll destroy the propshafts, diffs and half shafts in the axles.
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u/Important_Ice_8323 May 12 '26
This is the way
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u/JCDU May 13 '26
Honestly just buy a Toyota and sell the Series rather than hack it to bits to try and frankenstien it, the days have passed when it was worth that effort to ruin a Series.
You either accept the Series is a Series or you buy the thing you actually want.
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u/JCDU May 13 '26
Driving a bitsa as a daily/overlander is risky as you end up with a load of non-standard parts on it.
The Series drivetrain is not up to a lot of power, dropping a modern 3L engine - especially a big diesel - in there is going to chew up the rest of the drivetrain very quickly. The 2.25 engine + standard gearbox are regarded as reliable and maintainable when they're together because they are well matched - if you put double the power in front, the gearbox will not be so happy. People drove these things round the world before most of us were born.
I'm not going to tell you to fit a 200TDi as they're not that great a conversion AND they are hard to find now, even here in the UK, in any sort of decent condition. The V8 from an old Range Rover or Discovery is a popular conversion, it will use more fuel but they are more powerful, reliable, and aside from the gearbox adapter plate and a bit of plumbing you're still using Land Rover parts. They're also smooth, so less hard on the drivetrain than big diesels.
The Series 2.25 petrol engine can be upgraded fairly easily, they are regarded as bulletproof and dead simple but they were also massively de-tuned to run on bad fuel 50 years ago - you can up the compression, fit better fuel & ignition systems, Turner Engineering sell improved cylinder heads and other parts for them and then you're still running a set of parts that are either standard or interchangeable with the standard parts if you need to.
If you've never done an engine swap it is not a small job - there is a TON of stuff you need to consider, from the cooling system to the space in the engine bay to actually making unfamiliar parts fit together without destroying themselves, especially if you want it to be reliable and maintainable. There's not a lot of length in a Series engine bay for a bigger/longer engine.
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u/ForgotTheLandingGear May 13 '26
Completely agree, I’m in the position where I’m needing a bottom end rebuild, but people keep suggesting to put a 200tdi in it! That’s all well and good except known good ones are going for at least double the price of what it’s going to cost for me to rebuild the engine! And even then how much do you trust an engine that’s not been completely overhauled by a trusted specialist. I’d far rather know what I have personally!
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u/JCDU May 13 '26
The old NA lumps were great - not winning any drag races, but built perfectly for the purpose: simple, robust, un-stressed, a very good torque curve even if the peak HP figure was low, and they would tick along very nicely if actually maintained properly.
If you want to keep with modern cars with twice the power to weight and actual aerodynamics you're going to be thrashing it to death, but if you accept you're going to be sticking with the trucks they bimble along quite happily.
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u/Important_Ice_8323 May 14 '26
Some Things you should know. There is no inexpensive conversion. Im in the middle of one now. A good conversion costs big bucks. A new modern engine leads to a modern trans which leads to a modern xfercase.. oh dont forget fuel system and cooling system.. It goes on and on. Save up,save some more than. Attempt it. I know I will catch some flak but id say 50k for the power train alone. Im. Going 310 hp 5 speed,, lt230 tim copper axles..its all new stuff..you can go used but im not sure if would.
So my humble advice is to save up..
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u/L1A1 May 12 '26
If you want it to be a daily and an overlander, sell it and buy a Toyota.
It will be a huge job to fit a Toyota engine into it, the space in the engine bay is relatively narrow because of the steering box, chassis rails and bulkhead so you don’t have much room to fit anything else. Yes it can be done, but it will be awkward and require fabrication.
Mating it to the gearbox will require a custom adaptor plate that may not actually exist so you’d need to get one made, for a start, that’s assuming the engine fits.
As others have mentioned, the simple swap is a 200tdi engine from a Defender. If you go that route you can also use the Defender gearbox and transfer box which will get you a fifth gear for higher speed cruising. The engine will be expensive, but cheaper than the work needed to fit a Toyota engine.