Is it worth swapping out my worn 2.25 D for a 2.5 D

Hi Guys
Only want answers for changing to a 2.5 na Land Rover diesel,(not a 200tdi or a v8 or any other engine or manufacturer) please.

I have to pull the engine on my series 2a which was originally petrol but I replaced the worn out petrol lump with a 2.25 diesel series 3 engine about 25 yrs ago. I have been having issues with the engine so am going to pull it out and investigate.

I want to try and stay sympathetic to the series Land Rover so don’t want to put a 200tdi in it.
I have thought about replacing it with a 2.5na diesel engine. I do have a petrol 3 bearing engine and have thought about putting it back to what it was, but i’m worried that the cost of petrol will put me off driving it.

I say this as I live on the south coast but want to do some green lanes in wales and other parts of the country with a roof tent and may be some exploring into Europe and may be Morocco and Tunisia one day (probably won’t happen but it’s a dream)

I like the fact the Land Rover is Tax and MOT exempt so this is a consideration in changing the engine to a 2.5.

My question is does the 2.5 make much difference over the 2.25 in terms of drivability,is it as reliable as a 2.25, is it easier to tune up (eg fuelling), is it a bit smoother, quieter, and torquier then the 2.25 will it give me a bit more grunt off road when tackling some steeper trails in wales and Scotland. I know it is still a noisy slow and under powered engine but is it better then the 2.25 or should I just rebuild my 2.25 and stick with that.

Cheers

Petrol is much cheaper than diesel right now and i don't think that's going to change. The petrol is also a bit more economical than the diesel and easier to drive, quieter too. Your fuel bill will go down a bit

The 2.5 is based on the later 5 main bearing 2.25 68HP unit and while not exciting in power in good order will give about 10hp more and about 15 more torque LBFT. Nice thing it is pretty much a straight swap.
A petrol 2.5 will be about 83HP 133 lbft [ about 18 more HP more than 3 bearing unit] and be quieter to drive.
Re @kermit-rr above while petrol will use more fuel its price fair bit lower than diesel at this time.

Just done that swap.
Running a series type timing cover with a chain drive to the cam.
Running a 2.25 type injector pump in the traditional position.
Runs great.
Visually it looks just like a five bearing 2.25 diesel.
Only problem is you need the torsional vibration damper type front pulley off the five bearing engine.
Genuine ones about £250+
The were some pattern ones around, but I think I bought the last two.

As you didn’t mention the 200di, here it is, I also didn’t want to go to radical and keep it a simple swap
My swap keeps battery and oil bath filter under bonnet uses same engine mountings, gearbox, exhaust without the extras of oil cooler and turbo leaving lots of access still under bonnet