2H HJ75 to 1HZ, anyone done this?

[sco_aus]

Im looking at replacing my previous owner not looked after 2H with a rebuilt 1HZ and wondering if anyone here has done this and what sorts of things are required.
It would seem to me to be relatively simple, however having done engine conversions on cars before, it never is.
Also, the reason for wanting to change the engine instead of the troopie, is that for the money, I would pick up a HZJ75 with a lot of K's for the same money as replacing the engine for a rebuilt one to last me a long time.

[wa trooper]

A few months ago, that exact same thought went through my head. I had an '89 troopy that i'd owned for 6 years and done a lot of work to, and grown attached to. The old 2h even with it's turbo on was slow as. A good mate of mine specialises in landcruisers so i asked him about the conversion.
After much discussion, it turned out it would be cheaper to sell the old girl and buy one with a 1hz already in.
To cut a long story short, for only $4k on top of what i sold my old troopy for, i now have a '97 troopy with 1hz, plus many other benifits (ie. lsd, disc brake rear etc), it even came with 9000lb warn, dual batts, ome susp. Just those extras alone would have cost me over 4 grand, so really got my new motor for next to nothing:truck:

[HDJ105]

I'd have to agree with WA trooper.

It's certainly "doable" as all the bits would be available "off the (Toyota) shelf" so to speak. However even buying the stuff s/h at the wreckers will be expensive.

You'll need all sorts of bits, from exhaust to bellhousing, radiator and shroud, etc, etc.

[sco_aus]

hmmm, yeh. I dont have a problem with the leaf suspension and the drum rears (i prefer them for handbrakes). Plus I have front and rear airlockers, which is part of the reason I want to keep it as they arent cheap and wont fit in a later model (i think).
I could sell the troopie for more than I bought it for, as the guy just wanted to get rid of it, which would help a lot, but I just want to see if anyone has actually done it and how much it ended up costing.
The good thing is I can do it all with the help of a friend, so labour costs are free.
Thanks for your advice guys, definately been taken on board.

[Muckinhell]

Maybe think of putting in a 12ht. everything just about the same cause it is basically the same engine, as mentioned in the thread about the best toyota motor ever made....

otherwise just buy a newer troopie and swap all the stuff over you like and then sell the old one off. Prob less involved mechanically.

I have thought about doing the same thing with my 80 series if i ever came across something extra special that would be worth swapping to 80 series wise like a sahara or something.

[landcrusier ute]

it is do able but see if you can get a harness for marks adapotrs to make life easier

[sco_aus]

Im not a big fan of the 12HT, its too gutless for what it is, Im definately starting to lean towards upgrading to a 1HZ troopie. Does anyone know if the air lockers would swap over from a HJ75 to a HZJ75? I have a 87, so I figure they should swap to a early 90's one? The lockers are my main worry at the moment as they arent cheap.
Thanks for the comments guys, keep em coming.

[RoddQLD]

I preferred my 12h-t (in my 60 series) to the 1HZ in my 80 series.
I never felt that my 12h-t was gutless, and it's certainly a more robust engine than the 1HZ.

Now that I have a Safari turbo on the 1hz I am happier with it's performance, but I'll be lucky if I get the 530,000 k's out of the 1hz. I also got better fuel economy out of the 12h-t than I do my turbo'ed 1Hz.

There was another 4WD Monthly member that fitted a 12h-t engine to his troopy and he was very happy with it!

[sco_aus]

hmmm, i really need to drive both to make up my mind i think. Anyone here live in Canberra and have either of these 2? I know someone with a 1HZ troopie, but getting a hold of him is another matter.

[sco_aus]

Ok, so after doing a lot of looking around on the forum, the 12HT is such a popular engine and quite economical, im starting to be steered towards that now. I do want a reliable engine and they seem to be the way. Plus I will have a parts engine then. Not to mention its a pretty easy conversion.
So, now I just have to drive both to make up my mind.

[HDJ105]

Ok, so after doing a lot of looking around on the forum, the 12HT is such a popular engine and quite economical, im starting to be steered towards that now. I do want a reliable engine and they seem to be the way. Plus I will have a parts engine then. Not to mention its a pretty easy conversion.
So, now I just have to drive both to make up my mind.

The 12HT was rated at 100kW & 315Nm, the 1HZ 94kW and ~280Nm from memory. In 1990 when the 1HZ was released Toyota had given the dealers a big speel about how good the new engine was, and how it was as good as the old 12HT.

The 12HT is quite unstressed, and there's more grunt to be had and still return better economy and longevity than the 1HZ IMO. The 1HZ does have a wider rev range though.

The 12HT is a good replacement for the 2H as it's basically a bolt in fit, unlike the 1HZ would be (not that it's impossible by any means).

Your challenge will be to find a decent engine at a good price. I'd suggest looking around at complete HJ61 vehicles and weighing up what else may be of use to you during the conversion and what else you could sell to recover costs.

[Muckinhell]

Then whack on an exhaust, intercool it, renew/reco the injectors and wind the boost up a little you would be easily getting 150kw out of it surely.

[bad_religion_au]

your rear locker will swap, the front won't. but i'm sure you could swap it/ sell and buy one to fit the smaller front diff.

or... easiest way would be to buy an ex mine or other similarly bodily stuffed one with a 1hz in it and then you've got everything for the swap