Toyota 1HZ V 1HZTD Engine

Submitted: Monday, Oct 03, 2011 at 21:18

Member - Wayne B (NSW)

Hi all

I have a complete 1HZ engine spare and a 1HDT fitted in my vehicle.

I would like to know if the bottom end is the same as the 1HDT. Are there any changes or mods that have to be done to convert the 1HZ to a 1HDT bottom end.

I was thinking of rebuilding the 1HZ and then fitting the 1HDT head, fuel pump etc to the rebuilt engine. This way I would not have my vehicle off the road during the rebuild.

Cheers
Wayne B

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AnswerID: 466728 Submitted: Monday, Oct 03, 2011 at 22:18

Member - Anthony W Adelaide replied:

Hi Wayne,

I am pretty sure that the big end of the conrods are alot beefier in the turbo motor to cope with the extra power and would not be interchangeable. Crank and bearings may well be different too.

Check out LCOOL.org (Land Cruiser Owners On Line), lots of info and like minded people on there. You have to join but its free and well worth the effort IMHO

Cheers, Wooly

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FollowupID: 740825 Submitted: Monday, Oct 03, 2011 at 22:33

Member - Wayne B (NSW) posted:

Thanks for replying. I have posted on LCOOL as well just waiting for a reply

You could well be right about the rods ect.
Cheers
Wayne B

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FollowupID: 740830 Submitted: Monday, Oct 03, 2011 at 22:59

Member - Wayne B (NSW) posted:

Found some info on http://www.offroad80s.com/1hdt-head-on-1hz-block-t6479.html

Looks like Pistons and rods are different. Rods have larger piston pin

Any further info still appreciated
Cheers
Wayne B

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AnswerID: 466736 Submitted: Monday, Oct 03, 2011 at 23:05

fisho64 replied:

try the toyodiy website and look up the part numbers, that will tell you for certain.

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AnswerID: 466738 Submitted: Monday, Oct 03, 2011 at 23:28

Member - Joe n Mel n kids (FNQ replied:

i know it is not easy to search LCOOL but i posted the same question some time ago...
The block is basically the same, it does not have the oil outlet for the turbo supply or the drain tapped in, you simply tee off the oil pressure swith for supply and drain into the sump ... one thread on LCOOL has some really good pics eh...
The crank is supposed to be exacly the same, but you need to change the rods and pistons, both at available on EBAY ......
The head from the HDT also has some water plumbing and hoses ect to fit and change but very do-able.......
Cheers and good luck with it, i will be doing mine in the next 6-12 months ...
Joe

Us n the kids n our FZJ105 livin n wurkin where others are bustin to visit .... YES WE FINALLY SOLD THE 75 4 DOOR

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FollowupID: 740876 Submitted: Tuesday, Oct 04, 2011 at 16:23

Member - Wayne B (NSW) posted:

Thanks for that
I have been looking at various 80 forums and Looks like it can be done with some modifications.

Thanks again

Wayne B

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FollowupID: 740917 Submitted: Tuesday, Oct 04, 2011 at 22:59

pop2jocem posted:

Wayne

I was looking to do a similar mod to my 1HZ but I was lucky enough to find a low k 1HD-FT complete from a written off 1997 80 series.
While doing the research for a 1HZ to 1HD-T conversation I came to the conclusion that cost and off road time was, for me anyway not worth the hassle. The block and crank were no dramas but be careful of little items that could effect reliability such as oil spray nozzles under the piston skirts and changing the fuel pump over to suit the injection pressures of the 1HD-T injectors and the aneroid to prevent overfueling at low boost pressures. I am not sure if the oil pump is the same seeing as how you would need extra oil volume.
Having said that yes it does appear do-able but it may be easier and more cost effective to get hold of a 1HD-T or if you can find one a 1HD-FT and do a standard re-build while having the use of what you have.

Good luck

Cheers
Pop

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FollowupID: 740993 Submitted: Wednesday, Oct 05, 2011 at 20:15

Member - Wayne B (NSW) posted:

Thanks Pop

Yes I agree. I think I will rebuild my 1HDT when it needs it and not worry about converting the 1HZ.

Its just I have the 1HZ sitting in the shed and I thought it could be a viable alternative and I could take my time building it up and then swap the engines over when I am ready.

Thanks for your input

Cheers
Wayne B

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