guys, i am want to drop a diesel in my LV i have a lead on both a hz and a hd-t. i am putting a h55f behind what ever goes in any advice as to what to look for would be great.
HZ or 1-HD-t?
- Thread starter mderrick
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Both are great engines,but a factory turbo will always give a longer life(thats why they made them).
You gonna need to make sure it has no BEB problems which afflicted these engine blocks right up until 06(although it wasn't as bad as the early 90s)
High mileage on either of these engines may require a fuel pump rebuild,,many of them do need one before 300000klms.
If the pump has fuel seepage,it will need dismantling anyway
The engines will go 400000 klms+ if they have been looked after.
They should start cold within seconds and run smooth with just a flash of smoke.
Ask whether they are 12v or 24v. The12v is gonna be easier to work with.
You gonna need to make sure it has no BEB problems which afflicted these engine blocks right up until 06(although it wasn't as bad as the early 90s)
High mileage on either of these engines may require a fuel pump rebuild,,many of them do need one before 300000klms.
If the pump has fuel seepage,it will need dismantling anyway
The engines will go 400000 klms+ if they have been looked after.
They should start cold within seconds and run smooth with just a flash of smoke.
Ask whether they are 12v or 24v. The12v is gonna be easier to work with.
- Thread starter
- #3
BEB problems? i am new to deisel's.
thanks for the heads up anything else i need to be aware of? i think that both of these should be able to mate with a h55 right?
thanks for the heads up anything else i need to be aware of? i think that both of these should be able to mate with a h55 right?
1HD-T it's one of the most amazing engines that I ever drive .. ( and own ) but aditional to BEB's I will said turbo .. check it before drop any money.
- Thread starter
- #5
educate me.. what are BEB's?
Big/Bottom-end bearings.
You can do the search under "BEB" and you should be able to kill a few minutes of your time.
You can either replace them with supposedly improved OEM bearings or aftermarket units (The manufacturer name is something like ACL/ALC or something like that!)
Good luck!!
You can do the search under "BEB" and you should be able to kill a few minutes of your time.
You can either replace them with supposedly improved OEM bearings or aftermarket units (The manufacturer name is something like ACL/ALC or something like that!)
Good luck!!
Big (or Bottom) End Bearings. The bearings around the crank. The 1HDTs had issues with them going out early. Most people have done the swap to the newer style which are better, or budgeted in the cost when they price an engine or truck with this engine.
They are both good engines. You can turbo the 1HZ as well without too much issue. They make a lot of kits for it. If you choose the turbo wisely, it should perform as well or better than the stock turbo.
I do not have either of these two engines, but the 1HZ is known around the world as a super durable and reliable engine. This may be due to the lack of a turbo as a turbo can add a little wear to the life of an engine by increasing stress on the internal components.
They are both good engines. You can turbo the 1HZ as well without too much issue. They make a lot of kits for it. If you choose the turbo wisely, it should perform as well or better than the stock turbo.
I do not have either of these two engines, but the 1HZ is known around the world as a super durable and reliable engine. This may be due to the lack of a turbo as a turbo can add a little wear to the life of an engine by increasing stress on the internal components.
That's funny Mot, we both posted at the same time with the same info! Jinx!
Yes .H55f ,but you must have the correct input shaft. The 1HZ has a 21 spline count.
The 1HD T usually has a H150 or H151 ,the difference being the H150 has a lower ratio.(I think they are 14 splines)
You can bolt the H55f to the 1HD T,but it requires a mix of components including a Isuzu truck clutch disc.
The 1HD T has a bigger clutch,300mm as opposed to the 1HZs 275mm?
You can use the smaller clutch on the 1HD T
- Thread starter
- #10
now the h150 and 151, are those manual or auto? i would like to keep it manual..
Get the engine which is within your budget. HZ conversion to HD-T (12 valve, 1990-1995) can almost be done in one weekend. I would try to source a 300 mm flywheel and use it on either application with a H55 behind it (using the Isuzu NPR disk w/ Toyota HD-T PP).
As I have posted in the past, the starter motor in a HZ/HDT in a left hand truck is very close to a tradition 40 series steering box and you might want a saginaw or 60 series box conversion to eliminate that problem.
Not being familiar with diesels understand that you have a vacuum system to set up, as well as wiring, air cleaner, power steering cooler/hp line etc. I'd look over an install of a HZ or HDT before you jump in.
great engine, great power.....
As I have posted in the past, the starter motor in a HZ/HDT in a left hand truck is very close to a tradition 40 series steering box and you might want a saginaw or 60 series box conversion to eliminate that problem.
Not being familiar with diesels understand that you have a vacuum system to set up, as well as wiring, air cleaner, power steering cooler/hp line etc. I'd look over an install of a HZ or HDT before you jump in.
great engine, great power.....
- Thread starter
- #13
I already changed the steering, and was aware of vaccum system, air cleaner, and other periferial system changes. i just wasn't sure about the motor/trans bits.
thanks for the help.
so besides the turbo what is the difference between the hz and hd? i am guessing it is in the head? 24valve vs. 12 valve?
thanks for the help.
so besides the turbo what is the difference between the hz and hd? i am guessing it is in the head? 24valve vs. 12 valve?
The main difference is that the 1HZ is indirect injection and the turbo is direct injection. They also have different fuel pumps, injectors .
The turbo engines also came in 24 valve, 1HD FT and 1HD FTE,these also have some electronics attached to the fuel pump
There are other Toyota diesel engines that also may suit your purposes,al;though you are on the right track with the 1HZ and 1HD T
list of engines and specs
TLC FAQ - 5.4 Engine Specifications
If you run a hz or 12 valve HDT in the US you have many parts available as the hz block is used in cdn mine trucks and the parts mostly show up in the us system. Using 24 valve (HDFT and HDFTE, 1995+) there are systems that do not exist in the US/CDN so be aware. The same hold true for the H150/151 transmissions- which parts can be found but offshore.
rosco is right, direct vs indirect injections. HDT pumps and injectors can be rebuilt here in the US cheap (I had my pump overhauled for about $600 and injectors serviced w/ one new tip for $100) and the DENSO parts can be found. I just worry about a valve cover gasket for a 24 valve which might have to ship from Mot or Australia....
rosco is right, direct vs indirect injections. HDT pumps and injectors can be rebuilt here in the US cheap (I had my pump overhauled for about $600 and injectors serviced w/ one new tip for $100) and the DENSO parts can be found. I just worry about a valve cover gasket for a 24 valve which might have to ship from Mot or Australia....
there is any place in NA that can rebuild the both 1HD-T injector stages .. ?
- Thread starter
- #17
so it sounds like my best bet as far as parts go would be a 12 valve hz? and these can be turboed , does adding a turbo required the 24 valve head for the best results?
The 1HD T is 12 valve. No special head required for turbo but the direct injection method is favoured on nearly all factory turbo engines.
The factory turbos have a lower compression ratio and heavier pistons to cope with the demands of the forced induction.
To my knowledge , swapping heads is not feasible anyway.
As for parts,once these engines are set up correctly they go for a long time without needing parts.
Most parts ,if not available in north america,are only a phone call and a credit card away from australia or japan.
There has been a big improvement in parts availability american and canadian owners
- Thread starter
- #19
so in the process of adding a turbo to the HZ what is required? just a different manifold or should i be changing pistons and a bunch of other bits?
Yes.
Fred Holmes
I haven't looked for any alternatives but at one time they told me that they are the only ones "around here" that do the 2 stage injectors properly.