Isuzu 4HE1 Swap (1 Viewer)

[jb BJ73]

pretty sure the only difference between the NPR & NQR is bigger axles and poss bigger brakes. i think they may have tuned the two motors differently but externally and internally they would be the same(that is if they are both 4HE1s-may be tubo on the NQR AND non turbo on the NPR). all the 4H motors are pretty much identical apart from different capacities, apart from the 4HK1 which has common rail and 4valves a cylinder. been wondering wether the head from a 4HK1 would fit on the older models, would have to find some injectors that would fit

 

[ozwallaby]

pretty sure the only difference between the NPR & NQR is bigger axles and poss bigger brakes. i think they may have tuned the two motors differently but externally and internally they would be the same(that is if they are both 4HE1s-may be tubo on the NQR AND non turbo on the NPR). all the 4H motors are pretty much identical apart from different capacities, apart from the 4HK1 which has common rail and 4valves a cylinder. been wondering wether the head from a 4HK1 would fit on the older models, would have to find some injectors that would fit

Even if the head fits, opening the 4valves mite make you think hard if the operating system is different.... good luk.. I do like the look of the 4HE1s myself.... I'll be watchin..

 

[astr]

For all those of you interested in the newer Isuszu engines (4HE1-TC and 6HK1-TC series), Matt has posted factory manuals for these on his site: Master Portal - forums.bauchan.org/Isuzu Manuals Thanks Matt

 

[seray76]

Thats what I thought. I think that you could use the 450 tranny, which would be ideal since it is designed for that type of engine and has lockup 2nd through 4th, but you would have to swap out the input shaft to make it work with the landcruiser tcase I think. Does anyone know how involved that would be?

Seray76- I hope that works out for you. If you do it, make sure to take lots of pics and all. . And if you don't mind my asking, what kind of price are you finding on that motor/tranny and do you know if it has the electronics intact and is running and all. Also, I think that the NQR is what the NPR turned into. Not sure though. I hope we don't have to lift the truck since it is a slightly bigger engine than the 4bd1t. Anyway, keep us posted for sure.

To answer your questions:
1)you would have to disassemble both trannys to swap output shafts. I have never rebuilt an auto tranny, only manual ones, but from what others have told me, it's fairly involved.

2)I found a truck that is running and has all of the electronics intact...I will be driving it home. The engine was just rebuilt by an isuzu diesel mechanic. He wants 6K for it but I think I can get it for a little less. I think it's a decent deal because I am getting the tranny, motor, and all of the electronics. Plus, I will be able to get some money back for the rest of the truck, and I don't have to worry about the motor since its been rebuilt. It ran super strong. All of the wrecked ones I have been finding are every bit that expensive and you never know whether the motor is worth a crap or not. Often times you end up rebuilding them anyway.

3) I won't be able to tell you for sure whether or not it would fit in an unlifted truck. Mine is already lifted. I will give you my best guess once I get it mounted though.

 

[ThePookieBear]

Sounds good. I wouldn't be opposed to a OME lift. I for sure AM NOT a big fan of the 4" lifts required for the cummins as my car has other purposes than just a trail rig. Thanks for answering all our questions and stuff. Hope it goes well.

 

[seray76]

I agree. I didn't want to lift my truck 4" either. I also have other uses for my truck...that's why I quickly shifted my focus away from the Cummins. I will keep you posted as progress continues.

 

[Tapage]

pretty interesting thread .. ( take time to read it here in the office ) looking forward to this swap with a 300 lb/p of torque engine .. ( that sounds incredible to me )

 

[Dougal]

I found some nicely relevant specs (official) on these engines.
Check how flat the torque curves are on the non-turbo engines.

Here're the official (Isuzu) plots of the 4HK engines.
4HK1 engine
4HK1 engine

Official (Isuzu) plot of the 4HG1 engine
4HG1-T engine

Official (Isuzu) plot of the 4HF1 engine
4HF1 engine

Official (Isuzu) plot of the 4HE1T engine.
4HE1-T engine

 

[lynchmob]

4HE is an interesting engine, but does anyone know how tall it is? With nearly 4.8 liters in a diesel 4 cyl (which are stroker motors) it seems like there would be issues similar (or worse) to the 4BT regarding the verticle size.

 

[ThePookieBear]

Crap!!! Anybody know how high it is compared to a Cummins? Also, I am now going to ask a question that I searched high and low for early on but was too embarrassed to ask lest I be blasted: Can the oil pan on these tall motors be cut or otherwise modified to clear diffs and such? (if this is indeed an issue) And if so, would the oil capacity that was lost from the said cutting and welding in of a piece to clear the diff need to be regained with a remote oil reservoir of some sort? I hadn't even considered the height that much as the 4BD's seem to do okay. Hopefully its all good.

bump

 

[ThePookieBear]

Hey guys. I figured I would reanimate this thread. Oddly enough I was the last poster a few months back. Has anyone worked on this swap anymore? There are many questions left unanswered. Has the output shaft been swapped to the AW450? Has anyone found out if it needs a lift to clear. Seray76, did you ever start your swap?

 

[ThePookieBear]

Hey, found some interesting info on the 4HE1. I haven't had time to wade through it all yet; many pages and I'm at school, but it covers the electrical and stuff I think. http://lilaw.info/images/Manuals/LG4H-WE-9691.pdf

Also, I found out that if you don't need a lift for the 4BD2T, then you most likely won't for the 4HE1. Its only .8 (yes point 8) inches taller and 1.6 inches wider than the 4BD2T. The only places they really differ is in length. The 4HE1 is 14.6 inches longer, although with our long I-6 engines, I doubt that would be a problem. Its 25 kgs heavier than the 4BD2T, 803 pounds total. I have a post here... Isuzu 4BD2T or 4HE1 - Cummins 4BT Forums that may interest some. So far, not much response. I may copy and re-post it up here. Thanks.

 

[astr]

Aux. Electric Vacuum Pump

I picked up a wrecked truck with the 4HE1TC with the intention of eventually swapping it in to my FJ62. Sorting things out, I found that it had a small electric vacuum pump in addition to the one on the back of the alternator. There is a "low vacuum" switch on the vacuum tank that turns on a "Brake" light and also turns on the vacuum pump. This pump may be an alternative for those who don't want to use the alternator vacuum pump. I is mounted in the cab, in front of the instrument cluster.

 

[LifeOverland]

Any more info on the 4HE1 Swaps? I'm getting a 62 and there's an NPR with the 4HE1 that needs to be rebuilt for $900 total truck and all. It got some Hurricane Katrina water though. Good deal? Swappable?

 

[astr]

Any more info on the 4HE1 Swaps? I'm getting a 62 and there's an NPR with the 4HE1 that needs to be rebuilt for $900 total truck and all. It got some Hurricane Katrina water though. Good deal? Swappable?

See this thread: https://forum.ih8mud.com/diesel-tech-24-volts-systems/268941-isuzu-4he1tc-into-fj62.html

 

[mountaincoolcruiser]

Isuzu 4HE-1 into a 96 80 series

Hey everyone,

Just wondering if this thread has gone anywhere? was the swap done?

There is a Guy "dustin" in Portland doning these swaps and it sounds pretty sweet compared to the cost of a Toyota Diesel. Still expensive but not Toy $$$. trying to find some pics and video of the 94 he converted.

Cheers

 

[Woofythewolf]

Sorry for reviving a rather old thread, but I thought I had some info to contribute to it. (and since these vehicles last a long time, I figure info relating to them is relevant for at least another 20-30 years).

Why I thought of this:

What I found strange about this engine is that the whole gear train that drives the cam/power steering pump/injector pump is located at the rear of the engine, not a the front as is usual. I don't know why the Isuzu engineers choose this arrangement.

I was reading today and found this which reminded me of the above:
"Rear gear rains are the most common gear train available on contemporary diesels. Torsional vibration is reduced at the flywheel end of the engine because the flywheel mass smoothes out crankshaft velocity changes. Gear train noise and wear is kept to a minimum with a rear gear train. More accurate valve timing and injection action is possible because more consistent camshaft speed is possible with reduced gear rattle" (Pg 331 from THIS).

Also:

Sorting things out, I found that it had a small electric vacuum pump in addition to the one on the back of the alternator. There is a "low vacuum" switch on the vacuum tank that turns on a "Brake" light and also turns on the vacuum pump. This pump may be an alternative for those who don't want to use the alternator vacuum pump. I is mounted in the cab, in front of the instrument cluster.

I got one of these trucks with a ruined engine (valve head came loose and chewed up the piston and the cylinder head), and I wanted to have brakes while maneuvering it around the yard. First I had to replace ALL the vacuum lines (the electric pump couldn't keep up with the little cracks at the ends from age), and even then I'd get 2-3 presses of the brake pedal until I had to stop and wait for it to catch up again. (not road safe if your ABS sensor cable tears on a stick or something and you have to pump the brakes)