4JB1-T into an 82 P'up.......

[overland47]

Hey guys....first post here. A buddy on another board turned me on to this board for info on my project.

First off, I'm writing from the USA, Olympia, Washington to be exact. I've been working on adapting a 4JB1-T into an 82 4x4 P'up in place of the very wore out, and horribly underpowered, C223. I just love the truck, and want a small 4x4 diesel truck for a daily driver. Be nice if we had something like that here, but we don't, so I decided to build my own.

I researched everything and decided on the 4JB1-T. I bought this engine used from Japan. Came complete with all accessories.....starter, alt, a/c pump, etc. Even the intercooler. Also included a 5 speed 4x4 trans complete down to the gearshifters. 2600.00 US shipped to my door...I think I got a pretty good deal. It looks to be pretty low mileage....very clean and runs like a top.

I have been posting details of the progress and pics on my website here- toughguyinc.com/isuzu.aspx

To make a long story short..... So far, I have removed the cab and bed to make the fab work easier. Plus I need to put a body lift on it to be able to close the hood (bonnet as you guys say ;D). While I have the cab and bed off I am painting the frame and rebuilding the suspension/steering. I have fabbed up a new rear crossmember. The front engine mounts fit just right. This weekend it is going in to have new drivelines made and custom made (probably 2.5") exhaust from the turbo back. I still need to get a new radiator and figure out what I am going to do about the hood scoop for the intercooler.

I am also replacing the clutch, water pump, front and rear main seals, and timing belt before I put it all together. My stuff seems to be fine, but it will be very easy to do it now before it's all together.

Once I get it up and driving, I will do a little playing with the boost, fuel, and timing. Already been down that road with an old VW diesel so shouldn't be too different. Just happen to have a buddy with a dyno ;D

Couple questions-

Is there anything I need to know about this engine. Particular problems? Things to watch for?

I have already removed the EGR. What is the butterfly flap in the intake manifold for? Is it fine to leave there and not use? I will probably get rid of the butterfly in the exhaust when I do the new exhaust. I want this thing to breath well.

Anyone know a clutch part number I can cross referance here in the US? I can get everything else I need from the tractor shop but the clutch. What are the chances of the clutch used in the 3.1 V6 in the Troopers here being the same. I'm pretty sure the disc and pilot bearing is the same but not sure the pressure plate is, or even if it bolts on, will it hold well enough?

Just wanted to share my project with you guys and say thanks for the awesome board here. Lots of info here. I have already found answers to alot of my questions.

-Anthony

[geeves]

If you know the C223 then the 4jb1 wont have many surprises. You have already got all the main ones. Only problem I can see is the removal of the EGR and how this affects your local emmissions rules. The Austrailian version of this engine didnt have them so you could tell your inspector that it never had them. Chances are hes never seen one of these engines so wont know any better.
The flap in the inlet and exhaust are for cold warm up. In Washington you might need this. It only works below 36F and consists of a switch on the dash and the right hand sensor on the thermostat. Once the switch is thrown these flaps partialy close untill the water temp reaches 36F There is also a pump timing advance controled by this sensor without the switch.
Dont know the clutch number but a lot of NPR Isuzu trucks used this engine with the 2wd version of this trans Might be worth a crack at a trucking supplies.
The new crossmember should be able to be unbolted as the trans normaly comes out the bottom. Chances are you wont need to do this for 10 or so years but you dont want to have to lift the body off again.
An awsome project Keep us informed how it goes

[James W]

Hi Anthony, good to see you made it here..... looks like geeves has answered most of your questions..... so all you need to do is paint it IH red when you are finished... Cheers, James

[overland47]

Thanks for the info.

Emissions isn't an issue here, yet anyway. I'll keep everything just in case. You're probably right though....nobody knows about this engine and what it's supposed to have. I'm good at playing stupid....I'll just say "Thats the way it came from the factory" haha

I guess I'll leave the flaps in for now, and decide later if I actually need them. It doesn't get too much below freezing for very long here.....cold weather starting is not usually a problem with my diesels.

The new crossmember will be bolt in for sure....I've already had to remove the C223 to change the clutch once and don't want to go through that again. Will probably run the exhaust over the top of the trans too so I won't have to mess with that if/when the clutch needs replaced.

Thanks again James.....unsure on the IH red however. Might be a little too "flashy".....