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Hi all - newb here on the Isuzus (but been turning a wrench for like 30 years on about everything else-I'm on MANY other gear-head internet forums too) and First, I want to say thanks for the forum here! It helped me diagnose and repair the glow plug system on a 1993 NPR with the 4BD1T engine for a customer that the previous owners AND a repair shop couldn't figure out. :D

Second, what the heck happened to the factory shop / service manual that is referred to many-a-times here on the forum and that sticky at top of this forum, but seems to have disappeared?!?? The one formerly hosted at the "bauchan.com" or whatever site. It is now an (annoying) "buy this domain name" placeholder site with nothing else to be found. *sigh*

I would G-R-E-A-T-L-Y appreciate if anyone can help me out with the .pdf of the service manual and/or wiring manual/diagrams and can gladly return the favor on many, many other types of manuals, if need be!

I actually sell OEM factory hard-copy service manuals, owner's manuals, etc. for everything from heavy equipment, cars & trucks, motorcycles, etc. etc on eBay and Amazon. Unfortunately though, I do not (of course, lol) have any NPR manuals, and REALLY need one to finish this job! I can in return, scan pictures, chapters, maybe even a whole manual if you need it-I have a REALLY nice scanner. I have all sorts of manuals desirable here like old Detroit Diesel manuals, Cummins (no 4BT right now though, damn), CAT, Isuzu cars/trucks, Ford and Chev/GMC diesels, Toyota diesels, you name it. I have manuals back to the early 1900s even and as new as the 2000s.

Please someone let me know if you have it ASAP (I need it in the next few days to get this job done) and what you need and I can hook you up. THANKS!!!

MoTo-Bunny / Jana
 

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I haven't made the jump yet to see if the eBay disc/pdf file is the way to go yet. But if I do try it I will let you know.
 

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Discussion Starter #3
I haven't made the jump yet to see if the eBay disc/pdf file is the way to go yet. But if I do try it I will let you know.
Yeah thanks, I saw all those bootleg CDs (and they are, there is no way they have the proper licensing for those) but I'm in the position that I need that manual YESTERDAY. I'm just trying to wrap up a customer's vehicle ASAP. Come'on, doesn't anyone here want to do a manual trade?? I REALLY need that manual to help me figure out the roached out wiring on this 1993 NPR....

As a side-note, I have to say, I am quite impressed with what I see in these engines. They seem to be a lot of power (torque) in a (relatively) small package and are pretty easy to work on since they don't have a bunch of electronics on them (I generally avoid working on anything later than about 1985-90 because of this!) Would love to put one of these engines in my 1973 GMC van, though it might be a pretty tight fit! (wish my van's cab tilted forward like the NPR, love that feature)
 

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93 4BD1T or 2T? I have a 2T manual from that link I can E-mail you. But you can find more info by searching this sub-form. Look for 'QOS' or 'QOS-II' or there abouts.
 

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Discussion Starter #6 (Edited)
93 4BD1T or 2T? I have a 2T manual from that link I can E-mail you. But you can find more info by searching this sub-form. Look for 'QOS' or 'QOS-II' or there abouts.
The owner isn't sure of the model year, he thinks 1992 but the decal on the valve cover has production date of 11/92, isn't that pretty late for a 1992? Sticker also says "4BD1T" on it, 238CID / 3.9L (but in cc). I realize the valve cover could have been swapped but I don't think so...everything looks bone stock and not really messed with (other than wiring). OH, almost forgot-the decal also says "meets 1993 California emissions" or something to that effect.

I will take a picture tomorrow and post it to be sure, though. The injectors being "bolt on" or the other type is a good visual ID, I guess? (again from another post here)
 

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Discussion Starter #7
Here's what I have been doing so far on the NPR, by the way, been going through all of the ground points and cleaning them up. Chasing the threads, wire-bushing the terminals, adding dielectric grease, etc. They are all really bad and corroded-haven't seen this much rust and corrosion since I lived in Michigan! This truck must have been near the coast for a while, or something.

NPR_added-ground-S.jpg

Also added this much needed larger cab to frame ground strap today (picture above), going to add a few more 10gauge wire grounds too, on other locations. I am convinced a lot of the weird electrical problems on this truck are due to bad grounds (I have seen this soooo often on older vehicles).
 

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Sorry I can't help. Like many others here, my interest is in the Isuzu engine, not Isuzu trucks, but I did download one truck service manual, because it included some gearbox info that I wanted to see, however it is for 1999 to 2001 model with 4HE1 engine, MXA and MBP gearbox, and Aisin 450-43LE automatic transmission. I have some engine and gearbox manuals, but nothing with what you are after.
 

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OK, big update as I have engine and specs sticker pictures. Apparently, my old eyes didn't read the grubby specs sticker very well as it says made in 11/93 and 4BD2TC once I cleaned it off! *doh* The owner also finally found the title and it says 1994, So yeah it's a 1994 NPR with 4BD2TC, THAT'S the manual I need very much.

4BD2TC_specs-sticker.jpg

Also, I finished chasing/cleaning all the grounds the other day and the awful looking battery terminals and cables. Also fabbed up a temporary fusible link out of bulk fusible link wire and a couple of connectors and added several more grounds as well as a battery cable linking the battery neg cable to frame to the transmission ground cable. THE NPR STARTED RIGHT UP AND ALMOST EVERYTHING IS NOW WORKING GREAT!!

All the dash lights that were on and just stayed on now are now lit only on the first few seconds on startup and then go out. The starter motor also audibly cranked faster and the owner said the headlights look much brighter. Only things still not working are the coolant temp gauge (probably just needs the sensor replaced?) and the wipers (motor is getting juice but is hot and not moving anything-possible jammed? otherwise replace it, I assume).

I still have a bit to go and the owner wants me to do a tune up and check the turbo, etc. so I could still REALLY still use that manual! Also, I can gladly host the 4BDT1C & 4BDT2C manuals on my website for awhile, so people can get it again here, if you guys want?


(By the way, I have tried to post some more pictures here repeatedly but I seem to be ridiculously limited to bandwidth for some reason nor can I just reference pictures from my website, either. I keep getting messages that I either exceed the upload limit (no matter how small I make the pictures) or can't yet post pictures hosted elsewhere. Never been so handicapped on a forum before, kinda sucks-just trying to help others by posting pictures of the fixes I figured out and what not. Don't mean to rant just really frustrated and that is why it took me so long to post here again, I just kept giving up after getting the same stupid messages again and again, lol).
 

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Sorry I can't help. Like many others here, my interest is in the Isuzu engine, not Isuzu trucks, but I did download one truck service manual, because it included some gearbox info that I wanted to see, however it is for 1999 to 2001 model with 4HE1 engine, MXA and MBP gearbox, and Aisin 450-43LE automatic transmission. I have some engine and gearbox manuals, but nothing with what you are after.
I hear ya, I am working on the truck for a friend. I think it's a pretty well designed truck and I am pretty impressed with how simple it actually is. My old man has talked about picking one up for a few years so might end up with one yet. However, it is the engine I am more interested in, as well-pretty simple and relatively compact plus an amazing torque rating.

I'm always keeping an eye out for smaller diesel engines useful for a future swap into my van (1973 GMC) or older service truck I am going to eventually pick up. I love the older vans and trucks (like 1974 and older) due to their ease in maintenance and cheap parts but they weren't really doing diesel in them, back then.
 
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