AH64ID

Is it wrong that I find that arousing ????

Great motor choice, good tq.. good economy to from the trail...


Good call on ditching the TH400, good tranny but takes 60hp to run, and no OD... Have you thought about the NV 5600?? One extra gear between 1st and 4th(1:1)??

hamstrungtaco

i have thought about the 5600, but 4500's are easier to find, and advance adaptors makes an adaptor plate to a 32 spline 203 (doubler), this engine doesnt rev really high, but with the granny gear and 4:1 low range is more than enough for a diesel

hamstrungtaco

you dont need any chips or computer crap with this thing since its pretty much all mechanical, you adjust fuel with a diesel where as gas u increase air, that the beautiful thing about this motor, its simple and easy to work on

all_terrain17

Have you had the 4bt on a scale?

Excited to see this build!

AH64ID

oops.. .a little lysdexia

yeah they are a bit more rare... yeah you will still have a sweet bottom end...

harpen123

What was the 4 cyl cummin out of?

95RunnerSR5

the big frito lays vans you see drivin around town. they manage 24mpg on the stock setup i believe.

hamstrungtaco

as i recall from the bottom of the sump oilpan to the top of the aftercooler was around 31", its about as long as a chevy SB, except with around 4.020 bore and a 4.720 stroke, weighing approx 700lb which is why im fabbing up a new frame 1" taller than the old, but if u notice the whole crank assembly is mostly inside of the block, and the sump sticks down about 8" and the rest of the oilpan sticks down about maybe 2" giving me a lot of clearance for the axle, ill post some mor pics and get some more offcial measurements this weekend, none the less its going in there whether or not i have to modify the hood

nfenwick

Hello all, used to work for Cummins. The data plate on the drives side of the front cover has an engine serial number on it. It is an eight digit number number probably start with a 3, 4 or 5. You can take that number to any Cummins dealer and they can get you parts and other information about the engine. The only draw back that I recall about the B series is that they do not have removable liners. Other than that they are pretty bullet proof.

nfenwick

I forgot to mention. If you go to quickserve.cummins.com and get a password you can then enter the engin number and it will give you a parts breakdown of the engin as it left the factory. Unfortunately offen times the part numbers will have been superseceded multiple times. Part number games is one of Cummins favorite games to play. Hope that this is helpful. Oh, I would shy away from rebuilding turbos, injectors and or fuel pumps. Recon parts are available and are usually very reliable. Just my thoughts.

hamstrungtaco

yeah it only has 80,000 miles on it, i couldnt find any signs of shavings or deposit in the crankcase so theres really no need for a whole teardown, but for instance the timing pin had been sheered off and now i gotta take the whole cam out, and check pushrods and check for lifter wear. I ordered a parts catalog and shop manual for this and so now i got 3 books on this motor and its so easy to follow, my sister could prb rebuild this motor. but all in all its just cleaning up the motor and repainting and throwing new gaskets on it. right now im trying to figure out what type of flywheel will work on this thing since im going with a manual. turbo, starter, alternator im just going to replace, its such an awesome motor, very well laid out and easy to work on, unlike my 2.7 which has been very reliable, but i just cant stand working on toyota motors anymore, theyre bomb proof, but stupid to work on

hamstrungtaco

on a side note, rear axle is almost complete, new outers, and brakes, then a ÅÅÅÅ load more to do on the front 60, next 10 weeks are going to be slow, since im only working part time cuz of classes, but by march it will kick into gear by then since ill be done

bruzer1123

Any updates on this build?

Snipes4ever

That truck is gonna be sick!

SoCal4Running

The 4BT3.9 specs are

Bore 102mm[4.02in]
Stroke 120mm[4.72in]
Displacement 3.9liters[238in]
Engine weight dry (Less flywheel and Electric components) 320kg[705lb]
Firing order 1,3,4,2
Valve clearances Intake 0.25mm[0.010in]---Exhaust 0.51mm[0.020in]
Compression ratio 17.5:1
Rotation-clockwise
Minimum oil pressure at idle - 10psi
Minimum oil pressure at load - 30psi

Pearce951

Hows the build going? do you have the engine in the truck yet?

dannomite

You are killing us with the huge gaps and lack of updates. After an opening like the one you wrote you need to keep us in the loop

agusgus3

I know, but for us regular joe's, money doesn't fall out of my pants nor trees..
I'm finishing my build as my Staffords come in each quarter...HAHA, thanks uncle sam!

bigarms23

what gears are you using?

92yotaman

dang i really liked where this build was going, but i hope theres some updates soon