ok... i have an older 94 jeep wrangler i gave to my brother to use and he trashed the engine.. I was thinking of playing with it with a diesel engine.. I found a junkyard local that has an 99 ISB 24v in a wrecked truck he only wants 900 for the engine. I thought maybe i can plant it in the jeep because i use to love my old jeep before i got my current disel dodge ram. Has anyone seen this done or thought about it. The jeep had a 4.0 inline 6 with dana 60 rear in it but the engine chucked a rod through the block at 210,031 miles. I can just imagine the power you would have with a little jeep along with the increase in MPG the diesel engine would spare. I been thinking of upgrading my tranny so i can use the tranny i have now since the junkyard sold the auto tranny already and get my new tranny in my truck.

 

I have seen pics of one with a 4BTA. I have also seen ones with 6.2/6.5. I would think the ISB 5.9 would make that jeep awfully front heavy. But, that is a great price for the motor.

 

there is a YJ tub in Gainsville sitting on a 1996 2500 CTD nv4500 frame, rockwell 2 1/2 ton axles and 49" irok tires.... it is a really juiced up old 12v...with a 2' stack comming out of the hood ... i have seen that jeep ride a wheelie up a hill puoring smoke

 

A 24v 6 ISB in a YJ would require an entire driveline swap to realistically handle the power and weight .......frame and spring mods in the front would also be required to handle a motor that weighs 1050 lbs.....a 4BTA would be a much more realistic swap for a YJ.

 

Are 4BTAs still in porduction? What do they come in?

 

You might be able to find some NOS 4 BTA's in Cummins warehouse somewhere but I think they are actually out of production now......there is a 3.3 litre Cummins out now that is supposed to replace the old 3.9. You should be able to find a used 3.9 in an old Frito Lay chip truck or similar chassis vehicle.

 

There are some on ebay right now. Other than that, an old Frito Lay van would be your best bet.

 

are you sure the suspension would need that much alteration because the gross weight of the 4.0L says 817 lbs in the manual

 

alright i been looking into the weight difference.....the following are the weight of the 3 engines


4.0L Jeep 817lbs blown
3.9L Cummins 902lbs 5k+shipping
5.9L Cummins 1053lbs 900+cost of tranny

 

seems like the 5.9L would be a lot heavier than those other engines by more than just 200lbs!!

 

OK, you will have to replace the front end with a Dana 6o FOR SURE!!!! Also, look into some different springs for the front end. I would go SOA, and run some HD Rubicon Express 2" springs for the added weight OVER the axle.

Dima

 

why would i need to replace the front axle i seen people run V10 viper engines on rock crawler and such with stock front and rear axle

 

Anyone running a Viper V10 or a 5.9 CTD on stock D30/D35 YJ axles and is rock crawling and NOT breaking them is either leading a VERY charmed life or isn't having very much fun offroading.....I have seen WAY more than my share of stock YJ axles smoking ring and pinions, twisting axle shafts and bending housings and on and on - and this is often with the stock motor.....they are marginal axles at best when offroading......adding a motor with 2, 3 or 4 times the torque simply speeds up the process of breaking parts!

Although I can't come out and say the DC owners manuals is wrong, considering a typical small block chevy with an aluminum intake weighs in around 525 lbs and compresses the suspension at least as much as the 4.0 L when swapped in place of it, I find it hard to imagine it weighs some 300 lbs more.......heck my fully dressed 454 in my Jeep weighs 685 lbs.

Just look at the shear mass of the parts that make up a 1050 lb 5.9 CTD.....frankly, it simply dwarfs the 4.0 L.....to imagine that a 4.0 L weighs only 200 lbs (give or take) less than the CTD just doesn't seem right.

 

some reading for your pleasures
http://www.pirate4x4.com/forum/showt...hlight=cummins

http://www.pirate4x4.com/forum/showthread.php?t=85778

would also recomend a Dana 60

 

Interesting numbers last 6cyl i pulled was right at the 500 lbs mark im even thinking it was like 480 lbs with everything which would make sense since when i changed to an amc v-8 with cast iron heads my front sagged a little more. my amc V-8 with aluminium intake was a little less than 540. Have a scale on the forklift we used to use to install engines. Also when i installed my 12v cummins into my Ford it was almost 1250 lbs

here is a good weight comparison spread sheet
http://www.bulltear.com/forum/viewtopic.php?t=2646

the V-10 powered jeeps you have probably seen were in magazines and most definately had replacement axles because the d30 housing usually has issues with a mild V-8 and 33 inch tires. the rear Dana 35, is notorious for bending in stock form a truss would be required but then the torque rating of the axle shaft is less than that of a early cj.

FYI the V-10 powered blue jeep hasnt been able to keep a driveline together yet. to put a 6cyl cummins in a jeep 1 you will have to truss the front axle if you use a D44, dont bother with the D30 the tube thickness is too thin. also you WILL eat ball joints out of a D44 been there done that with a FS J-20 sporting a CTD or use a D60 it has the right capacity and larger shafts joints and ring gear. For a rear axle if you use the 6B use a Dana 60 rear the D44 ring and pinion doesnt have enough surface area to disperse the amount of heat created by the torque of the cummins nor enough pinion bearing to handle the driveline torque that loads up against the pinion. A D44 rear axle shaft will barely handle the off idle torque with larger tires.

Next you will have to cut the fire wall to set the engine in and to have enough room for a radiator and you will need an eletric fan infront of the radiator. lastly invest in sound deadening material for the firewall as the jeeps with diesel vibrate and have reverberating noises in the cab like you cant imagine.

I have seen the 24v installed in a toyota and i have seen it install in CJ's and in both cases ultimately it is so tight that the benefit isnt there especially with the driveline issues. I recommend a 4bt or go with a V-8 a BBC is a better fit and offers more balanced power than a 5.9 cummins in that small of a platform.

Dont get me wrong you can do it and i have done it but it has its drawbacks stock axles though wont get you far maybe in and out of the garage