The CUCV Build-1986 M1031 Mobile Field Maintenance Assault Vehicle

[XJSuperman]

She's dead! Get a 6.5 crater and fix er up!

 

[M35A2]

So sorry to hear of the engine problem.

You do realize that had that seat (or that fellow's trousers) been camo, OD, black or chrome that none of this would have happened.

Seriously, truly sad news.

Does the motor turn over? Is it bearing material or ferrous material in the oil? How easy is it to remove the pan for a look-see?

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Edit: If the motor is truly dead, would you consider converting to a gasoline engine? Perhaps a carb'd SBC or BBC? That would solve the power problem and you could go back to the taller tires.

 

[chilliwak]

Ityoo am sorry to hear about your engine problems. I need to replace an injector pump and electronics on a 92 6.5 when I get back so I know about what costs can run into. At least you have gov auctions for the cheap stuff. Although the quality varies you should be able to find a decent 6.2 cheap. The best of luck and we all are with you. Best of new engine health to you....Cheers, Chilli...

 

[emtmark]

Cummins swap that bs boy and never look back


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[k9lestat]

Did you throw a rod?

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[PlethoraOfGuns]

Stuff happens, you just gotta move forward. She may very well be dead. A 6.5L would be nice. A 6BT would be better. An SBC or BBC in a 10,000# truck would not be very fuel efficient. One thing to keep in consideration is the pto generator setup that we don't have time to mess with a custom fabrication job. This truck is already supposed to be on a road out west...
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She wasn't going anywhere under her own power, so got her towed.
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Her new home for an undesignated amount of time.
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Too lazy to remove the pan to investigate. It was easier just to pull the engine, I think...
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Hmmm, what goodies await us?

 

[emtmark]

Assuming the block is the only casualty a junkyard swap would be the fastest but most uncertain. There's time for doing it right or there's time to do it over. We don't always have time to do stuff right but we can choose how often we do stuff over. Keep us in the loop. I've had horrible experiences with the 6.5td. Do the research and chart a path we can help as you go or give info with enough heads up.


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[XJSuperman]

The Cummins would be awesome. Do you have the 3-4 grand to get one? Or a 6.5, which would be easiest I think. I can't remember reading about it, but are you on Steel Soldiers? Lots of resources there, people, parts, ideas, etc. But you already know that if you're on there (I apologize if you are).

The gasser would be a simple engine, but I agree, not worth the fuel consumption. Can't wait to see whats inside!

 

[PlethoraOfGuns]

Assuming the block is the only casualty a junkyard swap would be the fastest but most uncertain. There's time for doing it right or there's time to do it over. We don't always have time to do stuff right but we can choose how often we do stuff over. Keep us in the loop. I've had horrible experiences with the 6.5td. Do the research and chart a path we can help as you go or give info with enough heads up.


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I like your logic. Most times it's better to take time to save time. For an expedition rig, I would personally stay away from turbo's. They do add cost and complications. I never had one, did fine without one, don't think I need one. If your out in the middle of nowhere and your turbo melts or a hose or tube breaks or whatever, you might not be able to find a replacement part at the local salvage yard or parts store. Sometimes it's better to be stock.

The Cummins would be awesome. Do you have the 3-4 grand to get one? Or a 6.5, which would be easiest I think. I can't remember reading about it, but are you on Steel Soldiers? Lots of resources there, people, parts, ideas, etc. But you already know that if you're on there (I apologize if you are).

The gasser would be a simple engine, but I agree, not worth the fuel consumption. Can't wait to see whats inside!

I think gasser's are more complicated. Mechanical diesels only need one wire to run. Gassers need fuel, compression, and spark to run. Diesel only needs fuel and compression. There are a lot more benefits to having a diesel in any vehicle. One day I need to convert my Jeep to diesel. But a Cummins swap would be ************ indeed. Would have plenty of power and will never need another engine ever again. Plus they are easy to work on. But that project would cost more than $4000. We're talking engine, trans, clutch pedal assembly, clutch master cylinder, mounts, adapters, 3 new driveshafts, whatever throttle actuator parts to make the pto generator work, and who knows how many hours of custom fab work. If I had a barn, 6-12 month time frame, and it wasn't my primary vehicle, I'd love to tackle that project.

And yes, I'm on Steelsoldiers. That's where I get all my information about what to do when a stock CUCV engine blows up. If you have a military vehicle and aren't on Steelsoldiers, well then the only person that your hurting is yourself.

 

[emtmark]

SS is awesome


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[PlethoraOfGuns]

SS is awesome


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Yea, I don't know what I would do without all the TM's. Those are an amazing resource, especially with all the crazy 24v stuff!

 

[PlethoraOfGuns]

Rolled the engine over on the engine stand and popped the oil pan off. Yea, kinda what I assumed, but still in denial...
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Yep, crankshaft broke in two. I guess it didn't like doing the last 20k miles between 4000-5000 rpms...
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What I didn't expect was the block cracking right above the bearing journals. Oh well, this engine is done. I would try to fix it, but I'm all out of JB Weld.
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Here's a good shot of the one side of the crankshaft right where it snapped, just prior to removal.
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A sad old engine with many stories to tell...
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We did get bored and stripped the whole engine, which is now everywhere in the garage. On the right on the cart you can see the other side of the broken crankshaft.
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Stand by for new powerplant...

 

[PlethoraOfGuns]

Well, found a HMMWV engine laying around that the U.S. government didn't want anymore. Should bolt in with little trouble.
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There she is, a 2007 GEP 6.5L 6500 Optimizer out of a military HMMWV. No, it's not turbo, and won't be. This truck is gonna try to keep things simple. I'm sure it will perform just fine being naturally aspirated. Besides, the HMMWV turbo 6.5's have a center mount turbo, and that would really complicate things.
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Best part about throwing this engine in is that it's exempt from the governments own regulations! :wings:

 

[k9lestat]

Lol

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[emtmark]

Sweet find! Those are supposed to solve some of the block cooling channel problems


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