Cummins 855 questions

[Truck Shop]

Truck shop, they are telling me the issue is fuel in the engine oil. Injection pump seal? Can you give me some direction on this? TIA

Fuel pump main shaft seals, injector cups, injector 0-rings, cracked cylinder head, injector it self.
Those are the main issues and the normal issues. Although on a old engine like that it could be
a combination. Age. Best I can tell you from memory and my memory in some cases ain't too
good.

 

[Mike L]

Thanks. Sounds like I need to do some disassembly and send some stuff to injection and machine shops.

 

[Truck Shop]

Thanks. Sounds like I need to do some disassembly and send some stuff to injection and machine shops.

Because your in Texas you might try Premco for pump/injector repair, that's where most
send their 855 stuff.

 

[Tenwheeler]

Thanks. Sounds like I need to do some disassembly and send some stuff to injection and machine shops.

Maybe put dye in a 5 gallon can to pull from and return fuel to. Run and look for dye around injectors.

 

[DMiller]

Generally Pump Shaft seal leak runs out weephole, first choice would be Orings.

 

[Mike L]

Well I got to see the engine today. I had some dye with me and planned on going that route until we got talking and he mentioned that they needed to add coolant every time they ran it. Hmm. Topped off the water and pressure tested the cooling system. Wouldn’t hold pressure and we could hear a hissing noise. This particular application has a cooled exhaust manifold. Loosen up the bolts and water ran out of the manifold. Removed it, capped off the holes, filled it with water and put the air to it. Quickly found a crack. They had a parts book and we found a number. Googled it and found a place in Alabama that built them for $3200. then they showed me the old engine oil. Chocolate milkshake.

 

[Truck Shop]

Too much money to repair, very obsolete, repower it.

 

[DMiller]

AGREE!!

 

[Mike L]

Sorry to disappoint you but we’re fixing it. it only runs 30 minutes a week and they don’t want to spend the money to repower.

 

[Truck Shop]

You ain't disappointing me, I'm not the one that has to stand behind it.

 

[terex herder]

My engine has a wet exhaust manifold

 

[Birken Vogt]

If it is a legally required fire pump it may not be possible to repower it without getting it re-engineered which is not going to happen. So rebuild or total replacement are the only option and total replacement requires re-engineering anyway and the lead time can be years to get one built and installed.

 

[DMiller]

Had that issue at the Nuke, Fire Pumps, Backup Emergency Building Generators, had one 12V92(Siamese 6Vs, three SC Cummins two on fire one genny, and one KT series on a genny.

 

[Truck Shop]

Which is nuts,-may as well let it burn.

 

[Mike L]

My engine has a wet exhaust manifold

Somehow I feel that I will own that engine someday. And you’re a bit closer to me these days

 

[chidog]

I'm lost on this one. Thread started in Jan 22, is this engine running yet? I thought it was needed for a fire system ? Went through this pretty fast and likely missed something.

Old OMC outboards? Never had problems with them but then I liked working on them, as a youngster.

 

[Birken Vogt]

I'm lost on this one. Thread started in Jan 22, is this engine running yet?

This post https://www.heavyequipmentforums.com/threads/cummins-855-questions.92759/post-1141510

He found another one to work on

 

[Mike L]

I can’t get enough of them!

 

[DMiller]

Used to be that way, found Cat.

 

[chidog]

Cat is nothing special, they got their share of problems.