1985 Cummins marine diesel Q 1

[GeorgeAskew]

Hi.
My name is George Askew- I am new to the forum, so forgive mistakes please.
I am trying to do research on an above engine Model NT855.[But when I search the Cummins site the computer tells me No such data etc
Ihave to go and look at this engine soon and heres the problem.
The story as I got it from the owner who "No spika da English" via an interpreter who "doesnt speak so good English"is this. He ran the engine and when they stopped he found water in the top of one of the cylinders and we wonder how it got there.
The water is lake water.
Any help appreciated.

George
Kalemie
Congo

 

[itsmoked]

Wow feeble info there...

Is it a wet stack system? If so you can always have some wave surge hit the back of the boat and make it into a cylinder.

Or a bad head gasket.

Diesel locomotives had such issues with head gaskets that for years the correct starting method for them all was to open all the cylinder port valves, and crank the motor. This would eject any accumulated water. Then close all the ports and proceed to start the engine.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[GeorgeAskew]

Hi Keith
Thanks for the reply.
No, it is neither, but having been to look at the engine and analysing it, it seems that water is coming from the water jacket at the bottom of the cylinder. I also noticed a few droplets of water below the cylinder in the crankcase. All indications are that the cylinder sleeve wall has a hairline crack.
We are taking it out today to see if this is the case.
If not ??

Regards

George Askew

 

[chief]

The important thing to remember with Cummins engines , is that they have a common rail fuel system. The fuel valves are activated by a camshaft and push rod set up. If you have a fuel valve problem, it is difficult to locate without inspecting all fuel valves. To prevent fuel leaking into the cylinder head, on an idle engine, it is neccessary to locate your fuel supply tank below the level of the cylinder heads.
An indication of cracked cylinder liners will be gas bubbles in your cooling water header tank.

Offshore Engineering&Design

 

[GeorgeAskew]

Thanks Chief. This really helps as we may be taking over this boat and giving it a re-vamp so this is a very useful piece of info.

I found the water ingress problem. I found a bad pit hole under the neoprene "scraper" seal that led to a pinhole on the inside.
Many thanks to all who responded.

Another Q. I am having trouble trying to find info on the Cummins website - which is not very user friendly.
I am trying to identify this 1985 engine and get an online manual, exploded views and a parts list. Any ideas how to get this?
Regards
George Askew