i have a small excavator with a new cummins. it came with break in oil to the full mark. i run it about 25 hours, checking the fluids twice a day.

had other stuff to do for a week, left the machine on the job. go to check the oil and its about 2 quarts over full. i operate the machine and it starts to over heat after 2 hours.

anyone hot any ideas.

 

Does the oil have a diesel smell to it? Sounds like a bunch of diesel dripped down and diluted the oil.
Let us know what you find?
Suggest that before operating that engine any more that you change the oil? Or if the new engine has some sort of warranty, contact the people who supplied the warranty.

 

i smelled the oil , doesnt smell like deisel. cant figure out why its over full. the oil is really black. it has break in oil in it. i would think it would be cleaner with only 25 hours on the new motor.

im wondering is someone did something to the machine. the oil doesnt feel gritty. but maybe there is something else added.

i dont know how to screw up an engine, so its hard for me to figure it out.

 

diesel oil gets black fast, but is odd to have extra oil.
are you checking it on level ground?

 

Drain the oil and take a sample. See what a lab says about fuel content, metal wear, etc. Sounds like you have a leaky injector. Double check the cooling system too. What kind of excavator is it?

 

Are there any hydraulic pumps run off the engine? Maybe a bad seal in one and hyd. fluid is entering the crank case. Had that issue myself on an old international 300U.

 

the excavator is a komatsu pc 75. there are 2 pumps hooked to the motor. 1 is the main pump, the other is a small pump that is gear driven in the area of the timing chain. the rear main seal is new and would keep oil coming in from the wet flywheel housing and the main pump. the small pump i suppose would have an internal seal. i will take samples of the oil and have it tested. when i installed the new motor, it came with all new fuel injection system, filters, pump, everything.

 

The overheat problem I think is key to this problem. You could have a problem with a head gasket or an oil cooler now allowing coolent into the oil.

What caused the machine to overheat? Was someone else running the machine after you had run it seemingly without problems?

The first thing I would do is drain the oil, and have an analysis done. Also have an analysis done on the coolant. And finally have a leakdown test done from the radiator cap. Don't forget to have the t-stat removed for the test. You might find a problem with the t-stat, come to think of it.

Good luck in finding a remedy to the problem...

 

Do you know who ran the equipment while you were gone? You may ask them if they checked the oil and added any.

You should wait a little while before checking the oil. It will read a little lower if you don't wait for most of the oil to drain back to the pan, I think the owners manual for the Ram says to wait 15 minutes.

Ok, now suppose while you were gone someone didn't wait long enough. They just checked the oil, saw it was low on the dipstick and decided to add more.

Just a thought! Hope its something simple like that. If it is, this would be something some education and perhaps a sign or sticker could fix.

There's nothing in this world we can't fix with more signage!

Perhaps they can be told to check before firing the engine in the morning and then again just before firing the engine after eating dinner or going to break.