Very interesting engine problem

[Anonymous Poster]

While using a post hole digger attachment on my b7200, I noticed a spray of oil coming from the vent tube on the head of my engine right next to where the oil fill cap is located. I stopped the tractor, let it cool down then drove to the barn with no further problems. The oil was coming out of the tube at a pretty good rate, so naturally I'm very concerned. Any good diesel mechanics out there have any idea what caused this or how I can fix it? Any help would be appreciated.

van

 

[RPM]

I can't claim to be a much of anything mechanic - just a tinkerer - but maybe a response will get the discussion going.

1. A dumb question - are the engine's oil levels and consumption normal?

2. Can you reproduce this by running the engine at maximum revs without any load on the PTO?

3. Any particular change in engine noise when this happens?

4. Any change in exhaust when it happens?

5. How many hours on the engine?

6. Does the engine idle hard?

7. Does the engine start hard from cold?

Without knowing any of these answers (or being familiar with the 7200), my guess would be a cracked head (maybe) or worn valve assembly (seats/stems/timing - more likely) allowing some combustion gases up under the rocker cover and blowing the oil out.

Could be wrong of course ... compression test should help localize the problem.

Patrick

 

[JRP]

I would look more for bad rings and blow-by. A leaking valve will leak into the intake or exhaust manifold. A leaking valve stem leaks exhaust gas into the crankcase (exhaust valve) , or crankcase vapors into the cylinder (intake valve). There is much more pressure in a cylinder under compression and during the power stroke, especially with a diesel.

A compression test should show if the cylinders have abouit equal pressure. I think you want them within 15%. If you have one low cylinder you can squirt some oil in the cylinder and try again. No incr5ease in pressure indicates valve problems. Increased pressure results from improved sealing caused by the oil.

If you have sticking rings there may be a combustion chamber cleaner you can squirt into the cylinder to disolve the sludge.

Find a good mechanic. Hope this helps.

jrpoux

 

[Anonymous Poster]

I pulled the dip stick on my M6800 while running and oil spray came out. Some might be normal. Do you have any baffle on this tube? Could something be plugged or a beffle came apart?

You might try looking at the tube for blockage or something.

 

[Anonymous Poster]

Thanks all for your input. I beleive the problem was simply too much oil in the crankcase. This seems silly, but I had just changed the oil not to long ago and filled it with the recommended amount per the owners manual. I now believe that there is a typo in the manual because it only holds about 2.5 quarts not 3.3 as the manual says.

Van