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Cat d4 7u spits oil out of exhaust at operating temperature.

M

Mr.Ferguson

Member
My ?47 Cat D4 ?Old Smokey? will spit oil out of the exhaust at operating temp. Can anyone give a quick speculative diagnosis? Any answer is a good answer, unless it isn?t.


Mr.Ferguson
 
(quoted from post at 21:33:22 03/30/19) My ?47 Cat D4 ?Old Smokey? will spit oil out of the exhaust at operating temp. Can anyone give a quick speculative diagnosis? Any answer is a good answer, unless it isn?t.


Mr.Ferguson
Click to expand...

Go join the ACMOC site.

I have a D4, 47, serial number 18 and yea the numbers match.

I would guess that your oil control rings are either stuck or bad.

Rick
 
If it does it when idling, or not working very hard like driving around. The engine temp has dropped off from full operating temp just a bit. Our D-4 4G8 Dad told about pulling the beaner in the field. Would go to pushing oil out the exhaust, so would shift up a gear and idle back just a bit, and it would quit as it worked a bit harder then. Our No.6 traxcavator 10A1 (D-6 with a loader on) would do that if it idled for a long period. Once it went to work it stopped.
If it sort of stays in place and not filmy like then it could be just fuel. That usually happens if it idles in cold weather more where it has trouble with keeping the engine temperature up enough to burn all the fuel completely. Semi trucks used to have trouble with the fuel problem, if let to idle at low idle speed during the night. If engine speed was picked up to about 1000rpm it solved that problem in them.
 
If the "oil" land on the hood and dries out to a grey oval that can be wiped off (and is not oily when wiped) it may be "wet stacking" Water is produced when a hydrocarbon is burned (About one gallon of new water for every 5 gallons of fuel) this water can condense in the exhaust system if it is cool, and disolve some soot with it and deposit the soot on the surrounding area. If that is it. Running it harder will help, or put a tip on the exhaust pipe to have it rain off to one side. Jim
 
verify that it is running hot enough, then work it hard for a day . The old timers used to sprinkle bon-ami in the air intake to scour the cylinder walls a little to get the rings to set better
 



Yup, that Bon Ami was recommended in the Cat manual! Couldn't believe it till I read it. But that was for new rings, not worn rings.
 
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