This engine is on a Rex pulvimixer. Have no history on engine or machine, fresh from auction. When put under heavy load engine loses oil out the exhaust. Besides that engine runs like a top. This is first old Detroit I've been around. Is there anything I should be looking for? I was gonna pull air filter and run it. And found out it has the oil bath filter set up. Can these get clogged up? Was also gonna pull intake piping and check for rats nests. Anything on the blower I should look for? Any advice would be appreciated. Thanks Tony
Yair . . . 5.9rookie Not sure of your meaning "loses oil out the exhaust" With any engine that has been sitting around it would always pay to check for rat nests, mud wasp nests and other crap that may have gotten into the intake. Oil bath air cleaners can definitely clog up and I have seen the bottom bowls over full where rain water has got in. There are folks on here who are much more conversant with these old dears than me and I am sure they will chime in. Every chance there is not too much wrong and the exhaust would clean up under load. HOWEVER I would check every thing mentioned and also crack the air box drains and make sure the shut off flap works as Detroits can have the rack stick or pick up that air cleaner oil and run away. Obviously the fuel system is free and working if you have got the thing to run. Cheers.
And I've said this before and I'll say it again, these engines are from a different era and they are VERY picky about the motor oil, and there are only a few (dwindling) choices out there. First, they do not like multigrade 15W/40, it will destroy them. Sadly, most folks nowdays don't know this, and the fact that 15W/40 is so prevalent it gets poured into green leakers. These engines require straight SAE 40 motor oil with a sulfated ash content of 1.0 % or less, less is better. Only a few oils available today meet that spec, Chevron Delo 100 (Delo 400 won't work), Texaco Ursa, Mobil Delvac 1240 just to name a few. Not saying this will fix your problem, could be the damage has already been done, just saying once you get it sorted out you should obtain the correct oil to give good service.
Also check for blocked blowby tube, and the air box drains gotta be open... so the oil pukes out on the ground instead of going through the engine, lol.
Seen one of those little suckers in an old galion crane a few years back and it was doing the same thing and iirc the rings were toasted out and the skirt was missing a few small pieces..
Yep, that's what multi-grade oil does to those engine.
What Willie said is fact. Pour multi weight oil in a two stroke that's had nothing but straight weight and it will go to slobbering oil. Witnessed that with two inline 6-71's, stationary units. Ran them too long, even changed back to correct oil they ate it like it was going out of style. No pun intended. Truck Shop
Is it using crankcase oil or wet stacking meaning oil from partial combustion is dripping down the outside of the stack. Everything said above is true and great steps but remember that Detroits are called screaming demons for a reason. They are made to be run against the governer. Don't try to use it at midrange lugging or set and idle a lot. When using set the throttle open and let it scream. If it is a 4-71(valve cover knobs thru the top of the valve cover) it should run at 1800 RPM. If its a 4-53 ( valve cover screws around the edge of the valve cover) it should run at 2400+/-. EDIT: It is not unusual for the rings to be sticky in these engines if they have been setting. Many times a few days running the crap out of them will clean them up. Check the other stuff first though.
The oil bath had to much oil in it. Drained it off till inch in bottom. Seems to have cured the problem. I didn't know not to use 15w40 in engine. I've got an old parts machine that used regular air filters. I may put it on the running machine and do away with oil bath. Many thanks men, y'all helped a lot
Should probably drain all the oil bath oil and clean the pan and refill with clean oil. Hard to beat the oil bath filters. They worked good.
Make sure you have the correct dip-stick. Full should be 1 inch below the pan/block line.