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outsourced
07-02-2007, 11:43 PM
Scag Turf Tiger 61 deck with a 27 hp liquid cooled kawasaki engine with 1600 hrs is burning burning oil at a rate of about a half qt for every 8 hrs of operation. We do alot of large commercial properties and run these machines pretty hard. This one gets about 30 hrs runtime a week. I change the oil and filter every sunday and always use Penzoil SA 30. It spits black smoke when starting and when blades engage, but then exhaust runs clean. Dealership says run it till it blows and nothing can be done about it. Any suggestions for additives or oil that may increase the life of this engine?

Thanks in advance.

johnp900
07-04-2007, 08:49 AM
Not much to do for that engine. It probably has the older round style of air filter. Kawasaki had problems with some of those filters. If it is a white filter, get rid of it & at least put in the new updated pink filter part # 11013-2213. Clean all the dirt out of the carburetor intake & check for a worn throttle shaft. That's probably is what is causing the black smoke.You may need to replace it to get the engine to run decent. If & when you replace the engine, get the newest "donaldson" style air filter on it. Your dealer will know which one to order.

Eric D
07-04-2007, 12:18 PM
Outsourced,

Keep in mind there are only certain places that oil can come from to get burnt during the combustion process. The two major places are past the piston rings, and past the valve stems. A differential compression test will indicate the most likely path.

As far as suggestions, a simple check would be to make sure the crankcase vent is clean and clear. If it is blocked the crankcase can pressurize causing any oil near the valve stems and around the piston rings to be forced into the combustion chamber, making it use oil at a higher then normal rate. Your engine might just be worn to the point that oil burning will be normal. You could also go to higher viscosity oil. The down side to doing this would be harder starts in cool weather and a slight increase in fuel consumption (higher friction). Try a straight 40 or 50 weight. If you have a hard time locating these weights of oil, any local airport will have oil for aircraft engines. Look for Aeroshell 80 or 100. The 80 is the same as straight SAE 40w and the 100 is the same as straight SAE 50w oil.

Best of luck,

Eric D