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Kohler Blowing Oil at Crankshaft

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Old 01-24-2011, 04:59:35 PM
gene w gene w is offline
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Default Kohler Blowing Oil at Crankshaft

engine blows oil at crank under flywheel.breather or seal problem?? engine is ohv w/ timeing belt thank you in advance
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Old 01-24-2011, 06:35:56 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: kohler blowing oil @ crankshaft

Bad seal, worn crank bearing, blocked breather, worn rings/cylinder, blocked cooling fins/blower housing inlet blocked, warped cylinder from overheating, piston/cylinder scored from foreighn objects injested, rings stuck/carboned up from engine running slow or light load - carb dirty, causing rich condition (carbon), oil dilution from gas getting into crankcase,...

There are tons of things that cause leaks! First is to check the crank bearing for wear. Try lifting, pushing down, and pulling side to side, with the engine disconnected from the load. try pulling in and out as well If the crank bearings are loose, the crank will wander, breaking the seal. Next is check the seal itself - it may be hardened. Next check the oil itself - right viscosity, gas dilution? Gas dilution will destroy the seal. After that, check condition of the crank case vent and hose. If blocked, it will pressurize the crankcase, thus blowing out the seal. Check the cylinder and piston, for warp and scoring. Defects will allow gasses to get into the crankcase. Check the cooling system. You can't count the times I have pulled mouse nests and debris out from under the cooling shroud! Make sure the cooling intake is un-impeded. A blocked intake can ruin your day!

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