Report This by Manage My Life. Holly Holly September 2005 By far, the most common cause of lawn mower engine oil leaks is an overfull engine oil level. Very common problem when you hit a rock or stump, etc. what causes the oil to leak from the opening where the oil stack fits in at the bottom as the engine spins? The pressure forces the engine oil to escape from areas such as: the dipstick seal, lower crankshaft seal, o il pan gasket and can cause the head gasket to blow … If the mower inclines towards a particular side when moving on a sloppy area, there is a likelihood of oil leaking onto the muffler, causing the engine to smoke. the model number is 917.388220 it's a craftsman mulcher … I have a CraftsmanNNN-NN-NNNNpush lawn mower with a ModelNNN-NN-NNNNEager 1 (Techumseh) engine that has a leaking oil seal (bottom seal -- leaking down the shaft onto the … There is a seal at the bottom of the engine and the top is sealed by a tight fit between the crankshaft and the crankcase. Once the engine was hot, it started dripping oil on the mower deck, right at the same place below the oil breather. In such a case, turn off the mower’s engine and wait until it has cooled, to examine the oil chamber for leaks if any. It appears that the oil is coming down the blade shaft. When the oil level is too full it causes excessive back pressure inside the engine. I have a craftsman lawn mower that is leaking oil . If that cap is not properly replaced, or if the vibrations from the engine loosen it or make it fall off, you will quickly discover an oil leak out of this portion of the engine. I have an MTD 12.5 riding mower that is leaking oil from under the engine. What would cause oil leaking from around the shaft under the motor? June 20th, 2010. there is a long neck where the oil dipstick goes. ... March 18, 2020 March 18, 2020 lawn mower engine leaking oil, lawn mower engine leaks oil, lawn mower engine overfilled with oil, lawn mower engine smokes, oil leak on push mower. Oil is collecting on top of the pulleys. The oil comes out around the bottom of the cylinder, but not at the head … This is most likely not worth fixing unless you have an expensive, high quality mower. To change the oil in a John Deere mower you typically remove a drain plug from the bottom side of the engine so that the old oil can run out through the drain tube. I am assuming that there is bearing and a gasket where the shaft comes out of the motor. Could this be the seal to the shaft? Oil leaking through a lawnmower's air filter has several possible causes. Some of those causes are simple to remedy while others are more serious problems that require complicated repairs. There is no external orifice on the oil breather, so the oil is not coming from there. I have a 15-year old Craftsman mower that sometime over the winter started to leak oil. … A leak in the oil supply--anywhere on the machine--requires prompt addressing. 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