the model number is 917.388220 it's a craftsman mulcher … I'm quite confident the gasket is not leaking. 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 … Some of those causes are simple to remedy while others are more serious problems that require complicated repairs. It appears that the oil is coming down the blade shaft. Eventual motor failure will occur if the oil level in the mower's crankcase falls too low. Could this be the seal to the shaft? I have a 15-year old Craftsman mower that sometime over the winter started to leak oil. What would cause oil leaking from around the shaft under the motor? When the oil level is too full it causes excessive back pressure inside the engine. A leak in the oil supply--anywhere on the machine--requires prompt addressing. Very common problem when you hit a rock or stump, etc. By far, the most common cause of lawn mower engine oil leaks is an overfull engine oil level. How hard is it to repair at home? 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. There is no external orifice on the oil breather, so the oil is not coming from there. You'll need to make a thorough inspection of the oil system on your Briggs & Stratton lawnmower. 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 have an MTD 12.5 riding mower that is leaking oil from under the engine. If you're using a push mower, you most likely have bent your crankshaft which will cause oil to leak from the main seal on the bottom of your engine. I have a craftsman lawn mower that is leaking oil . Oil leaking through a lawnmower's air filter has several possible causes. 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 … Oil is collecting on top of the pulleys. Report This by Manage My Life. 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. The oil comes out around the bottom of the cylinder, but not at the head … Holly Holly September 2005 Once the engine was hot, it started dripping oil on the mower deck, right at the same place below the oil breather. what causes the oil to leak from the opening where the oil stack fits in at the bottom as the engine spins? … I am assuming that there is bearing and a gasket where the shaft comes out of the motor. This is most likely not worth fixing unless you have an expensive, high quality mower. 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