How hard is it to repair at home? Some of those causes are simple to remedy while others are more serious problems that require complicated repairs. 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 a 15-year old Craftsman mower that sometime over the winter started to leak oil. 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 . 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 … what causes the oil to leak from the opening where the oil stack fits in at the bottom as the engine spins? Eventual motor failure will occur if the oil level in the mower's crankcase falls too low. Very common problem when you hit a rock or stump, etc. It appears that the oil is coming down the blade shaft. I have an MTD 12.5 riding mower that is leaking oil from under the engine. There is no external orifice on the oil breather, so the oil is not coming from there. When the oil level is too full it causes excessive back pressure inside the engine. By far, the most common cause of lawn mower engine oil leaks is an overfull engine oil level. Oil leaking through a lawnmower's air filter has several possible causes. I'm quite confident the gasket is not leaking. ... 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. I am assuming that there is bearing and a gasket where the shaft comes out of the motor. June 20th, 2010. there is a long neck where the oil dipstick goes. Holly Holly September 2005 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. You'll need to make a thorough inspection of the oil system on your Briggs & Stratton lawnmower. the model number is 917.388220 it's a craftsman mulcher … Could this be the seal to the shaft? Oil is collecting on top of the pulleys. Once the engine was hot, it started dripping oil on the mower deck, right at the same place below the oil breather. 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 … 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. A leak in the oil supply--anywhere on the machine--requires prompt addressing. … Report This by Manage My Life. What would cause oil leaking from around the shaft under the motor? 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