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