A leak in the oil supply--anywhere on the machine--requires prompt addressing. The oil comes out around the bottom of the cylinder, but not at the head … what causes the oil to leak from the opening where the oil stack fits in at the bottom as the engine spins? 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 … I'm quite confident the gasket is not leaking. I have a 15-year old Craftsman mower that sometime over the winter started to leak oil. I am assuming that there is bearing and a gasket where the shaft comes out of the motor. 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. 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. What would cause oil leaking from around the shaft under the motor? Eventual motor failure will occur if the oil level in the mower's crankcase falls too low. 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. … 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. June 20th, 2010. there is a long neck where the oil dipstick goes. the model number is 917.388220 it's a craftsman mulcher … It appears that the oil is coming down the blade shaft. I have a craftsman lawn mower that is leaking oil . Holly Holly September 2005 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. There is no external orifice on the oil breather, so the oil is not coming from there. ... 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. Once the engine was hot, it started dripping oil on the mower deck, right at the same place below the oil breather. This is most likely not worth fixing unless you have an expensive, high quality mower. How hard is it to repair at home? Could this be the seal to the shaft? Oil is collecting on top of the pulleys. 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. Report This by Manage My Life. 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