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Has the mower been tipped up? if so sump oil can travel through the breather and into the air filter soaking it in oil which then in turn burns and smokes, remove the air filter and see if is soaked in oil.
There are other reasons, engine over filled with oil, engine breather blocked, engine worn.
the breather hose is the means of allowing the compression by pass gasses to not build up pressure in the sump and it exits into the air inlet system near the air cleaner
for oil to be dripping there indicates
1--excessive oil in the sump
2-- worn rings allowing excessive blow by and boiling the sump oil
3-- incorrect oil used in the sump ( too thin) try a 30w -50 grade
check sump oil level--excessive oil level will cause this
have a compression test done on the engine (both wet and dry) to determine engine condition---excessive blow by from worn rings , bore or cracked piston will cause this --- clean/ replace air filter as if there is a low pressure area after the filter , it helps suck oil vapor from the sump
It could be worn rings ( especially if it is an older t120 60's-70's ) that is allowing compression into the crankcase and blowing the oil out the breather.
you need to clean out the sump air vent. and change the filter for the air breather. some are fitted with a clean easy filter you take off and wash out.
As the piston moves down towards the sump, air is vented through a baffle arrangement called the breather.Sometimes a tube connects the breather to the carburettor so that droplets of oil are fumes are sucked back into the engine to be burnt. If you turn a mower on its side and the breather is on the lower side, oil can run out of the breather and possibly into the carburettor. The carburettor is probably flooded and contaminated with oil. This should eventually dissipate as gas dilutes the oil, but try removing the filter and checkout whether a lot of oil has accumulated. Another scenario is that the air filter has become saturated with oil. If the filter is a foam type, the excess oil can be squeezed out. However if a paper filter is fitted, the likelihood is that it will have been destroyed and need to be replaced.
indicates excessive oil in the sump ( check float is not stuck and fuel in leaking into the inlet manifold and into the engine sump)
ring problem allowing excessive blow by into the sump which is collecting oil vapor as it exits to the air filter
Deep sumps are to keep the pickup in the oil at all times even when the front end is way off the ground - I don't think it'll have any effect on sending oil out the crankcase breather. An aftermarket tail-mounted breather box will keep oil out of the airbox but it's expensive probably hard to find nowadays, and forces you to reroute a lot of wiring as well as relocate your computer box. Simpler to just do fewer and smaller wheelies,,,
Deep sumps are to keep the pickup in the oil at all times even when the front end is way off the ground - I don't think it'll have any effect on sending oil out the crankcase breather. An aftermarket tail-mounted breather box will keep oil out of the airbox but it's expensive probably hard to find nowadays, and forces you to reroute a lot of wiring as well as relocate your computer box. Simpler to just do fewer and smaller wheelies,,,
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