I newly overfilled a 4 hit lawnmower engine through oil. It has been operation for around 1.5 hrs while overfilled. It smokes a lot ideal after being started yet after 30 secs or therefore the acting clears. Now that ns have determined what i did I setup to drainpipe the oil under to the "high" mark and also keep running it. What type of damage can I have done?


many thanks for every the input together it describes what occurred to my ~5 year old 17.5 hp Craftsman talk lawnmower. My son was mowing the grass when it threw the crank through the instance out that nowhere. He later on asked if pour it until it is full the oil too much would execute this. Didn't think that it would certainly as I have actually done it before on enlarge Craftsman with just smoke as the result. Looks like this is a newer design engine and must have actually bent the crank and possibly shed lubrication enough to ruin the motor. An excellent thing i bought a 1 year old Troybilt Pony with the same engine because that $300 native a friend because it didn't cut an extremely
good. Have the right to put the engine top top the Craftsman, & usage the Troybilt structure for parts, because that a totality lot less money 보다 buying or rebuilding the Craftsman motor. Sometimes you win. Again, thanks for everyone taking the time to share her knowledge and also experience!
Over pour it until it is full an engine with oil can cause it also "foam" the oil, i beg your pardon reduces it"s lubrication properties. If you reduced the level come proper quantities you might have added some wear, however it"s unlikely that you resulted in serious damage.

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A couple of things have the right to happen:

The crankshaft can be bentThe seals and gaskets could be destroyedVery high crankcase pressure have the right to lead to oil coming the end of the crankcase ventilation (which can destroy your pistons if that enters her cylinders with your intake system)

Eric Fossum"s remark about turning the oil come foam is a very important one. It leader to decreased lubrication inside the engine which can lead to terminal engine failure.



If the oil level is also high it have the right to actually bending the crankshaft. If the crankshaft is striking the oil once the engine is to run it can destroy the engine. That doesn"t sound favor you have actually done any type of permanent damages with what you have actually described.


Long story to include a fairly short answer, however it"s nice amusing, for this reason I"ll offer the whole story. :-)

My Dad as soon as WAAAAY overfilled our cheap-o mower (Briggs & Stratton engine on it) as result of filling the entire oil compartment when all you"re supposed to do is wet the sponge in it. This arisen after us realized it had actually no oil in it, which we finally established after a Summer of having actually it battered working and also be seized increase every 20 minutes (from overheating apparently, you couldn"t budge the cord until it cooled off, climate it would certainly run fine again).

The effect of the overfill was to punch oil, both in liquid and smoke form, v the muffler like crazy for numerous minutes. Pretty lot fogged in our entirety street prior to it cleared up.

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As a last note, we (several years later) retired the mower through parking it out ago and just leaving it there. The new fancy mower tossed a rod a month after ~ the 3 year warranty to be up, for this reason we got the ol" beat increase mower from wherein it had been abandoned. Began on the 3rd pull (with the exact same gas, oil, and also plug that were in it as soon as we left it to sit in the elements)... Supposedly Briggs & Stratton do a seriously challenging engine...