Worn piston rings can't seal the combustion chamber effectively, allowing excessive oil to leak into the chamber and burn along with the fuel. Blue smoke is the result. Replace worn piston rings to stop the smoking issue.
2. Damaged Oil Scraper Ring:
The oil scraper ring is responsible for removing excess oil from the cylinder walls and returning it to the crankcase. If this ring is damaged or worn, too much oil can remain on the cylinder walls and get burned during combustion, leading to blue smoke. Replace the damaged oil scraper ring to resolve this issue.
3. Worn Valve Stem Seals:
Valve stem seals keep oil from seeping into the combustion chamber when the valves are closed. If these seals become brittle or worn, oil can leak into the chamber and burn, resulting in blue smoke. Replace worn valve stem seals to stop the smoking issue.
4. Excessive Crankcase Pressure:
Excessive crankcase pressure can force oil past piston rings and into the combustion chamber. This can be caused by a clogged air filter, a faulty PCV valve, or worn piston rings. Address the root cause of the excessive crankcase pressure to stop the blue smoke.
5. Oil Overflow:
If your lawnmower has too much oil in the crankcase, it can cause excessive oil to be drawn into the combustion chamber. This can result in blue smoke. Check the oil level and drain any excess oil to resolve the issue.
Remember that blue smoke is usually a sign of an underlying problem with the engine. It's important to identify and address the root cause of the smoke, rather than simply adding oil to the lawnmower. If the issue persists or you're unsure how to proceed, it's best to consult a qualified mechanic or contact Briggs and Stratton customer support for assistance.
