Improper fuel-to-oil ratio: If too much fuel is mixed into the oil during a recent oil change, it can lead to a petrol smell in the engine oil. This can happen if the fuel valve is not properly closed or if the carburetor float is damaged, causing excess fuel to enter the engine.
Leaking carburetor: A faulty or leaking carburetor can allow fuel to drip into the engine, which can find its way into the engine oil. This is especially common when the engine is not in use, as the fuel can gradually leak into the oil reservoir.
Damaged piston rings or cylinder walls: Worn or damaged piston rings or cylinder walls can allow fuel to seep past the rings into the engine oil. This can cause the oil to become contaminated with fuel, leading to a petrol smell.
Blown head gasket: If the head gasket between the engine block and cylinder head is damaged or blown, it can allow fuel to enter the oil channels, resulting in a petrol smell in the engine oil. This is a more severe issue that requires immediate repair.
Fuel injector issues: In lawnmowers with fuel injection systems, faulty or clogged fuel injectors can cause excessive fuel to be injected into the engine, some of which may find its way into the engine oil.
If you notice a strong petrol smell in your lawn mower engine oil, it's important to investigate the cause and address the issue promptly. Check the oil level and consistency, look for signs of leaks, and consider consulting with a qualified mechanic if the problem persists or if you're unsure of the source of the smell.
