What does oil on lawn mower spark plug mean?
One potential source of oil on your spark plug is a blown piston seal. The seals keep oil from leaking into the combustion chamber and, if blown, can manifest themselves by spraying oil on the spark plug. This is not a user-serviceable part, as it requires an engine rebuild.
Moreover, why is my spark plug wet with oil?
Oil pooled in the spark plug well indicates a leaking component (e.g., tube seal) allowing oil to enter the well and contaminate the plug. The corresponding ignition coil (or spark plug wire) will also be wet.
Subsequently, can oil ruin spark plugs?
Oil making its way into the spark plug wells will drastically affect the engines performance, leading to misfires, increased oil consumption and blue exhaust. In extreme cases, it can even lead to an engine fire. If the vehicle is exhibiting any of these symptoms, the spark plugs should be inspected immediately.
What causes oil in cylinder?
The cylinder head on an engine gets very hot. The seals on the cam cover gasket and spark plug tubes can and do deteriorate and leak onto the cylinder head exterior. One other point to watch for is the hoses for the PCV valve. If they have gone 'soggy' or otherwise blocked they will leak oil onto the head.
- Burning oil smell. When a valve cover gasket is pinched, worn out or cracked, compressed oil from underneath the valve cover will find a way to escape. ...
- Valve cover is dirty and leaking oil. ...
- Engine is low on oil. ...
- Engine is running rough and causing misfires.