- – Stuffing box leakages (not air tight).
- – Blow-by through a cracked piston crown or piston rod (With direct connection to crankcase via the cooling oil outlet pipe).
- – An oil mist could also develop as a result of heat from a scavenge fire being transmitted down the piston rod or via the stuffing box. Hot air jets or flames could also have passed through the stuffing box into the Crankcase.