A large change in ambient temperature, or using an oil of a viscosity different than the one recommended by the manufacturer in a mechanical hydraulic governor, will result in the need to adjust the __________.

Heavy Fuel Oil (HFO) must be preheated to achieve proper atomization viscosity (10-15 cSt) at the fuel injectors. Improper viscosity causes poor spray atomization, delayed ignition, and combustion chamber fouling.