Owners manual

QSB4.5 and QSB6.7 Operating the Engine
Section 1 - Operating Instructions Page 1-13
Most failures give an early warning. Look and listen for
changes in performance, sound, or engine appearance
that can indicate service or engine repair is needed. Some
changes to look for are:
• Engine misfires
• Vibration
• Unusual engine noises
• Sudden changes in engine operating temperatures or
pressures
• Excessive smoke
• Loss of power
• An increase in oil consumption
• An increase in fuel consumption
• Fuel, oil, or coolant leaks.
Cold Weather
It is possible to operate engines in extremely cold environments if they are properly prepared and maintained.
Satisfactory performance of an engine in low ambient temperature conditions requires modification of the engine,
surrounding equipment, operating practices and maintenance procedures.
The correct engine coolant lubricating oil and fuels must be used for the cold weather range in which the engine is
being operated. Below are the recommendations for these critical engine fluids: