Operating the Engine

AVOID OVERHEATING THE ENGINE
The temperature of the coolant (a mixture of 50% ethylene-glycol and 50% water) must not exceed 110°C [230°F] with a 103 kPa [15 psi] radiator cap.

AVOID LOW COOLANT TEMPERATURE OPERATION
Continual operation at low coolant temperature below 60°C [140°F] can be harmful to the engine. Low coolant temperature can cause incomplete combustion which allows carbon and varnish to form on piston rings and injector nozzles. Also, the unburned fuel can enter the crankcase, diluting the lubricating oil and causing rapid wear to the engine.

Do not operate the engine with low oil pressure

When the engine is at normal operating temperature, the minimum oil pressures required are:

^ Idle 700 to 800 RPM - 69 kPa [10 PSI]
^ Full speed and load - 207 kPa [30 PSI]

DO NOT OPERATE THE ENGINE WITH FAILED PARTS
Practically all failures give some warning before the parts fail. Be on the alert for changes in performance, sounds and visual evidence that the engine requires service. Some important clues are:

^ Engine misfiring or vibrating severely.
^ Sudden loss of power.
^ Unusual engine noises.
^ Fuel, oil or coolant leaks.
^ Sudden change in the engine operating temperature.
^ Excessive smoke.
^ Oil pressure drop.
^ Etc.

PREVENT OVER-SPEEDING THE ENGINE GOING DOWN HILL
When descending steep grades, use a combination of gears and service brakes to control vehicle/engine speed. Over speed can cause severe engine damage.