Normal Operation
Warning: Do not operate the engine in an area where flammable vapors such as gasoline or diesel fumes are present. Shut off the engine when in an area where flammable liquids or gases are being handled. Failure to observe these precautions could result in serious injury or death.
Engines produce high horsepower and peak torque characteristics at low rpm. Because of this, it is not necessary to operate the engine at high rpm to deliver the required horsepower at the wheels. These characteristics may also result in less shifting and make shifting at lower rpm (to peak torque) more practical.
Depending on the vehicle gearing, the posted speed limit can sometimes allow operation in either of the top two gears. However, for improved operating efficiency (fuel economy and engine life), operate in the top gear at reduced rpm, rather than in the next lower gear at the maximum rpm. Cruise at partial throttle whenever road conditions and speed requirements permit. This driving technique permits operating within the most economical power range of the engine.
When approaching a hill, accelerate smoothly to start the upgrade at full power (2000 rpm or higher is recommended), then shift down as desired to maintain the optimum vehicle speed.
Engines are designed to operate over a wide speed range. More frequent shifting than necessary does not allow proper utilization of this flexibility. The driver who stays in top gear and uses the wider speed range will achieve the best fuel economy.
Notice: Do not allow the engine to exceed its governed speed, or serious engine damage could result.
The engine is effective as a brake on downhill grades, but take care not to overspeed the engine going downhill. Use a combination of brakes and gears to keep the vehicle under control at all times and to keep the engine speed below the rated governed rpm.