Engines authorized Detroit Diesel engine dealer for informa- tion regarding availability of special cold-weather equipment. The exhaust pipe gives off heavy smoke. The coolant and/or oil temperature climb abnor- mally. High Altitude Operation Abnormal sounds suddenly occur in the engine or turbocharger. Engines lose horsepower when operated at high alti- tude because the air is too thin to burn as much fuel as at sea level. This loss is about three percent for each 1000 feet (300 m) altitude above sea level for a natu- rally aspirated engine. Most turbocharged engines are rated for higher altitudes than naturally aspirated en- gines. 1.
With the vehicle stopped, apply the parking brakes and place the transmission in neutral. CAUTION After hard operation, shutting down the engine without idling may cause damage to the turbo- charger. An engine will have smoky exhaust at high altitudes unless a lower gear is used. The engine will not de- mand full fuel from the fuel system unless the engine is altitude-compensated by the use of a turbocharger. Shift gears as needed to avoid excessive exhaust smoke. 2. Allow the engine to idle one to two minutes before shutting it down. This allows the lubricating oil and the coolant to carry heat away from the combustion chambers, bearings, shafts, and seals.
The extreme heat may cause bearings to seize or oil seals to leak. IMPORTANT: Bearings and seals in the turbo- charger are subjected to the high heat of combus- tion exhaust gases. While the engine is running, this heat is carried away by oil circulation, but if the engine is stopped suddenly, the turbocharger temperature may rise as much as 115°F (46°C). Engine Shutdown Mercedes-Benz If any of the following occur, shut down the engine im- mediately. The oil pressure swings back and forth or falls sharply. Engine power and rpm fall even though the ac- celerator pedal remains steady. 4.24