Engines If the temperature is low enough to require the heater, the amber INTAKE HEATER indicator stays on while the intake air preheater warms up. After the indicator goes out, start the engine. If the engine doesn’t start after about 30 seconds of cranking, turn the key to the off position and wait two minutes; then repeat the start- ing procedure. CAUTION Protect the turbocharger during the start-up by not opening the throttle or accelerating the engine above 1000 rpm until minimum engine idle oil pres- sure of 12 psi (83 kPa) registers on the gauge. 5. Idle the engine for about five minutes at 1000 rpm before operating the engine under load. NOTE:
If the engine doesn’t start on the second try, wait at least five minutes before using the in- take air preheater again. Cold Weather Starting WARNING Caterpillar Caterpillar truck engines with direct injection are de- signed to start at temperatures above 32°F (0°C) with- out using start systems. If the temperature is below 32°F (0°C), startability will be improved by the use of an automatic ether injection system and/or a jacket water heater. Do not use any starting aid, such as ether, in en- gines with an intake air preheater. This could cause an explosion and serious personal injury or death. Modern electronic engines do not normally require spe- cial starting aids.
At low temperatures, intake air pre- heaters, manifold preheaters, or water jacket heaters are sometimes used to assist in starting. CAUTION Mercedes-Benz Directing ether at the heater element in the intake air preheater could cause extensive engine damage. The intake air preheater is activated by turning the igni- tion switch to the on position ( Fig. 4.1 ). If the engine is at normal temperature, the amber INTAKE HEATER indicator goes out after two seconds. The intake air preheater is activated by turning the igni- tion switch to the on position ( Fig. 4.1 ). If the engine is at normal temperature, the amber INTAKE HEATER indicator goes out after two seconds. 4.6