Engines Operating the engine with no oil pressure will dam- age the engine. Caterpillar NOTE: Before doing these steps, do the steps in "Pre-Start." OFF ON 1. Turn the ignition switch to the on position ( Fig. 4.1 ). The amber CHECK ENGINE indicator comes on for five seconds. ACC START IMPORTANT: On vehicles equipped with an intake air preheater, the amber INTAKE HEATER indica- tor stays on for a minimum of two seconds, re- gardless of coolant temperature. Wait until the IN- TAKE HEATER indicator goes out before attempting to start the engine. f600371b 01/15/96 Fig. 4.1, Ignition Switch Positions 4.
Check the oil pressure gauge for any drop in lubri- cating oil pressure or mechanical malfunction in the lubricating oil system. Minimum oil pressure at idle is 7 psi (50 kPa). 2. Turn the ignition switch to the start position. Re- lease the switch the moment the engine starts. 2.1 If the engine does not start after 15 to 20 seconds of cranking, turn the ignition switch off. CAUTION 2.2 Wait two minutes to allow the starter motor to cool. Turn the ignition switch back to the on position and try to start the engine again. Do not rev the engine if the oil pressure gauge indi- cates no oil pressure. Shut down the engine if no oil pressure appears within approximately ten sec- onds.
Check to determine the cause of the problem. 4.3