C8.3 Commercial Marine and Ind [...] Normal Starting Procedure Section 1 - Operating Instructions Page 1-9 Start the engine with the throttle in the IDLE position. This black push button (5) is used to engage the starter motor. CAUTION The engine must have adequate oil pressure within 15 seconds after starting. If the WARNING lamp indicating low oil pressure has not gone out or there is no oil pressure indicated on a gauge within 15 seconds, shut off the engine immediately to avoid engine damage. The low oil pressure troubleshooting procedure is located in Troubleshooting Symptoms (Section TS).