Read the following passage very carefully and then answer the question: “Before starting a diesel engine, there are certain preparations to be made, these are common and applicable for all diesel engines. Among these; checking the fuel service tank to see that if it is topped up; sounding the oil level in the sump tank and the lubricating oil tank as well as the turbocharger and the governor, checking that the relevant valves for sea water, cooling water lubricating oil and fuel oil are open; starting the standby oil pump for lubrication of bearings; opening the main valve on the starting air receiver; turning the engine slowly without fuel can be mentioned.” One of the following procedures is NOT a step when making preparations before starting a diesel main engine. Choose and mark that step: