TM 55-1930-209-14&P-9-1 Table C-1.  Preventive Maintenance Checks and Services for Electrical Power Systems (Continued) B - Before D - During A - After H - Hourly Interval Interval Procedures: Equipment Is Item Item to be Check for and have repaired Not Ready/ No. B   D A H Inspected or adjusted as necessary Available If: SHIP SERVICE GENERATOR (SSG) SYSTEM WARNING Ear protection must be worn In voids 4 when any generator Is operating. WARNING At operating temperatures, engine coolant Is hot and under pressure.  It also contains alkaline materials harmful to eyes and skin. To avoid personal Injury check coolant level only when engine Is stopped and filler cap Is cool enough to be touched by the bare hand. If coolant comes In contact with eyes or skin, immediately flush affected area with clean water and seek medical assistance; CAUTION Sensing element must be submerged In coolant to operate.  If coolant is low, engine can overheat and automatic shutoff will not function to prevent damage to engine. 1 • 10 hrs Engine a.   Check engine coolant level-should not be more than 112 in.  below filler pipe.  Fill with dean, fresh water (low in scale- forming minerals but not softened water) - see table below.  Add cooling system conditioner to water before filling.  Condi- tioner should be 3 percent by volume of total coolant capacity (about 112 pint of conditioner per 2 gallons of water). 50% Antifreeze Without Water Content 50% Water Antifreeze Chlorides 100 ppm or less 50 ppm or less Sulfates 00 ppm or less 50 ppm or less Hardness as 200 ppm or less 100 ppm CaCo3 or less Dissolved 500 ppm or less 250 ppm Solids or less pH 6.5 or higher 6.5 or higher ppm = parts per million C-8