TM 10-3930-669-10 Table 2-3.  Operator Preventive Maintenance Checks and Services - CONT. Location Item Interval Item to Procedure Not Fully Mission No. Check/Service Capable If: DAILY- ENGINE Continued 23 During Engine Listen for unusual noise, misfiring, and Engine is idling rough, rough idling of engine.  Notify Unit misfiring, or making Maintenance. unusual noise. 24 After Fuel/Water Check fuel/water separator for leaks Any leak present. Separator and damage.  Open drain cock and drain water into suitable container (approximately one pint). 25 After Tires, Lug Nuts, Check for missing lug nuts.  Check tires Two or more lug nuts and Wheels for tread wear.   are missing from the same wheel. No tread evident across the entire contact surface of the tire. 2-23