Start engine (para. 2-12) and check Instruments do not engine instruments on instrument panel read within limits for steady, normal readings as follows: given. a. Oil pressure gauge (7) – 35-70 psi a. Oil pressure reads (241-483 kPa). less than 35 psi (241 kPa). b. Speedometer (8) – indicates vehicle speed. Listen for unusual noises. c. Tachometer (9) – idle: 750-850 rpm. d. Engine temperature gauge (10) – d. Temperature 160°-230°F (71°-110°C). reads more than 230°F (110°C). e. Transmission temperature e. Temperature reads gauge (11) – 160°-300°F (71°-149°C). more than 300°F (149°C) when engine is at normal operating temperature. f. With engine at idle speed (750- f. Air buzzer and/or 850 rpm), listen for air buzzer and indicator light will watch air indicator light (12). not come on below 65 psi (448 kPa), or will not shut off above 65 psi (448 kPa). Table 2-2. Operator/Crew Preventive Maintenance Checks and Services (Contd). ITEM NO. INTERVAL ITEM TO CHECK/ SERVICE PROCEDURE NOT FULLY MISSION CAPABLE IF: TM 9-2320-386-10 2-23 5 Before Instru- Operation ments (Contd) CAUTION If oil pressure reading is below normal, or if temperature read- ing is over 230°F (110°C), shut down engine at once, or engine may be damaged. WARNING Hearing protection is required when maintaining vehicle with engine running. 12 11 10 9 8 7