TM 9-2350-277-20-2 PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDING LUBRICATION INSTRUCTIONS — Continued 0155 00 ITEM NO. INTERVAL MAN- HOUR ITEM TO BE CHECKED OR SERVICED CREWMEMBER PROCEDURE EQUIPMENT NOT READY/ AVAILABLE IF: b.  If outside temperature is less than 85 F (29 C), normal operating temperature should be 160 F to 200 F (71 to 93 C). If outside air temperature is greater than 85 F (29 C), normal operating temperature should be 160 to 225 F (71 to 107 C) c.  With range selector in SL, engine should idle smoothly at 650 to 700 rpm. Tachometer above 700 or below 650 rpm. d.  High or low engine idle speed is usually caused by accelerator linkage being out of adjustment. Adjust linkage if necessary (WP 0214 00). e.  Rough idling is usually caused by faulty injector timing and rack setting, faulty injectors or air in the injection system. Notify direct support maintenance. 4 Semi- Annual Governed No Load Test a.  Run engine at 800 rpm for 3-5 minutes with range selector in 1 range and brakes locked until normal engine operating temperature is reached. Engine runs hot or rough. b.  If outside temperature is less than 85 F (29 C), normal operating temperature should be 160 F to 200 F (71 to 93 C). If outside air temperature is greater than 85 F (29 C), normal operating temperature should be 160 to 225 F (71 to 107 C) c.  With range selector in SL, slowly open throttle control until accelerator is fully depressed. CAUTION When you suspect a faulty governor, do not exceed 3,000 rpm engine speed for more than 2 or 3 seconds. d.  Engine speed may exceed 3,000 rpm momentarily, but should stabilize at 2,925 to 2,975 rpm. If governor cuts in and out, or surges at this speed, adjustments are needed. 0155 00-36