TM 5-3805-262-343-1. ENGINE MAINTENANCE (CONT)a. EngineTune-up (SHEET16OF21).(7) Fuel Injection Governor Adjustments (Cont).Idle Speed Adjustment.Start engine and operateuntil normal operatingtemperature is obtained.With engine idling, presstachometer against enginetachometer drive shaft. Whentachometer pointer stopsmoving, note indication.Engine idle speed should be700 to 750 rpm.NOTETachometer drive shaft operates at half engine speed. Double tachometerindication to obtain engine rpm.If tachometer indication is not 700 to 750 rpm, perform the followingto adjust idle speed.Remove cap nut and gasket.Loosen nut and turn idle speedscrew 1/4 turn using screw-driver. To increase idle speed,turn screw clockwise; todecrease speed, turn screwcounterclockwise.Hold idle speed screw usingscrewdriver and tighten nut.Check if tachometer indicatesidle speed of 700 to 750 rpm.Repeat steps 4 thru 6 above un-til idle speed is 700 to 750rpm.Install gasket and cap nut.3-18
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