AIR-FUEL RATIO CONTROL MAINTENANCE - CONTINUED
FUEL RATIO CONTROL ADJUSTMENT - CONTINUED
Work carefully around an engine that has been started. Failure to follow this warning may cause injury or
Start engine (TM 5-3805-248-10) and operate it for a minimum of five minutes to raise governor and engine tempera-
ture to normal operating temperature.
Hold retainer (45) in position to keep fuel ratio control diaphragm from turning. Loosen nut (44).
Turn valve extension (43) to get correct setting. A clockwise direction gives a more positive setting. Counterclockwise
direction will give a more negative setting. Several adjustments of valve extension (43) may be needed to get correct
dynamic fuel ratio control setting.
After each adjustment is made, check dynamic fuel ratio control setting. Start engine (TM 5-3805-248-10). Run engine
at 900 RPM and rapidly move governor control shaft to full FUEL ON position. Read measurement on dial indicator.
Record maximum dial indicator reading.
If correct dynamic fuel ratio control setting cannot be made with this adjustment, internal governor linkage
must be checked and adjusted or fuel ratio control needs repair or replacement.
After correct adjustment has been made, tighten nut (44). Check dynamic fuel ratio control setting again.