TM5-6115-593-34NAVFAC P-8-631-34TO-35C2-3-463-2allow bearings to seat-, and to purge all airfrom the system.(11) Before starting calibration, check pumpfuel flow-in the flowmeter for air. If air ispresent, correct leak before continuing test.(12) The test fuel oil must be 90 to 100F (32 to38C).(13) Set gear pump at 8 inches (203 mm) Hg.vacuum during run-in.(14) CalibrationProcedure.(a) Close idle, leakage, and pressurevalves. Open flow control or needlevalve wide open.(b) Increase pump speed to engine ratedspeed.(c) Adjust vacuum valve in fuel pumpsuction line to obtain 8 inches (203 mm)Hg on vacuum gauge.(d) If you cannot obtain 8 inches (203 mm)of vacuum, check for restriction in teststand filter or fuel supply line.(e) Close the fuel manifold orifice valveuntil the flowmeter shows 168 psi (1159kPa) at 1800 rpm. There must be no airvisible in the flow- meter. Disregardchange in vacuum readings at thissetting.(f) If flow cannot be obtained and held,check idle plunger and governor break.Inspect pulsation damper diaphragm.(g) Open fuel pressure gauge valve. Withthrottle in full fuel position, increasepump speed until point at which fuelpressure just begins to decrease (peakpoint). This should occur at 2090 rpm.(h) If speed is lower than specified, addshims between governor spring andretainer. To reduce speed, removeshims.Figure 13-25. Fuel Pump Damper, Exploded View13-42
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
