Yanmar 1GM User Manual page 156

150
ernor linkage/or easier pump removal and
installation.
6.
Lift the injection pump out of the engine while care-
fully disengaging the governor linkage from the pump.
7. Remove the timing shims (Figure 34) and set them
aside for reinstallation.
8. To reinstall the injection pump, reverse the removal
procedure. Make sure to reinstall the timing shims and en-
gage the control rack pin (F igure 35) with the governor
lever fork. Tighten the pump retaining nuts to 25 Nom ( 18
ft.-lb.). Bleed the fuel injection system as previously de-
scribed. Run the engine and check for leaks.
FUEL TRA!\'SFER PUMP
The engine is equipped with a fuel transfer pump (A,
Figu re 36) to move fuel from the fuel tank to the fuel filter
and fuel injection pump. A cam lobe on the engine cam-
shaft operates the pump lever (F igure 37), which moves
the fuel pump diaphragm to pump the fuel. Fuel pump
pressure is approximately 9.7 kPa (1.4 ps i).
The transfer pump outpu t port on l GM and IGM IO en-
gines is on the left side with the pump moun ted on the en-
gme . On all other engines, the output po rt is on the right
side.
Fue l Pump Testing
WARNING
Always have a fire extinguisher, rated for
file! and electrical fires, on hand when ser-
vicing any part ofthefue! system. Clean up
any spilledfuel as soon as possible.
I. Loosen the air bleed screw (F igure
38) on the fuel fil-
ter.
CHAPTER SEVEN
2. Operate the engine starte r. If the fuel transfer pump is
operating properly, fuel will flow from the air bleed screw
hole.
3. If fuel does not flow from the air bleed screw hole, dis-
connect the outpu t fuel line (B, Figure 36) from the fuel
pump.
NOTE
Be prepared to catch fuel expelledfrom the
pump.
4. Operate the engine
starter. If fuel
docs not flow from
the fuel pump, replace the pump.
Re mo val and Installation
I. Close the fuel tank valve.
NOTE
Accountfor the sealing washers on thefue!
hose ends.