3-63. FUEL PUMP TESTING AND CALIBRATION (Contd)
g. Governor Cutoff RPM Check (Contd)
Slow button (23) and stop
a. Depress slow button (23) to slow
test stand to minimum speed.
b. Depress stop button (24) to stop
Governor spring pack
Remove from fuel pump main
housing (43) and snapring
Remove to decrease governor
Each 0.001 in. (0.025 am)
cutoff speed and add to increase
thickness of shim will change the
governor cutoff speed.
governor cutoff speed about 2 rpm.
Shims are available in 0.005,
0.010, and 0.020 in. (0.127, 0.254,
and 0.508 mm) thickness. They
should be placed between gover-
nor spring (97) and retainer (98).
If more than 0.150 in. (3.81 mm)
total shim thickness is required,
replace governor spring (97).
Snapring (95) and governor
Install on fuel pump main
After installing shims, snapring,
spring pack housing (43)
and spring pack housing, purge
the fuel pump of air as described
in step 47. When fluid in flowme-
ter glass tube is clear again,
recheck governor cutoff point as
described in steps 54 through 56.