TM 5-3805-290-23-1
THEORY OF OPERATION - CONTINUED
0003 00
FUEL SYSTEM - CONTINUED
(2)
Delivery valve ensures that pressure waves do not allow a reopening of injector. Pressure waves are cre-
ated at the end of injection process. Valve cone is lifted by fuel pressure.
(3)
Fuel is forced through fuel line to injector. Delivery ends and fuel pressure drops. Valve spring presses
valve cone onto valve seat. Reopening a fuel injector has a negative effect on emissions.
427-B1519
427-B1520
d.
Timing.
(1)
Retarding of fuel injection is direct rela-
tionship between start of injection and
piston position. Timing compensates for
higher engine by advancing start of
injection.
(2)
Timing advance for timing mechanism
for fuel injection pump.
427-B1521
0003 00-10