through a micro-switch controlled circuit, when rpm
NOTE
exceeds 1935 15 rpm.
A characteristic of the Roosa-Master
b.
Fuel System Flushing Procedure for Engine
fuel injection pump is that if engine
Model 687C-18-ES.
misfiring occurs and it is traced to a
(1) Disconnect fuel line at pump inlet and
certain cylinder in which no
place end of line in a suitable container.
combustion is taking place, the
(2) Pump the hand primer (para 2-8 ap)
cause may be a nozzle valve sticking
several times to flush the lines and filters.
open
in
the
cylinder
which
(3) Reconnect fuel line to pip inlet. Be sure
immediately precedes that cylinder in
the fuel line connector screws, are set at proper torque
the firing order. During injection to
of 420 inch-pounds.
the cylinder which has the nozzle
valve sticking in the open position,
NOTE
the fuel rushes into that cylinder with
New fuel line connector washers
no restriction, causing a scavenging
should be installed every time the
effect in the pump distributor rotor
fuel line connector screws are
and a void which cannot be reached
loosened.
to a sufficient degree to provide
opening pressure of fuel to the
(4) Disconnect injector fuel lines at the
following nozzle valve. Hence, no
injectors.
combustion can take place.
(5) Crank the engine with starter for thirty
seconds.
c.
Fuel System for Engine Model D333TA. The
fuel is drawn from supply tank by a gear type transfer
(6)
Reconnect injector fuel lines
pump that forces fuel through a drilled
Figure 3-43. Fuel injector and fuel line removal and installation (engine model 687C-18-ES).
3-56
