TRUNNION AS 4687851 - Caterpillar

Components and Features of the Stanadyne Fuel Injection Pump
Illustration 11 g00297106
Components of the fuel injection pump (Stanadyne)
(1) Electrical connection for stop solenoid
(2) Connection for fuel return line
(3) Low idle speed adjustment screw
(4) High idle speed adjustment screw
(5) Flange nut
(6) Nut for end cap
(7) Fitting for fuel discharge
(8) High pressure fuel injection lines
(9) Adjustment screw for timing advance The Stanadyne fuel injection pump is installed on the naturally aspirated engines.The internal adjustment for the fuel injection pump timing is tamper proof. The low idle is adjustable. The fuel injection pump has a boost control and an engine stop solenoid. The pump also has a self-vent feature which removes air from the pump.The fuel injection pump has an electrically operated automatic timing advance unit which holds the timing of the pump in an advanced position when the engine is cold. The advance lever of the pump is enclosed within the pump housing. The automatic timing advance unit is connected by a shaft to the advance lever for the timing of the fuel injection pump. The automatic timing advance unit and the advance lever are internal components of the Stanadyne fuel injection pump. The automatic timing advance unit is not adjustable.A temperature switch is installed in the coolant passage which is located at the rear of the timing case. The temperature switch sends current to the electrical connection (9) of the automatic timing advance unit (not shown) when the engine is started and when the engine is below normal operating temperature. The body contains a wire coil with high electrical resistance. The wire coil surrounds an element which is filled with wax. The wire coil heats the wax which then expands. The expansion of the wax forces a rod to move the lever of the timing advance. The lever continuously adjusts the pump to the correct timing for the normal operating temperature.Operation of the Delphi DP200 Series Fuel Injection Pump
Illustration 12 g00296984
Components of the fuel injection pump (Delphi DP200 Series)
(1) O-ring
(2) Hub nut
(3) Locking spacer
(4) Locking screw
(5) Low idle adjustment screw
(6) High idle adjustment screw
(7) Fuel return line connection
(8) Electrical connection for stop solenoid
(9) Fuel supply connection
(10) Mounting flange
(11) Connection for the high pressure fuel injector lines
(12) Adjustment screw for timing advance
(13) Fitting for the fuel discharge line The Delphi fuel injection pump is installed on the naturally aspirated engine and the turbocharged engine. The internal adjustment for the pump timing is tamper proof. The low idle is adjustable. The fuel injection pump has a boost control and an engine stop solenoid. The pump also has a self-vent feature which removes air from the pump.The fuel injection pump has an electrically operated cold starting aid which holds the timing of the pump in an advanced position when the engine is cold. The advance lever of the pump is enclosed within the pump housing. The cold starting aid is connected by a shaft to the advance lever for the timing of the fuel injection pump. The lever that is used to advance the pump