TM 10-3950-672-24-2
The Lucas CAV advance timing mechanism uses a
check ball in the circuit which, if omitted during
assembly, will result in no timing advance. If the pump
has been replaced or the mechanism has been removed
to fix a leak, the problem can be that the check ball is
missing.
Replacement of the spring and repair of the advance
timing mechanism must be performed by an authorized
injection pump service center.
Electrical Shut Off Valves
The injection pumps are equipped with electrical shut off
valves.
These solenoid-operated valves block the
supply of fuel to the high pressure pumping and
distribution components.
The Lucas CAV DPA shut off valve is located at the
bottom. rear of the pump.
The valves are designed to be closed when there is no
electrical power to the solenoid.
When the valve on the Lucas CAV pump opens, a
"click" can be heard.
Use the following values to check the solenoid with an
Volts to Energize
Volts
Ohms
(Minimum)
12
9@ 22 C (71.6F)
9
5-75