TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Fuel Shutoff Valve (005-043)
Section 5 - Fuel System - Group 05
Page 5-73
The Bosch valve does not make a very loud sound when
actuated, but it can be checked with an ohmmeter for the
following values:
Bosch Shutdown
Peak Am-
Values
Ohms
peres
12 VDC
7.4 + 0.5
2
24 VDC
29.5 + 2.5
1
CAUTION
Do not connect the electrical wire to the solenoid when
the plunger has been removed. Without the plunger,
the valve can be damaged.
Malfunctioning valves and electrical wiring to the valve can
be diagnosed by removing the plunger and spring, and
then reinstalling the solenoid.
If the engine will start without the valve, the valve or the
wiring to the valve is malfunctioning.
This method of removing the plunger to start the engine
can be used, if necessary, to move the equipment to a
service location.
NOTE: Use the mechanical shutdown lever to stop the
engine.
Delivery Valves (Back Leakage Valves on Lucas CAV
Pumps)
There is a valve for each discharge tube. The purpose of
the valve is to control the residual pressure in the high
pressure line. A malfunctioning valve will cause an imbal-
ance of the residual pressure resulting in rough engine
operation or surging.
L-933
