Service manual

Electrical System
10-57
Model 3606 • Origin 10/99
a. Thermo-Start Plug Removal
1. Label and disconnect the thermo-start wiring lead at
the thermo-start plug electrical connector.
2. Disconnect the fuel line.
3. Remove the thermo-start plug by unthreading it from
the intake manifold.
b. Disassembly
DO NOT disassemble the thermo-start plug. Replace a
defective plug with a new one.
c. Cleaning and Drying
DO NOT submerge the thermo-start plug. Clean the
exterior of the plug in an approved solvent. Dry the plug
with a clean, lint-free cloth.
d. Inspection and replacement
Examine the fuel line and the thermo-start plug mounting
bore in the intake manifold for any contamination and
clean as required.
Test the thermo-start plug coil using short, heavy-gauge
wires connected to a fused or otherwise protected 6-amp
minimum output, 12-volt DC power supply. If the coil fails
to heat, replace the thermo-start plug with a new one.
e. Thermo-start Plug Installation
1. Thread the thermo-start plug (Fig. 10– 56) into its
mounting bore in the intake manifold.
2. Connect the fuel line to the thermo-start plug.
3. Connect the wiring lead to the thermo-start plug
terminal.
10.8.5 Fuel Run Solenoid
The fuel run solenoids a valve that lets fuel enter the
injection pump when the ignition switch is turned to the
START or RUN positions. The fuel run solenoid is located
as follows:
On the side of the fuel injection pump (2, Fig. 10– 57).
Figure 10– 57. Perkins engine fuel-run solenoid.
On the rear of the fuel injection pump, connected to
mechanical linkage (2, Fig. 10– 58).
Figure 10– 58. Cummins engine fuel-run solenoid.
PERKINS ENGINE
1. Fuel Injector Pump
2. Fuel-run Solenoid
MS2450
1
2
CUMMINS ENGINE
1. Fuel Injector Pump
2. Fuel-run Solenoid
MS1690
1
2