Isuzu KB P190. Manual — part 397
FUEL SYSTEM (4JK1/4JJ1) 6C-47
Fuel Filler Cap
General Description
A vacuum valve and pressure valve are built into the
fuel filler cap which adjusts the fuel pressure in the fuel
tank to prevent fuel tank damage.
RTW46CSH000301
Legend
1. Seal
Ring
Inspection
The fuel filler cap must be inspected for seal condition.
The fuel filler cap must be replaced if found defective.
Note: A replacement fuel filler cap must be the same as
the original. The fuel filler cap valve was designed
primarily for this application and must be replaced with
the same type or decreased engine performance may
occur.
ENGINE ELECTRICAL (4JK1/4JJ1) 6D-1
SECTION 6D
ENGINE ELECTRICAL
TABLE OF CONTENTS
Charging System . . . . . . . . . . . . 6D-2
Servicing Cautions . . . . . . . . . . .. 6D-2
Important Generator Components and
Function. . . . . . . . . . . . . . .. 6D-2
Troubleshooting . . . . . . . . . . . .. 6D-5
Diagnosis. . . . . . . . . . . . . . . 6D-7
Specifications . . . . . . . . . . . . .. 6D-8
Unit Servicing (4JJ1) . . . . . . . . . ...
Disassembly. . . . . . . . . . . . . 6D-10
Inspection and Repair . . . . . . . . . . 6D-11
Rotor Assembly . . . . . . . . . . ... 6D-11
Stator Coil . . . . . . . . . . . . . 6D-12
Brushes . . . . . . . . . . . . . ... 6D-12
Rectifier . . . . . . . . . . . . . ... 6D-13
Regulator Assembly. . . . . . . . . . 6D-13
Measuring Procedure . . . . . . . . .. 6D-13
Reassembly. . . . . . . . . . . . . . 6D-14
Final Assembly. . . . . . . . . . . . 6D-14
Starter Motor . . . . . . . . . . . . . .. 6D-15
Starting Circuit Diagram . . . . . . . . .. 6D-15
Removal and Installation . . . . . . . . . 6D-15
Important Operations – Removal. . . . . 6D-15
Important Operations – Installation. . . .. 6D-15
Disassembly. . . . . . . . . . . . . 6D-16
Disassembly Steps . . . . . . . . . .. 6D-16
Important Operations. . . . . . . . ... 6D-17
Inspection and Repair . . . . . . . . . . 6D-20
Armature. . . . . . . . . . . . . .. 6D-20
Yoke. . . . . . . . . . . . . . . . 6D-21
Brush and Brush Holder . . . . . . . .. 6D-22
Overrunning Clutch. . . . . . . . . .. 6D-22
Bearing . . . . . . . . . . . . . . 6D-23
Reassembly. . . . . . . . . . . . . . 6D-24
Reassembly Steps. . . . . . . . . ... 6D-24
Important Operations. . . . . . . . ... 6D-25
Inspection After Assembly . . . . . . ... 6D-26
Magnetic Switch . . . . . . . . . . . .. 6D-27
Torque Specifications. . . . . . . . . .. 6D-28
Pre-Heating System . . . . . . . . . . ... 6D-29
Inspection and Repair . . . . . . . . . . 6D-29
Visual Check. . . . . . . . . . . . 6D-29
6D-2 ENGINE ELECTRICAL (4JK1/4JJ1)
Charging System
Servicing Cautions
• Battery polarity is important. If the battery cables
are reversed, the generator diodes will be
destroyed.
• Do not remove the battery cables or the charging
circuit wiring when the engine is running.
• Confirm that the terminal wires are connected to
the proper terminals by checking the terminal
numbers (the number on the terminal wire and the
terminal must be the same).
• Disconnect the battery negative cable (-) before
inspecting the generator.
• Do not open or close the battery relay switch when
the engine is running.
• Disconnect the battery negative cable (-) when
using external equipment (Quick-Charge) to
charge the battery.
• When steam cleaning or washing the engine, do
not allow steam or water to come in direct contact
with the battery and other electrical system
components.
• Be sure to read the item on belt tension
adjustment before beginning the procedure.
Important Generator Components
and Function
• The generator used on 4JK1 engine cannot be
disassembled.
• The generator uses a built-in solid-state IC voltage
regulator. The regulator and other important
components together with their connections are
shown in the illustration.
• The voltage regulator is installed to the rear cover
assembly of the generator together with the brush
holder and the rectifier. The generator requires no
additional voltage regulation.
• 9 diodes are connected to the stator coil to convert
AC to DC. The DC voltage is delivered to the
generator output terminal.
ENGINE ELECTRICAL (4JK1/4JJ1) 6D-3
AC Generator (4JK1)
RTW56DMF000501
AC Generator (4JJ1)
RTW76DMF000101
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