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) .......................................

......6D-9

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

Glow Relay .................................................. 6D-29

Glow Plug .................................................... 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