Part of the Isuzu 4JJ1 engine documentation.
This is the factory Isuzu parts catalog for the 4JJ1TYSB03, a turbocharged 4-cylinder common-rail diesel engine. Across 84 pages it breaks the engine down system by system with exploded diagrams and Isuzu part numbers, so you can identify and order the exact component you need.Coverage runs from the engine gasket kit and cylinder head through the cylinder block, camshaft and valve train, turbocharger, fuel injection, cooling, and lubrication, plus the starter, generator, wiring harness, and the fuel water sedimenter. Each figure lists reference numbers, part numbers, quantities, and interchangeability marks tied to the effective machine serial ranges.Use it to match a worn or failed part to its correct number, confirm cooling and fan components before a repair, and check which parts fit your serial range. It is an English-language parts catalog for identification and ordering, not a step-by-step repair manual.
What's Inside This Isuzu 4JJ1TYSB03 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Fuel System | Fuel Injection System, Fuel Filter and Bracket, Water Sedimenter; Fuel | |
| Cooling System | Water Pump and Corrosion Resistor, Thermostat and Housing, Fan and Fan Belt, Oil Cooler and Oil Filter | |
| Engine | Engine Gasket Kit, Cylinder Head, Cylinder Block, Oil Pan and Level Gauge, Camshaft and Valve, Crankshaft, Piston and Flywheel, Timing Gear Case and Flywheel Housing, Engine Mounting, Inlet Manifold, Exhaust Manifold, Water Piping; Engine, Turbocharger System, Oil Pump and Oil Strainer, Oil and Vacuum Piping; Engine, Engine Electrical Control Parts | |
| Electrical System | Starter, Generator, Wiring Harness and Fuse, Fixing Parts; Wiring Harness, Switch and Relay; Instrument Panel | |
| Hydraulics & 3-Point Hitch | Emission Piping | |
| Other Components | Ventilation System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Crankshaft Gear Teeth Count | 44 teeth | p. 31 |
| Sensor Gasket Dimensions | ID=14.2 OD=19.2 | p. 63 |
| Head Gasket Thickness (Grade 1) | 1.05 mm | p. 11 |
| Oil Filler Gasket Dimensions | ID=32 mm, OD=40 mm | p. 15 |
| Glow Plug Voltage | 12V | p. 17 |
| Crankshaft Pulley Outer Diameter | 147 mm | p. 31 |
| Thermostat Opening Temperature | 82°C | p. 45 |
| Cooling Fan Specifications | 8 blades, 550 mm OD | p. 49 |
| Cooling Fan Belt Length | 996 mm | p. 49 |
| Starter Motor Power | 2.5 KW | p. 67 |
| Generator Output Current | 110A | p. 67 |
| Washer (PL) Dimensions | ID=6.4 mm, OD=18 mm | p. 69 |
Isuzu 4JJ1TYSB03 Common Problems This Manual Covers
Turbocharger failure and smoke
The 4JJ1 turbo commonly fails after high mileage or poor maintenance, causing power loss, excessive smoke, and a whine. The Turbocharger System figure identifies each turbo component by part number for correct ordering.
Manual Section: Turbocharger System p. 50Injector issues cause rough idle
Worn injectors produce rough idle, power loss, and black smoke on the common-rail 4JJ1. The Fuel Injection System section lists the injectors and rail parts so you replace the right components.
Manual Section: Fuel Injection System p. 52Water in fuel damages the system
Contaminated fuel and water ingress can foul injectors and cause hard starting. The Water Sedimenter; Fuel section identifies the water separator parts that protect the injection system.
Manual Section: Water Sedimenter; Fuel p. 80Overheating from water pump wear
A worn water pump loses coolant flow and drives engine temperature up. The Water Pump and Corrosion Resistor section shows the pump assembly and its parts for replacement.
Manual Section: Water Pump and Corrosion Resistor p. 42Stuck thermostat causes overheating
A thermostat stuck closed prevents coolant circulation and risks head gasket damage. The Thermostat and Housing section identifies the thermostat and housing parts by number.
Manual Section: Thermostat and Housing p. 44Slow cranking from a worn starter
A tired starter cranks slowly and can fail to spin the engine over. The Starter section breaks the assembly into component parts so you order only what is needed.
Manual Section: Starter p. 70Frequently Asked Questions
Which engine does this catalog cover?
It covers the Isuzu 4JJ1TYSB03, a turbocharged 4-cylinder common-rail diesel. Every figure and part number is specific to this engine variant and its listed effective machine serial ranges.
Is this a service manual or a parts catalog?
It is a parts catalog. It supplies exploded diagrams, reference numbers, and Isuzu part numbers to identify and order parts. It does not include repair procedures or torque specifications.
What is the thermostat opening temperature?
The Thermostat and Housing section lists a thermostat opening temperature of 82 degrees Celsius, which lets you confirm the correct thermostat before ordering. p. 45
Does it detail the cooling fan?
Yes. The Fan and Fan Belt section specifies a cooling fan with 8 blades and a 550 mm outer diameter, with part numbers for the fan and belt. p. 49
What format is this manual in?
You get an instant download of the full 84-page searchable Parts Catalog in PDF format. Works on any device, whether that's a laptop at your desk or a phone out in the field.
Can I print this manual?
Absolutely. The PDF is DRM-free, so print whatever sections you need for the shop. Standard letter or A4 paper works fine.
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