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 |
