Part of the Isuzu 4JJ1 engine documentation.
This is the factory Isuzu parts catalog for the 4JJ1TASB01, a turbocharged 4-cylinder 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 exhaust silencer. Each figure lists reference numbers, part numbers, quantities, and interchangeability marks keyed to the effective machine number.This is a Japanese-market Isuzu catalog, but the section titles and part descriptions are in English, and a How to read this Parts Catalog page explains the reference and change marks. Use it to match a failed part to its correct number and confirm which components fit your serial range. It is a parts catalog for identification and ordering, not a repair manual.
What's Inside This Isuzu 4JJ1TASB01 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Fuel System | Fuel Injection System, Fuel Filter and Bracket | |
| 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 Cover, Cylinder Head, Cylinder Block, Oil Pan, 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 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine Overhaul Head Gasket Thickness (Grade 1) | 1.05mm | p. 11 |
| Oil Filler Gasket Dimensions | ID=32mm OD=40mm | p. 15 |
| Glow Plug Voltage | 12V | p. 17 |
| Crankshaft Metal Set Grade | GRADE=1 | p. 31 |
| Ring Gear Teeth Count | 122 teeth | p. 31 |
| Thermostat Opening Temperature | 82°C | p. 45 |
| Cooling Fan Diameter | OD=550mm | p. 49 |
| Fuel Feed Pump Voltage | 12V | p. 55 |
| Starter Assembly Voltage/Power | 12V 2.5KW | p. 67 |
| Generator Assembly Voltage/Current | 12V 110A | p. 67 |
Isuzu 4JJ1TASB01 Common Problems This Manual Covers
Turbocharger failure with power loss
Turbo failure is a common 4JJ1 complaint after high mileage or neglected oil changes, producing power loss, excessive smoke, and a whine. The Turbocharger System figure identifies every turbo component by part number for a correct replacement.
Manual Section: Turbocharger System p. 50Injector problems cause rough idle
Failing injectors bring rough idling, misfiring, and poor fuel economy on the common-rail 4JJ1. The Fuel Injection System section lists the injectors and rail components so you order the right parts.
Manual Section: Fuel Injection System p. 52DPF and EGR clogging in urban use
Short urban trips prevent full regeneration, so soot builds in the emission system and can trigger limp mode. The Emission Piping section identifies the related pipes and fittings by part number.
Manual Section: Emission Piping p. 64Overheating from a stuck thermostat
A thermostat that sticks closed drives coolant temperature up and risks head gasket damage. The Thermostat and Housing section shows the thermostat and housing parts for replacement.
Manual Section: Thermostat and Housing p. 44Head gasket failure and coolant loss
A failed head gasket causes overheating and coolant loss. The Engine Gasket Kit section lists the overhaul gasket sets in graded head-gasket thicknesses so you match the correct part number.
Manual Section: Engine Gasket Kit p. 10Slow cranking from a worn starter
A worn starter cranks slowly and can fail to turn the engine over. The Starter section breaks the assembly into its component parts so you replace only what is worn.
Manual Section: Starter p. 70Frequently Asked Questions
Which engine does this catalog cover?
It covers the Isuzu 4JJ1TASB01, a turbocharged 4-cylinder diesel. Every figure and part number is specific to this engine variant and its listed effective machine numbers.
Is the catalog in English?
It is a Japanese-market Isuzu parts catalog, but the section titles and part descriptions are in English, and a How to read this Parts Catalog page explains the reference, change, and interchangeability marks.
What is the thermostat opening temperature?
The Thermostat and Housing section lists a thermostat opening temperature of 82 degrees Celsius, which helps you confirm the correct thermostat when ordering. p. 45
Does it list the starter and generator ratings?
Yes. The Engine Electrical Control Parts section shows a starter rated 12V 2.5KW and a generator rated 12V 110A, with part numbers for ordering. p. 67
How quickly can I access this manual after buying?
It's an 84-page searchable PDF, available for immediate download. Works on any device, so you can reference it on your phone right at the bench. No shipping, no waiting.
Am I able to print pages from this manual?
Yes. The PDF has no DRM restrictions. Print any page or section you need for your shop. Works with any standard printer.
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