Part of the Isuzu 4JB1 engine documentation.
This Isuzu Parts Catalog covers the 4JB1PA-06S and 4JB1PA-020 (PA20) diesel engines fitted to the TL26, within serial number range 2620002 to 2620779. It runs 67 pages with a text layer and uses exploded diagrams keyed to genuine Isuzu part numbers, reference numbers and quantities.Because it is an illustrated parts catalog rather than a repair manual, its job is exact identification and ordering. Sections cover engine mechanical parts, the lubrication, cooling and fuel systems, air intake and exhaust, and the electrical system, including the starter, generator and glow plugs.Use it to match the right piston, gasket, water pump, injection nozzle, oil filter cartridge or starter to your engine before you buy, and to confirm quantities and interchangeability. Note the two oil filter cartridge diameters, 102 mm and 90 mm, differ by variant. Download instantly and print the pages you need at the parts counter.
What's Inside This Isuzu 4JB1PA-06S, 4JB1PA-020, PA20 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Engine Mechanical | 24-34 | Cylinder Head, Cylinder Block, Timing Gear, Crankshaft, Piston, Valve Mechanism |
| Lubrication System | 29-36 | Oil Pan, Oil Pump, Oil Filter, Oil Pipes |
| Cooling System | 37-38, 47 | Water Pump, Cooling Fan, Thermostat, Radiator |
| Fuel System | 41-42, 45, 50-61 | Injection Nozzle, Fuel Pipe, Injection Pump, Fuel Filter |
| Air Intake & Exhaust System | 39-40 | Intake Manifold, Exhaust Manifold, Air Cleaner |
| Electrical System | 46, 62-63 | Starter, Generator, Glow Plugs, Relays, Solenoids |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| VINYL PIPE Dimensions | ø9Xø6X2.5m | p. 22 |
| Cylinder Head Bolt Length | 122mm | p. 24 |
| Oil Level Gauge Length | 622mm | p. 29 |
| Flywheel Ring Gear Teeth Count | 108 | p. 32 |
| Cooling Fan Diameter | 400mm | p. 38 |
| Glow Plug Voltage | 12V | p. 46 |
| Nozzle Shim Thickness | 0.500mm | p. 58 |
| Starter Rating | 12V-2.2KW | p. 62 |
| Generator Rating | 12V-35A | p. 63 |
| 4JB1PA-06S | ||
| Oil Filter Cartridge Diameter | 102mm | p. 35 |
| 4JB1PA-020 | ||
| Oil Filter Cartridge Diameter | 90mm | p. 35 |
Isuzu 4JB1PA-06S, 4JB1PA-020, PA20 Common Problems This Manual Covers
Overheating and cooling parts
When overheating traces to the cooling circuit, you need the correct water pump, thermostat and cooling fan. The Cooling System section shows these parts in exploded views with their part numbers.
Manual Section: Cooling System p. 37Oil leaks and worn seals
Weeping oil usually means tired gaskets and seals around the oil pump and pipes. The Lubrication System section identifies the oil pan, oil pump, oil filter and pipe parts to order.
Manual Section: Lubrication System p. 29Low compression rebuild parts
A worn top end needs matched pistons, rings, liners and valve mechanism parts. The Engine Mechanical section shows the cylinder head, block, crankshaft and piston assemblies with reference numbers.
Manual Section: Engine Mechanical p. 24Fuel delivery and injection parts
Sudden stalling or hard starting often means fuel system parts are due. The Fuel System section covers the injection nozzle, fuel pipe, injection pump and fuel filter for correct ordering.
Manual Section: Fuel System p. 41Hard starting electrical parts
Slow cranking or no start can call for a new starter or glow plugs. The Electrical System section identifies the starter, generator, glow plugs, relays and solenoids by part number.
Manual Section: Electrical System p. 46Air intake and exhaust parts
A restricted intake or leaking exhaust needs the right manifolds and air cleaner. The Air Intake and Exhaust System section shows the intake manifold, exhaust manifold and air cleaner parts.
Manual Section: Air Intake & Exhaust System p. 39Frequently Asked Questions
Which engines and serial numbers does this catalog cover?
It covers the Isuzu 4JB1PA-06S and 4JB1PA-020 (PA20) engines used in the TL26, for serial numbers 2620002 to 2620779, as shown on the catalog cover and reference pages.
Does this include repair procedures?
No. This is an illustrated parts catalog, not a service manual. It provides exploded diagrams, part numbers, quantities and interchangeability data for identifying and ordering parts, not step by step repair instructions.
How do I find the correct oil filter cartridge?
The Lubrication System section lists the cartridge by variant. The 4JB1PA-06S uses a 102 mm diameter cartridge and the 4JB1PA-020 uses a 90 mm cartridge, so match yours before ordering. p. 29
How is the catalog delivered?
You download the PDF instantly after purchase. There is no shipping, and the file is yours to keep and print whenever you order parts.
What format is this Isuzu PA20 manual in?
You get the full 67-page searchable Parts Catalog as an instant PDF download. Works on any device, from a laptop at your desk to a phone on the shop floor.
Are there any print restrictions on this Isuzu PA20 manual?
No restrictions at all. Print as many copies as you like. Most mechanics print the relevant section and take it to the workbench.
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