Need a part number for your 4JB1 diesel and the engine's already on the floor? This 67-page Isuzu parts catalog covers the 4JB1PA-06S, 4JB1PA-020, and PA20 variants with 50 pages of exploded views: cylinder head, crankshaft, piston, timing gear, and valve assemblies. Lubrication, cooling, fuel injection, and electrical systems each get full parts breakdowns. Specific details like the 102mm oil filter cartridge on the 06S model and the 108-tooth flywheel ring gear are called out with factory part numbers and cross-references. TL26 application coverage is included. Bookmarked PDF, searchable on any device. Jump straight to the system diagram you need or search by keyword.
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
Isuzu 4JB1PA engine overheating, need correct water pump and thermostat part numbers for replacement p. 37
Check the cooling system exploded view starting on page 37. Locate the water pump assembly and thermostat housing in the parts list. The cooling fan listed is 400mm diameter; verify your fan matches before ordering. Cross-reference each part number against the parts number list to confirm availability and compatibility with your serial number range.
Manual Section: Cooling SystemOil leaks at cylinder head gasket, can't identify correct head gasket part number p. 24
Turn to the engine mechanical exploded view starting on page 24. Cylinder head bolt length is spec'd at 122mm; use this to verify you're on the right assembly diagram. Locate the head gasket part number in the breakdown and confirm fitment for your serial number in the parts index.
Manual Section: Engine MechanicalNeed piston ring and cylinder liner part numbers for low compression rebuild p. 32
Refer to the piston and cylinder liner exploded view on page 32. Identify each ring set and liner by part number in the accompanying list. Head bolts in this assembly measure 122mm; confirm yours match before ordering reassembly parts. Verify all part numbers against the index for correct serial number range coverage.
Manual Section: Engine MechanicalEngine stops suddenly, need rail pressure sensor and fuel pump part numbers p. 41
Start with the fuel system exploded views on page 41 for the injection pump and related sensors. Nozzle shim thickness is 0.500mm per page 58; note this when ordering injector rebuild kits. Pull the fuel pump and sensor part numbers from the list, then verify each against the master index.
Manual Section: Fuel SystemCan't find correct oil filter cartridge part number, unsure which fits my engine variant p. 35
Go to the lubrication system exploded view starting on page 29. Oil filter cartridge diameter is 102mm for the 4JB1PA-06S and 90mm for the 4JB1PA-020, both shown on page 35. Measure your existing cartridge to confirm which variant applies, then verify the part number in the index for your serial number range.
Manual Section: Lubrication SystemGlow plugs and starter motor failing, need correct electrical component part numbers p. 46
Look up glow plug part numbers on page 46 (rated 12V). The starter motor appears on page 62 at 12V-2.2KW, and the generator on page 63 at 12V-35A. Match each part number against the master list for your engine serial number before placing the order.
Manual Section: Electrical SystemFrequently Asked Questions
What are the replacement specifications for Piston rings?
For the 4JB1.-TURBO engine, the piston ring set part number is 894247-8671. Other models (4JB1PTO, TPA, TPB, TPX) use 897029-8640. Both are supplied as part of the cylinder liner kit.
What are the replacement specifications for Cylinder liners?
The cylinder liner part number is 894247-8612. It's included in the cylinder liner kit for the 4JB1.-TURBO engine and also appears in the cylinder block assembly listing.
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.
Reviews
There are no reviews yet.