Description

Isuzu 6WG1 Parts Catalog – 207 Pages of OEM Factory Part Numbers

You’ve got an Isuzu 6WG1 Parts Catalog sitting on the bench. That’s 207 pages of factory-original exploded diagrams, part numbers, and cross-indexes. Not a scanned-in mess from some third-party reprint house. This is the same PDF the dealer parts counter uses when they look up a 6WG1 common-rail diesel. I’ve seen guys waste an hour digging through aftermarket catalog applications that don’t match the serial number. With this, you look at the ID plate on the block, flip to the Engine Models Table on page P-4, and you’re done. The production month/year tells you exactly which variant you’re working on. No guesswork.

How the Part Number Search Works

First thing you need to understand: this catalog expects you to read the ID plate on the engine. It’s printed in Japanese and English. You’ll see the engine model name (e.g., A-4BG1TPG) and the completion date. Page P-2 walks you through it. You match that to the Engine Models Table on page P-4, which lists every 6WG1 application by customer and year—XYSS02, XYSA03, XYGD01, XYBW01, etc. Each line tells you if the model is discontinued (marked with a triangle) and what the original equipment was: generator sets, Hitachi excavators, Sumitomo machines, Isuzu America engines. That single table saves you from ordering the wrong piston kit or gasket set.

Engine Models Table and ID Plate Reading

Page P-4 isn’t just a list—it’s a timeline. The table shows which customer each engine went to and what year the production started or ended. For example, XYSS02 appears under 2005 for general power use; XYSA03 for hydraulic excavators ZX450, ZX650, ZX850. If your engine’s ID plate shows a 2007 build date, you’ll know which figure number cluster to use. Don’t skip this step. I’ve seen guys pull a head gasket for a 2005 engine that changed in 2006 because the injection pump bracket got shifted. The catalog warns you that part numbers are subject to change without notice. That’s why you use the production date, not the model year.

Why OEM Parts Catalog Beats Aftermarket Parts Databases

I can’t count how many times a fancy aftermarket “cross-reference” site gave me a part number that turned out to be an alternator bracket when I needed a timing gear cover. This catalog uses genuine Isuzu factory numbers. The Abbreviation List on page P-14 decodes every acronym on the diagrams. The Alphabetical Index runs from page P-1 to P-8—every part name in alphabetical order with the figure number and key page. Need a cylinder head cover? Look up “COVER, CYL” and you’re sent to FIG. 0-10. No scrolling through generic categories. The Numerical Index at the end lets you go the other way: have a part number stamped on an old piece? Look it up and it tells you the figure.

Illustration and Text: 154 Pages of Actual Diagrams

The bulk of this catalog—pages P-1 through P-154 under “ILLUSTRATION AND TEXT”—is where the real work happens. Each figure is a clean black-and-white exploded view with callouts. The text box next to each illustration lists the part number, description, quantity, and any notes. For example, FIG. 0-10 shows the cylinder head cover with a breakdown of bolts, grommets, and the oil filler cap. The Figure Number Index lets you jump straight to the assembly you need. If you know the part name but not the figure, use the Illustration Index (pages P-1 to P-16) which lists every illustration by a small thumbnail sketch. That’s faster than flipping blind.

Abbreviation List and Numerical Index

Two sections you’ll use more than you think. The Abbreviation List on page P-14 explains every acronym: “ASSY” for assembly, “BRKT” for bracket, “RH” and “LH” for right and left. It’s one page. The Numerical Index (pages P-1 to P-7) lists every part number in ascending order with the figure and key page. If you’ve got a loose piston ring with a number stamped on it, look it up here. That’s how you verify you’re ordering the correct ring set for a 6WG1 with a specific liner height. I’ve used this index to catch a misboxed part more times than I can remember.

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If your shop does mostly off-road equipment, check out the Automotive Industry Overview”>automotive industry overview for context on how OEM parts catalogs are structured. Also keep a recent Automotive Battery”>automotive battery spec sheet handy when you’re ordering charging system components—this catalog won’t list battery capacities, but it will give you the alternator part number and bracket.

Does this catalog cover the 6WG1 engine for all applications?

Yes. It includes all 6WG1 common-rail variants listed in the Engine Models Table—generator sets, Hitachi excavators, Sumitomo shovels, and general industrial power units.

What kind of part numbers are listed?

Genuine Isuzu OEM part numbers. Each figure shows the exact number, description, and quantity per engine. The Numerical Index makes reverse lookups possible.

Can I use this to identify parts for my 6WG1 in a Hitachi excavator?

Specific Hitachi models like ZX450, ZX650, and ZX850 are listed in the Engine Models Table (page P-4). The catalog includes those applications. Match your ID plate to the correct row—yours is probably XYSA02 or XYSA03. The part numbers for that customer are the same as the Isuzu factory part numbers. Just confirm the production date because some internal components changed during the 2005–2008 window. For example, the fuel injection pump bracket may differ between early and late builds. Use the ID plate date and the illustration to verify before ordering.

Is this the same as the official Isuzu dealer parts catalog?

Yes. This is the official corporate PDF, part number 1-8871-1008-5. It’s the same document the dealer parts counter pulls up. No aftermarket reprint.

You don’t need a subscription or a login to flip through 207 pages. Access the Factory Manual, print the page you need, and tape it to the workbench. That’s how you keep parts ordering from turning into a parts returning problem.