Description

Yanmar 4JH-DT, 4JH Parts Catalog

If you’ve ever ordered a part for a 4JH or 4JH-DT and got a box with the wrong injection pump camshaft because the aftermarket catalog had the wrong interchangeability mark, you know why I’m writing this. I’ve seen guys lose half a day because they trusted a third-party parts list that didn’t account for design changes. This Yanmar 4JH-DT, 4JH Parts Catalog runs 223 pages of factory-sourced exploded views, part numbers, and change marks that tell you exactly which part fits which engine serial number range. No guessing.

223 Pages of Factory Parts Data

That page count isn’t filler. The catalog opens with a PREFACE, then moves into SPECIFICATIONS, a PAINTED COLOR LIST, and PAINT PART No. sections. After that you get five PICTURESQUE INDEX sections: MAIN PARTS, HYDRAULIC SECTION, and FIGURE sets covering figures 01 through 94. Every figure is keyed to a parts list with reference numbers, level codes, and effective machine numbers. You want the correct fuel injection pump for a 4JH-D1 with compressor? You find it by cross-referencing the product symbol and engine serial—all laid out in the same format Yanmar uses on their own assembly line.

How Do You Read the Parts Catalog?

This isn’t a generic PDF. The catalog uses a Ref. No. system separate from the illustration callouts, so you have to understand the parent-child relationship indicated by the Level column. “Lev.” 1 means an assembly part, 2 means semi-assembly, 3 means component. Change mark “X” tags parts that were redesigned after the last printing. Interchangeability marks (N, O, R, S, W, Z, K) tell you if a new part swaps with the old one or if you need a whole set. Miss that K marker and you might order one bolt instead of four. The OCR excerpt shows a fuel injection pump listing with screw sizes like M6x16 and part numbers like 128455-51391—that’s the level of detail you get.

Specifications and Painted Color List

If you’re rebuilding or restoring, the SPECIFICATIONS chapter gives the engine parameters you need to confirm you’re matching a particular 4JH variant. The PAINTED COLOR LIST and PAINT PART No. sections let you order exact touch-up paint for the engine block or brackets. That matters when you’re trying to keep a vintage machine looking factory correct.

Fuel Injection Pump: Exploded View Reference

Page 1 of the catalog shows the fuel injection pump (w/ boost) for 4JH-DT models. Part numbers, screw sizes, camshaft (129470-51040), governor roller (129470-51050), retainer (129470-50160). The table lists quantities per variant and even marks which parts are interchangeable. No aftermarket diagram comes close to this level of accuracy.

Trust the Parts List from Yanmar, Not a Copy

Third-party catalogs frequently re-index parts, drop interchangeability marks, or skip the effective machine number columns. That costs you money when the part doesn’t fit. This is an original Yanmar publication—scanned from the factory print, not a re-typed “compatible with” list. The Automotive Industry Overview Automotive Industry Overview shows how OEM documentation supports proper maintenance standards. That’s the same standard this catalog meets.

Check Interchangeability Marks Before Ordering

Symbol “N” means new part, not interchangeable with old. “O” means old part replaced by new, but new works in old applications. “R” means fully interchangeable both ways. “S” means no interchange at all. “Z” means discontinued. Ignore those marks and you’ll be returning parts. The catalog lists effective machine numbers in columns (A) through (F) so you know exactly which engine serial range a part fits. For example, fuel injection pump 128455-51391 applies to multiple 4JH-D1 variants—but only with the correct boost compensator type (E00155). That kind of nuance is lost in aftermarket lists.

Does this catalog include engine serial number ranges?

Yes. Each part listing shows effective machine numbers.

What if I need a part that was discontinued (Z mark)?

The Z mark indicates the part is no longer produced. However, the catalog may list a superseding part number or note that the part is only available as part of a set. For discontinued items, you’ll need to contact a Yanmar dealer with the exact part number from this catalog. Don’t assume a newer number will work—check the interchangeability column first. Some discontinued parts have no direct replacement, so knowing the original number is the only way to search salvage yards or NOS stock. This catalog gives you the data you need to have that conversation without guesswork.

If you need to order parts for a 4JH or 4JH-DT and want to get the right part number the first time, stop trusting aftermarket lists. Access the Factory Manual from AutoRepairManuals and keep it on your workbench.

Related manuals:
Yanmar 4JH-DT Series Engine Parts Catalog 1997
Yanmar TB135 4JH Engine Parts Catalog
Yanmar TL150 4JH Series Engine Parts Catalog
Automotive Industry Overview Automotive Industry Overview