Description

Yanmar 4JH-DT, 4JH-DTZ, 4JH-DTZP, 4JH-DTZA, 4JH-DTZY Parts Catalog

Hands off the aftermarket parts catalogs. If you’re rebuilding a Yanmar 4JH-DT, 4JH-DTZ, 4JH-DTZP, 4JH-DTZA, 4JH-DTZY Parts Catalog is what you need. I’ve watched techs order the wrong fuel injection pump because some third-party list had a superseded number. That costs hours and money. This factory document runs 173 pages – exploded views, OEM part numbers, interchangeability marks. Nothing generic.

How to Read This Parts Catalog

Page 2 lays out the level system and interchangeability symbols. Level 1 is a parent assembly, Level 2 is a child part inside it, Level 3 a grandchild. Symbols like N, Q, R, S, W, Z, F, K tell you exactly how a part change affects interchangeability. You need this when ordering a fuel injection pump for the 4JH-DTZ. Without it, you might buy a part that doesn’t fit the serial number range.

Wiring Diagram and Painted Color Sections

This catalog includes a dedicated WIRING DIAGRAM chapter and VEHICLE PAINTED COLOR information. If you’re tracing a harness or matching paint codes during a rebuild, having the factory wire colors and paint references avoids expensive rework. Aftermarket catalogs often skip these.

7 Figure Sheets in the Picturesque Index

The PICTURESQUE INDEX (3) splits into seven figure sheets – 1/7 through 7/7. Each sheet shows an exploded view of a subsystem. Combine that with the MAIN PARTS index and the HYDRAULIC SECTION index, and you can visually confirm every component down to the last O-ring. No guesswork about which bracket goes where.

Understand Interchangeability Marks Before Ordering

Interchangeability marks are not optional. N means old part interchanges into new but not reverse. Q means new interchanges into old but not reverse. R means both ways. S means not interchangeable. W is a new part, Z discontinued, F interchangeable only as a set, K quantity changed. One misread – you order a 4JH-DTZA part that won’t fit your 4JH-DTZY. Page 2 spells it out clearly.

What Do Effective Machine Numbers Mean?

Columns (A) through (F) correspond to each model variant: (A)=4JH-DT, (B)=4JH-DTZ, (C)=4JH-DTZP, (D)=4JH-DTZA, (E)=4JH-DTZY. The effective machine number tells you from which serial number the part change applies. For example, (A=E/#00185) means the change is effective for 4JH-DT from engine serial 00185 onward. Use this to cross-check your engine plate.

For context on why factory documentation matters across the Automotive Industry Overview, consider that aftermarket catalogs often omit interchangeability notes. The Automotive Industry Overview highlights the importance of original specifications when repairing complex machinery.

Does this Parts Catalog include torque specifications?

No. This is a parts catalog, not a service manual. For torque specs, get the factory service manual.

How do I find the correct part for my 4JH-DTZP if the number changed?

Look up the part in the catalog, note the interchangeability mark in the column for 4JH-DTZP (C). If the mark is N, the old part can be replaced by the new number but not vice versa. Check the effective machine number – if your engine serial is after the change point, use the new number. If it’s before, the old number still applies. Also verify the column (C) entry for your specific model.

Are wiring diagrams included in this manual?

Yes. The WIRING DIAGRAM section is included in this 173-page catalog.

What is the difference between Level 1, 2, and 3 parts?

Level 1 is a parent assembly (e.g., a complete injection pump), Level 2 are child components inside that assembly (e.g., plunger and barrel), Level 3 are grandchild parts (e.g., springs inside the plunger). Use the level to navigate the parts list hierarchy.

If you’re serious about rebuilding any of these Yanmar 4JH engines without ordering the wrong parts, get this catalog on your bench. Access the Factory Manual now and start cross-referencing part numbers against the actual machine serial numbers.

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