Description

Yanmar 4JH-DT, 4JH-DT1, 4TNV88C 1997 Parts Catalog

You ever order a part for a Yanmar marine or industrial engine, wait three days, open the box, and find out it’s the wrong one? That’s because you trusted a third-party cross-reference or a worn-out parts list. This 1997 Yanmar 4JH-DT, 4JH-DT1, 4TNV88C 1997 Parts Catalog is the factory document – 48 pages of exploded diagrams, OEM part numbers, and compatibility notes straight from Yanmar. No guesswork. No “this should fit.” You get the exact numbers for the cylinder block, fuel injection pump, and every seal in between.

I’ve been turning wrenches for 28 years, and I can tell you the difference between a shop that uses OEM parts catalogs and one that doesn’t. The first one finishes the job on time. The second one makes three trips to the parts counter. This catalog is for the first kind of mechanic – whether you’re pulling a 4JH-DT1 out of a sailboat or rebuilding a 4TNV88C in a generator set. Don’t waste your time on aftermarket lists that leave out critical details like the boost compensator injector pump variation.

Cylinder Block & Head – Finding the Right Part Number

Flip to Fig. 1 and Fig. 4. You get the cylinder block assembly and the cylinder head & bonnet in separate exploded views. Each callout has a ref. no., a part number, and a description. For the 4JH-DT and 4JH-DT1, some parts differ – the catalog lists qty differences right in the table. Page 3 shows the full layout of how to read the reference numbers, including compatibility symbols (N, Q, S, R, W, Z, F, K). That’s the kind of detail you need when a head gasket is superseded and the old number is obsolete. You don’t guess; you look up the symbol and know exactly what replaces it.

Fuel Injection Pump – Figure 29 Breakdown

Fuel system work is not the place to improvise. The 4JH-DT and 4JH-DT1 both use a mechanical fuel injection pump with a boost compensator. On page 2 of the catalog (you’ll see the Japanese and English headers), Figure 29 lists the entire pump assembly – part number 799995-51390 for the main pump, plus the camshaft, roller bearing, retainer, screws, and washers. Each line shows qty for both engine models. If you need the boost compensator option, the remarks section tells you it’s optional up to engine number E/#00155. You won’t find that note in an aftermarket catalog because the aftermarket doesn’t track Yanmar’s running changes.

Related manuals you should keep on the same bench: Yanmar 4JH-DT Series Engine Parts Catalog 1997 and Yanmar TL150 4JH Series Engine Parts Catalog. Both cover overlapping driveline components. Also check the Yanmar 4JH-DT 4JH-DTZ 1997 Parts Catalog for the DTZ variant differences.

How to Read the Japanese – Translation Notes

The catalog is bilingual – Japanese on the left, English on the right. The front matter explains the interpretation of the reference number system, level marks (parentheses showing parent-child part relationships), and the change mark “I” for new revisions. You don’t need to read Japanese to use it; the part numbers are numeric, and the English column gives the description. But knowing that “燃料噴射ポンプ” means “fuel injection pump” saves time. Page 1 has the full legend for compatibility symbols and machine number columns (A–F). For example, (A-E/#00185) means the change applies to 4JH-DT engines from engine number 00185 onward. That’s a critical detail if you’re ordering parts for a 1997 engine with a serial number close to that cut-off.

Does This Catalog Cover Every System?

Yes – all major systems are broken down into 20 figures. From the cylinder block (Fig. 1) to the gasket set & tools (Fig. 20). You get the gear housing, flywheel housing & oil sump, suction manifold & air cleaner, exhaust manifold, diesel particulate filter (two figures), camshaft & driving gear, crankshaft & piston, lubrication oil system, cooling water system, fuel supply pump, fuel injection valve, fuel pipe, starting motor, generator, ECU, electric parts, and the gasket set. Every figure gives a clear exploded illustration and a parts list. The 48 pages are dense with information – no padding.

Source Validity: OEM vs Aftermarket Catalogs

This is a Yanmar factory publication from 1997, stamped with the document number P-TB240_GEOA. It’s not a reprint of a reprint. The part numbers are the same ones Yanmar dealers use. Aftermarket catalogs often cross-reference parts incorrectly – for example, a fuel injection pump for a 4JH-DT might get swapped to a 4JH-DT1 without noting the boost compensator difference. This catalog lists both engine models in each table and marks quantity differences clearly. If you’re rebuilding a 4TNV88C-STB or STB1, the catalog title explicitly includes those models. An aftermarket catalog would never break out the DPF figures (Fig. 7 and 8) separately because they’re not common in generic listings. Trust the factory source. The Automotive Industry Overview page on Wikipedia explains why OEM specifications matter for safety and reliability – the same principle applies here.

FAQ

Can I use this catalog to order parts for a 1998 Yanmar 4JH-DT engine?

No.

What if I need a part number for the fuel injection pump on a 4JH-DT1 with the boost compensator option?

The catalog lists the boost compensator type in the remarks section of Figure 29. The base pump part number is 799995-51390, but if your engine serial number is E/#00155 or below, the boost compensator was optional. You need to match your engine number against the (A-E/#00185) column to confirm whether the part applies. The catalog also includes the camshaft and retainer part numbers separately – 122710-51540 and 129470-51060 respectively. For the 4JH-DT1, the same numbers apply, but check the qty column – some screws and washers show 9 for both models, but the washer row may have 0 qty depending on revision. Cross-reference the revision column (Rev) to see if your engine falls within an older build range. If you’re still uncertain, contact a Yanmar dealer with your engine serial and this catalog open to Figure 29 – they’ll confirm.

That’s the difference between owning a factory parts catalog and relying on a web search. You get the actual revision history and compatibility notes that prevent ordering the wrong fuel pump. If you’re serious about keeping your 4JH-DT, 4JH-DT1, or 4TNV88C running with the right parts, this is the document you need. Access the Factory Manual now and put it on your tablet or print it out – every time you open it, you’ll save yourself one parts-counter headache.