Description

Yanmar 4JH-DT21, 4JH-DT23, 4JH-DT24, 4JH-DT27, 4JH-DT35 1997 Parts Catalog

If you’ve ever ordered a part for a Yanmar 4JH-DT21, 4JH-DT23, 4JH-DT24, 4JH-DT27, 4JH-DT35 1997 Parts Catalog engine from an aftermarket source and ended up with the wrong injector or a gasket that didn’t match, you know exactly what I’m talking about. That wasted trip to the parts counter, the second phone call, the return shipping. I deal with that mess every week in my shop. This is the real deal – the original 1997 Yanmar factory parts catalog, 140 pages, printed in Japan. Every exploded diagram, every parts number, every supersession note comes straight from the engineer who designed the engine. No third-party reinterpretation. You want the correct piston ring set for a 4JH-DT27? This catalog shows it.

Why a Factory Parts Catalog Beats Aftermarket Every Time

Aftermarket catalogs often merge part numbers across models or leave out critical revisions. This manual tracks every change with compatibility symbols – N, R, K, W, Z – explained right on the first page. When an old part gets superseded, the book flags it with an “I” mark. You won’t find that in a third-party reprint. If you’re rebuilding a 4JH-DT24 and need the exact fuel injection pump for boost-compensator version, the exploded view on the fuel injection pump page gives you the part number. No guesswork.

What This 140-Page Catalog Covers for Your Yanmar 4JH Engine

The catalog splits into three engine variants: 4TNE98-TB, 4TNE98-TBA, and 4TNV98-WTB. Each section runs through the entire engine from the cylinder block to the generator. You get full coverage of the cylinder head and bonnet, suction and exhaust manifolds, camshaft and driving gear, crankshaft and piston assembly, lubrication and cooling water systems, fuel injection pump with inner parts breakdown, governor (including inner parts), fuel injection valve, fuel line, engine stop device, starting motor, generator, and a complete gasket set. Every section has its own numerical index so you can cross-reference part numbers fast. That’s the kind of documentation that keeps a rebuild moving instead of stalled for a week.

Cylinder Block, Crankshaft, and Camshaft – Exploded Views and OEM Numbers

When you’re tearing down a 4JH-DT23 to the short block, you need the exact main bearing cap bolts and thrust washers. The cylinder block section lays out every component with reference numbers tied to the parts list. The camshaft and driving gear page includes timing gears and thrust plates. The crankshaft and piston section covers rods, pins, rings, and bearings. I’ve seen guys try to match parts by eye – don’t. Use the factory illustration. The part numbers are stamped right there. Order once, get it right.

Fuel System: Injection Pump, Valves, and Lines – Exact OEM References

For the 4JH-DT35 and other models, the fuel injection pump section includes both the standard and boost-compensator versions. The OCR excerpt shows the pump part numbers 759995-51990 and 759995-51990 (yes, two different variants), along with screws, packing, and retainer. It even breaks out the inner parts of the pump and governor separately. If your 4JH-DT27 has the compensator type, the manual notes that up to engine number E/#00155 it was an optional part. That kind of serial-number cut-in detail is what saves you from ordering the wrong throttle linkage. Fuel injection valve and fuel line diagrams are also included, with all washers and clips identified.

Does This Manual Cover the 4TNE98-TB and 4TNV98-WTB Variants?

Yes. Each variant gets its own table of contents. The 4TNE98-TB section runs 18 chapters from cylinder block through gasket set and numerical index. The 4TNE98-TBA version is nearly identical but drops the governor inner parts and adds an engine stop device chapter. The 4TNV98-WTB includes separate sections for fuel injection pump inner parts and governor inner parts – a must if you’re working on a newer indirect-injection model. All three are in this single catalog. You get 140 pages of OEM data, not 50 pages of generic drawings copied from who-knows-what.

Use the Numerical Index to Find Parts Fast

Behind every engine section is a numerical index that lists every part number in ascending order with page reference. No flipping through 140 pages hoping to spot the part. Look up the number, find the figure, verify the illustration. That’s factory efficiency. I keep a copy of this on my tablet and a printed backup in my toolbox. If you’re a DIY owner working on a boat or generator set, this catalog pays for itself the first time you avoid a wrong part order.

Can I use this catalog for a 4JH-DT21 with a different serial number range?

Yes. The catalog includes serial number breakpoints for each model.

How do I read the compatibility symbols (N, R, K) in the parts list?

The manual explains every symbol on page 1. For example, N means new part is interchangeable with old one-way (old to new only), R means both directions, K means only the quantity changed. W indicates a newly added part, Z a discontinued one. If you see an “I” mark next to a part, that means it was changed since the last printing – critical info when ordering. The symbol chart also covers F (only the count changed). Missing that nuance leads to ordering the wrong quantity of gaskets or seals. For instance, the fuel injection pump page shows two different part numbers for the same pump – the symbol tells you which one applies to your engine serial number. Always check the level dots (parent-child relationships) to know if you need the sub-component or the assembly. This catalog is dense, but the legend makes it readable.

Look at related manuals from our collection: Ammann Yanmar B12 B17 1991 Parts Catalog – OEM Factory Specs and Yanmar YB271, B27 1994 Parts Catalog – OEM Factory Specs also Yanmar YB301 YB351 1991 Parts Catalog – 248 Pages OEM. For a broader perspective on the industry, see Automotive Industry Overview. You can also read more at Automotive Industry Overview. If you want to stop wasting time on parts that don’t fit, Access the Factory Manual and keep it in your shop.