Description

Yanmar 4JH-DT, 4JH-DTY, TL150, 4JH-DTF 1997 Parts Catalog

I’ve seen it happen twice this month alone. A tech orders a fuel injection pump for a 4JH-DTY, gets one for a 4JH-DT, and the engine sits for three days because the boost compensator bracket doesn’t line up. That’s billable hours down the drain, and a customer who thinks you don’t know what you’re doing. Yanmar 4JH-DT, 4JH-DTY, TL150, 4JH-DTF 1997 Parts Catalog stops that nonsense cold. This is an original factory PDF – not a third-party recompile, not a photocopy of a photocopy. It’s 44 pages of OEM exploded diagrams, part numbers, and application codes that tell you exactly which screw, which washer, which pump assembly fits your specific engine serial number range. The OCR excerpt from page 2 shows the format: each figure has a reference number, a Yanmar part number, a description, and a quantity column with compatibility marks (A, B, C, D, E) for the different models. If you’ve ever had to cross-reference a part number from a generic catalog that claims to cover “all Yanmar 4-cylinder diesels,” you know how much time that wastes. This is the real thing.

What You Get in These 44 Pages

The table of contents reads like a checklist of every major engine system. Cylinder block, gear housing, flywheel housing and oil sump, cylinder head and bonnet, suction manifold and air cleaner, exhaust manifold and silencer, camshaft and driving gear, turbine, crankshaft and piston, lubrication oil system and line, cooling water system, fuel injection pump, fuel injection valve, fuel line, engine stop device, starting motor, generator, and a gasket set section. That’s 19 separate exploded-view drawings, each keyed to a parts index at the back. Every part number in those drawings is tied to a specific model – 4JH-DT, 4JH-DTY, TL150, or 4JH-DTF – and sometimes to a serial number range. If you’re rebuilding a 4JH-DT and need a camshaft, you turn to the camshaft and driving gear section, find the figure, and read the part number straight off. No guesswork, no calling the dealer to ask if the cam is the same between a DT and a DTY. It’s printed right there.

CYLINDER HEAD & BONNET – Why You Need the Right Valve Parts

Valve train components get swapped between models all the time. A valve from a 4JH-DTF might have a different stem diameter than one from a 4JH-DTY. The cylinder head section in this catalog shows every part in the head – valves, guides, seats, springs, retainers, and the bonnet assembly. Each part number is followed by a compatibility code. You see a “K” next to a screw? That means the quantity changed between revisions. The catalog notes these changes with a level system and compatibility symbols (N, Q, R, etc.). That’s the kind of detail you need when you’re ordering head parts for a TL150 that’s been rebuilt before. Without the factory diagram, you might order six head bolts when you need eight, or the wrong length. Page 2 of the OCR excerpt shows how the catalog uses reference numbers and part numbers in a table – that same structure runs through every section. If you can read a parts list, you can order exactly what the engine needs.

FUEL INJECTION PUMP (W/BOOST) – Not a Guess-the-Part Game

The fuel injection pump section is one of the most detailed in the catalog. Look at the OCR excerpt from page 2: part number 725695-5190 is listed for both the 4JH-DTY and 4JH-DTF fuel injection pump assemblies. But the column shows a “(A)” next to the DTF version, and there’s a remark about the boost compensator type. The catalog specifies that the boost compensator is optional up to engine number E/#00155 for the 4JH-DT and 4JH-DTY. That means if your engine serial is after 00155, the boost pump is standard. A generic catalog won’t tell you that – it’ll just list one pump for all, and you’ll end up with a pump that either lacks the boost line or has an extra port you don’t need. This manual also covers the fuel injection valve, fuel line, and engine stop device sections. Every banjo bolt, every return line clip, every injection nozzle is listed with a Yanmar part number. If you’re swapping a fuel system on a TL150, you need this catalog open on your bench.

CAMSHAFT & DRIVING GEAR – Matching Serial Numbers

Camshaft gear failure on a 4JH-DT is not rare. The catalog shows the camshaft and the driving gear as separate items, each with its own part number. But here’s the catch – the gear might be shared between models, or it might be unique to a particular serial range. The catalog header for the entire document reads “Engine for TL150 4TNE106T-TBL S/N 21500004-21500627”. That serial range tells you exactly which TL150 engines this catalog covers. If your engine falls outside that range, you need to check the compatibility codes or look for a later edition. The camshaft section also includes the timing gear and any spacers or keys. One misordered gear and the timing is off, the engine won’t start, and you’re tearing it back down. This catalog eliminates that risk.

Match Your Engine Serial Number Before Ordering

Before you click “buy” on any part, open this catalog and find your model code. The document covers 4JH-DT (code A), 4JH-DTF (code B), 4JH-DT (code C – note there are two DT entries, possibly different specs), and 4JH-DTY (codes D and E). Each figure uses those codes in a matrix column so you can see if a part applies to your engine. The catalog was published September 1, 1997 – printed in English and Japanese, with the English “How to read this Parts Catalog” section on page 2. That section explains the compatibility symbols (N, Q, R, S, W, Z, F, K) and the implementation numbers (A through F) that tell you when a part change took effect. If you’re serious about keeping a Yanmar engine running without chasing parts from three different suppliers, this is the document that pays for itself on the first order.

Factory Source vs. Aftermarket Copies

I keep a stack of aftermarket parts catalogs in the corner of my shop. They’re useful for getting a rough idea, but I never use them to order parts. Why? Because they often consolidate multiple model years into one drawing and leave out the serial number break points. The Yanmar factory catalog is the original PDF used by Yanmar dealers. It’s not a third-party “reproduction” – it’s the same file a Yanmar parts counter would pull up. The OCR excerpt shows the official Yanmar logo and the part number scheme. No aftermarket catalog includes the compatibility level marks or the implementation number notes. If you’re working on a TL150 backhoe or a marine auxiliary engine with a 4JH-DTY, you need the factory document. Related manuals you might also want: Yanmar 4JH-DT Series Engine Parts Catalog 1997, Yanmar 4JH-DT 4JH-DTZ 1997 Parts Catalog, Yanmar Engine 4JH-DT Parts Catalog. For a broader understanding of why OEM documentation matters in heavy equipment, see this Automotive Industry Overview. Or the same Automotive Industry Overview for context.

Frequently Asked Questions

Can I use this catalog for my 4JH-DT engine if I have a different serial number?

Only if your engine falls within the covered serial range. Check the header on page 1.

Does this include part numbers for the fuel injection pump with boost compensator?

Yes. The fuel injection pump section (page 2 of the OCR excerpt) lists pump assembly 725695-5190 for both 4JH-DTY and 4JH-DTF, with a note that the boost compensator is optional up to engine number E/#00155. After that serial, the boost pump is standard. The catalog includes separate part numbers for the boost compensator components and the screws, washers, and bearings that go with it. You also get the fuel injection valve and fuel line sections with all associated hardware. If you’re troubleshooting a hard-start issue related to the fuel system, this section alone can save you hours of head-scratching because you can verify you have the right injection pump for your model and serial number.

Is this catalog printed in English?

Yes. Page 2 is the English “How to read this Parts Catalog” section. The Japanese side-by-side translation is also included. All part numbers, descriptions, and quantity columns are in English.

How many pages and what sections are included?

44 pages covering cylinder block, camshaft, crankshaft, cooling, fuel, valve, and every other engine system listed in the TOC.

If you’ve ever had a $600 fuel pump arrive and not fit because the mounting flange was 3mm off, you understand why I don’t trust anything but the factory document. This is the PDF that Yanmar issued in 1997 for the TL150 and 4JH series engines. It’s not a reprint, not a scan with missing pages – it’s the original 44-page file. Access the Factory Manual and put it on your shop tablet. Next time you tear down a 4JH-DT, you’ll have the exploded diagram and part number for every cylinder, every camshaft journal, every cooling system hose. That’s what this catalog is for.