Description

Yanmar TB23R, TB20R, TB23X, TB20X, XTB-6MV1 1996 Parts Catalog

You’ve got a Yanmar engine torn down and a part that’s worn out. You need the right replacement number, not a guess from some third-party site that lists five different possibilities. That’s where this factory parts catalog earns its keep. It’s 42 pages of OEM diagrams pulled straight from the 1996 Yanmar parts system. Not a reprint, not a scan from a copy machine – original factory documentation. I’ve seen too many guys order a camshaft gear using an aftermarket cross-reference and end up with the wrong tooth count. This catalog stops that headache before it starts.

Yanmar TB23R, TB20R, TB23X, TB20X, XTB-6MV1 Parts Catalog: What It Covers

This is a parts catalog, not a service manual. It gives you the factory part numbers and exploded views for the engine family listed on the title page: TB23R, TB20R, TB23X, TB20X, and the XTB-6MV1. The TOC breaks the engine into 17 figures, starting with the cylinder block (Fig 01), then moving through the gear housing, flywheel housing, cylinder head, exhaust manifold, and on through the camshaft, crankshaft, hydraulic pump, oil system, cooling system, radiator, fuel injection pump, governor, injection valve, fuel line, starting motor, generator, and ends with the gasket set (Fig 17). Each figure corresponds to a specific assembly, with callouts linking to the part number list.

Engine Core Sections: Cylinder Block, Camshaft, Crankshaft

If you’re rebuilding the bottom end, you want Fig 01 for the cylinder block and Fig 06 for the crankshaft and piston assembly. The camshaft and its driving gear live in Fig 05. Page 1 gives you the key to reading the catalog: each part has a reference number, a part number, a description, and a quantity column. The ‘Level’ dots show parent-child relationships between assemblies and subassemblies. Interchangeability marks (M, R, N) tell you whether a newer part replaces an older one. Skip studying that page and you’ll order a part that doesn’t fit – I’ve watched it happen. The catalog also includes remarks about optional configurations like compensator type pumps for specific engine variants (4JH-DT, 4JH-DIT, 4JH-DITX) – that level of detail is what separates factory docs from aftermarket guesswork.

What Parts Diagrams Are Included?

Seventeen figures cover every major system. Here’s a quick rundown: Fig 01 Cylinder Block, Fig 02 Gear Housing, Fig 03 Flywheel Housing & Oil Sump, Fig 04 Cylinder Head & Bonnet, Fig 05 Camshaft & Driving Gear, Fig 06 Crankshaft & Piston, Fig 07 Hydraulic Pump, Fig 08 Lube Oil System, Fig 09 Cooling Water System, Fig 10 Radiator & Air Cleaner, Fig 11 Fuel Injection Pump, Fig 12 Governor, Fig 13 Fuel Injection Valve, Fig 14 Fuel Line, Fig 15 Starting Motor, Fig 16 Generator, Fig 17 Gasket Set. That’s everything from the intake to the exhaust, from the sump up to the cylinder head. Need a part number for a fuel injection pump plunger? Fig 11. A water pump gasket? Fig 17. The diagrams are drawn with the same perspective Yanmar used on the assembly line – you can match the bolt orientation to what you see on your bench.

42 Pages of Factory Part Numbers – No Aftermarket Guessing

Forty-two pages. That’s the whole catalog. It starts with instructions on how to read the parts list (page 1) and then dives straight into the exploded views. The part numbers are the ones stamped on Yanmar’s bins – 725995-51920 pump assembly, 129470-51070 packing, 26022-000600 pin. You can order with confidence because the numbers come from the source. The catalog also includes change marks for parts that were revised after the original publication. If you see a star next to a part, it means a design change happened between printings – that’s critical information when you’re trying to match a used engine with a new replacement.

Get the Right Part Number the First Time

Don’t trust aftermarket cross-reference lists for these older Yanmar models. They often mix up TB20R and TB23X parts because the external dimensions are close but the internal specs differ. This catalog lists the engine variant codes right on page 1 – P-TB23REAB for the TB20R/23R. You match your engine’s serial number to the correct variant, then look up the figure. The description column is bilingual (Japanese and English), but the part numbers are universal. Write them down, call your dealer, and you’ll get the correct box. I’ve used this same catalog to source a crankshaft for a TB23X and the keyway difference between that and the TB20R would have been missed by any aftermarket book.

Skip the diagram and order the wrong part? That’s on you.

5 Models Covered in One Catalog

One catalog, five models: TB23R, TB20R, TB23X, TB20X, XTB-6MV1. That saves you from buying separate manuals for each variant. The quantity columns in the parts list are split into six sub-columns (A through F) corresponding to different engine configurations – you’ll see columns for 4JH-DT, 4JH-DIT, etc. The quantity (Q’TY) row at the bottom tells you how many of each part goes into each variant. When you’re working on an XTB-6MV1, you read the ‘F’ column. This kind of detail is why OEM catalogs cost more and are worth every penny. You’re paying for accuracy, not pages.

FAQ

Is this a repair manual or a parts catalog?

Parts catalog. It does not contain step-by-step repair procedures or torque specs.

Does this include torque values for the cylinder head or main bearings?

No. This is a parts catalog, not a service manual. Torque values are found in the factory service manual for your specific Yanmar engine model. That said, having the correct OEM part numbers from this catalog ensures you order the right bolts and gaskets – using the wrong bolt can throw off your torque readings entirely. If you need torque specs, pair this catalog with the Yanmar service manual for the 3TNV76-XTB engine family.

Can I use this for the XTB-6MV1 model?

Yes. The XTB-6MV1 is listed on the title page and has its own quantity column in the parts tables.

What’s the best way to search for a part in this catalog?

Start by identifying your engine variant from page 1. Then find the figure that covers the assembly you’re working on – for example, Fig 05 for the camshaft. Use the exploded diagram to locate the part number, then check the list for that figure. Pay attention to the interchangeability marks (M, R, N) and change marks. If you see a star, the part has been superseded – order the latest version. The remarks column often contains notes about optional parts or application restrictions.

For more on the construction equipment industry standards, see Automotive Industry Overview. Automotive Industry Overview

Related Manuals

• Ammann Yanmar B12 B17 Parts Catalog
• Yanmar YB271, B27 1994 Parts Catalog – OEM Factory Specs
• Yanmar YB301 YB351 1991 Parts Catalog – 248 Pages OEM

This catalog belongs on your bench, not in a drawer. Access the Factory Manual and stop wasting time flipping through aftermarket PDFs that don’t match your engine variant.