Description

Yanmar 4JH-01T, 4JH-01TY, 4TNV106T-XTBL Parts Catalog

You are in the middle of a rebuild on a 4TNV106T-XTBL, and you need the correct fuel injection pump part number for your serial number range. Without the right parts catalog, you’re ordering blind – that costs time and money. This Yanmar 4JH-01T, 4JH-01TY, 4TNV106T-XTBL Parts Catalog eliminates the guesswork. 46 pages of factory-original diagrams and part numbers, scanned from the actual OEM document. No aftermarket reprints, no third-party confusion.

Cylinder Block and Crankshaft – Fig01 and Fig09

Start with the block. Fig01 lays out the cylinder block assembly with all bolts, liners, and seals. Fig09 covers the crankshaft and piston assembly. You get the exact part numbers for main bearings, thrust washers, and piston rings. Page 1 shows the engine serial number breakdown – 4TNV106T-XTBL S/N 21500628~. That serial number tells you which gear housing (Fig02) and flywheel housing (Fig03) were installed from the factory. If you mismatch those, the oil sump won’t seal. I’ve seen it happen.

Fuel Injection Pump: Serial Number Breakdown

Fig29 is where most people get stuck. The fuel injection pump assembly has two possible part numbers: 725995-51390 and 725995-51291. The difference? The boost compensator type. Page 29 has a remark: “BOOST COMPENSATOR TYPE. OPTIONAL PART TO E/#00155, (4JHAJH-01AH~01TY).” If your engine serial number is E/#00185 or later, you need the -51291 pump. The catalog shows the screw sizes (6×16 and 6×40), the O-ring gasket (122710-51040), and roller bearing (132310-51080). You also get the retainer (129470-51060). That level of detail is what separates a factory parts catalog from a generic list.

Which Yanmar Models Does This Cover?

This catalog covers three engine models: Yanmar 4JH-01T, 4JH-01TY, and 4TNV106T-XTBL. The 4JH-01TY is the same base engine but with a boost compensator as optional. The 4TNV106T-XTBL is a different series – used in construction equipment like compact excavators. All three share many common components: the camshaft (Fig07), the cylinder head and bonnet (Fig04), the cooling water system (Fig12), and the fuel injection valve (Fig14). If you work on any of these, this catalog is the single source for part numbers across the entire engine family.

Read the Parts Catalog Like a Pro

This catalog uses a reference system with levels (LEV.), compatibility codes (N, R, K, S, W, Z, F, Q), and change marks. Page 2 explains the “How to read Parts Catalog” section. Pay attention to the compatibility column. An “N” means the new part is interchangeable with the old one – but not vice versa. An “S” means both directions work. If you ignore those codes, you might order a part that doesn’t fit your serial number range. I’ve seen techs waste a day because they grabbed the wrong pump. Don’t be that guy.

Source: Original OEM Scan, Not Aftermarket

Every page in this access is taken from the official Yanmar Parts Catalog PDF, file name Yanmar_4JH-01T-4JH-01TY-4TNV106T-XTBL_Parts_Catalog_ja-en-25414007450.pdf. That means it includes the original Japanese and English text, factory illustrations, and the exact part numbers Yanmar uses. Aftermarket parts catalogs often renumber or group parts into kits – they lose the granularity. This one keeps every bolt, gasket, and bearing separate. You need a valve from Fig14? You get the part number. A cooling water pump from Fig12? Listed with quantity and reference number. No guesswork.

For a deeper look at how the automotive industry structures service documentation, check out Automotive Industry Overview. And for more Yanmar-specific factory data, browse these related manuals: Ammann Yanmar B12 B17 1991 Parts Catalog – OEM Factory Specs, Yanmar YB271, B27 1994 Parts Catalog – OEM Factory Specs, and Yanmar YB301 YB351 1991 Parts Catalog – 248 Pages OEM. Each of those comes from the same factory source – no aftermarket junk.

Also see Automotive Industry Overview for context on OEM service documentation standards.

Audience Fit: Who Needs This Catalog

If you are a home garage enthusiast rebuilding a Yanmar diesel from a mini-excavator or a generator set, this catalog gives you the part numbers to order seals, gaskets, injectors, and more. For a professional mechanic working on a 4JH-01TY in a boat or a 4TNV106T-XTBL in construction gear, the serial number breakdown saves you from ordering the wrong pump or cylinder kit. The cooling system parts (Fig12) and lubrication lines (Fig10 & Fig11) are critical for a complete overhaul. Without the factory part numbers, you risk using aftermarket equivalents that don’t match torque specs or sealing surfaces.

Is this manual in English?

Yes, it includes both English and Japanese text throughout the part lists and diagrams.

What is the difference between the 4JH-01T and 4JH-01TY in this catalog?

The main difference is the boost compensator type on the fuel injection pump. The catalog shows that the 4JH-01TY models (and some 4JH-01T after E/#00155) use a boost compensator, which changes the pump assembly part number from 725995-51390 to 725995-51291. The remark on page 29 states: “BOOST COMPENSATOR TYPE. OPTIONAL PART TO E/#00155, (4JHAJH-01AH~01TY).” If your engine has a boost compensator, you need the -51291 pump. Also, the valve lash adjustment specs and camshaft (Fig07) are identical, but the cylinder head gasket part number may differ depending on the serial number range.

Access the Factory Manual and get the exact OEM part numbers for your Yanmar 4JH-01T, 4JH-01TY, or 4TNV106T-XTBL engine. 46 pages of factory-sourced data – no aftermarket shortcuts.