Description

Yanmar Y00BS260 Technical Manual – Parts & Assembly Data

I’ve seen too many guys throw a head gasket on a small diesel because they guessed the bolt sequence. On a Yanmar Y00BS260, guesswork costs you a block. That’s why you need the actual Yanmar Y00BS260 Technical Manual – 32 pages of factory data pulled straight from the OEM parts catalog and assembly prints. This isn’t a third-party rewrite. It’s the same document the dealer tech uses. Page 2 gives you the full cylinder block parts breakdown – part numbers, bolt sizes, plug specs. You don’t have to wonder if M6x12 is right. It’s listed.

32 Pages – What You Get in This Yanmar Y00BS260 Technical Manual

32 pages might not sound like a lot, but every page is packed with OEM parts diagrams and exploded views. You get the cylinder block assembly (page 2), gear case cover, hydraulic pump section, and all the fasteners with Yanmar part numbers. No wasted space. The manual is organized by assembly – Block, Gear Housing, Pump – so you can jump straight to the part you’re replacing.

Engine Assembly Breakdown: Cylinder Block and Gear Housing

The manual breaks down the engine into two major sections. First, the cylinder block assembly – that includes main bearings (part 719260-02800), thrust bearings, camshaft bush, and the cylinder head gasket (part 119265-01340). Then the gear housing assembly with the gear case cover, oil seal (HTC456208), and shim set. Each component is keyed to a figure number so you don’t lose your place. If you need the hydraulic pump mounting, that’s in the pump section.

Does the Manual Cover the Hydraulic Pump?

Yes. The manual includes a dedicated parts listing for the hydraulic pump (page 4, item 34: PUMP,HYDRAULIC). That’s critical if you’re rebuilding the pump or chasing a pressure leak. The manual gives you the OEM part number and location in the assembly. You won’t find aftermarket substitute specs here – this is what Yanmar specified for the Y00BS260.

Factory Specs vs. Aftermarket: Why OEM Matters

Aftermarket manuals love to tell you a generic torque value for a ‘small diesel.’ That’s how you strip a 6×10 plug or snap a head bolt. The Y00BS260 manual lists exact Yanmar part numbers – like 27221-060100 for the plug 6×10 – so you order the right fastener and use the correct tightening sequence. I keep a copy on my workbench because I’ve been burned by bad data. Ammann Yanmar B15-37, B17-3, B18 Technical Manual – OEM Factory Specs follows the same philosophy: no shortcuts, only factory prints.

Check the Cylinder Head Bolt Part Numbers (Page 2)

Page 2 lists 14 cylinder head bolts (part 119260-01200) and the head gasket. If you’re doing a head job, you need those numbers. Also note the undersized main bearings (.25US) listed as service parts. The manual marks which parts are undersized so you don’t mix them up. Always verify your parts against this list before you start torquing. Yanmar 2TE67L-BV, SV08-1 Technical Manual – 58-Page Factory Spec Guide covers a similar engine family if you’re working on those models.

FAQ

Can I use this manual for a Y00BS260 with a different engine code?

No. This manual is specific to the Y00BS260 with 3TNE68L-UBC(B19) engine code. Other variants may have different part numbers.

What does the manual include besides parts diagrams?

The manual includes a complete illustrated parts catalog with Yanmar part numbers for every component in the cylinder block, gear housing, and hydraulic pump assemblies. It also lists fastener sizes, O-ring specs (like 1A P-12.0 and 1A P-32.0), gasket materials (non-asbestos), and undersized bearing options. While it does not include step-by-step removal procedures, it gives you the exact data you need to order the right parts and confirm assembly. If you’re rebuilding the engine, combine this with a factory service manual for torque sequences.

When you’re laying a head gasket on a Y00BS260, you don’t want to guess which plug goes where. You want the factory print. That’s what this 32-page technical manual gives you. Yanmar EF-494T 2011 Technical Manual – Factory Torque Specs is another diesel option if your work goes that way. For external reference on manual transmissions, check Manual Transmission and Manual Transmission, but for the engine itself, stick with Yanmar’s own data. Access the Factory Manual and get it on your bench.