Description

Yanmar TN65M-5A, TN70M-5A, TN78M-5GA, TN78M-5QA Parts Catalog

You need a cylinder block gasket set for a TN78M-5QA. You pull up a generic parts website, and they show a picture with no clear part number. You order what looks right. It doesn’t fit. You lose a day and pay return shipping. That’s the cost of using aftermarket garbage instead of an OEM Yanmar TN65M-5A, TN70M-5A, TN78M-5GA, TN78M-5QA Parts Catalog. This is a factory-issued 28-page parts catalog, not a third-party reprint. Every number matches what Yanmar stamped on the casting. I’ve seen too many DIY guys burn money on wrong parts because they skipped this step.

Parts Breakdown by System

This catalog organizes every component into figure-based sections. Page 1 gives you the cylinder block assembly with 25 numbered parts — from the block assembly (part 119260-01840) down to main bearing inserts. Each figure lists the exact quantities per variant: TN65M-5A, TN70M-5A, TN78M-5GA, TN78M-5QA. You see a bolt M10 x 60 plated (23130-01800) and you know it’s used on all four models. That kind of cross-reference eliminates the guesswork. On page 2 the gear housing section adds cover assemblies, O-rings, and dowel pins. The catalog uses (A)–(F) columns to tell you which parts belong to which sub-model. If your machine has a serial number starting with 6CR1G-G45101, you’re looking at the right page.

Does This Catalog Cover All Four Models?

It covers the Yanmar TN65M-5A, TN70M-5A, TN78M-5GA, and TN78M-5QA. Each figure has lettered columns — (A) through (F) for TN65M-5A, (G)–(I) for TN70M-5A, and so on. You can order the identical part for any of these tractors as long as the column shows the same quantity. That’s how OEM catalogs work. No aftermarket consolidation that lumps all models into one vague list.

3 Reasons to Use OEM Parts Catalogs

Aftermarket parts catalogs rely on outdated scans and often mix up supersessions. Here is why you want the factory print:
1. Every part number is direct from Yanmar’s engineering department, not a third-party database that may be wrong.
2. Exploded diagrams show you exactly where the gasket, seal, or bolt sits — no need to guess orientation.
3. The 28-page length keeps it focused; you don’t waste time flipping through irrelevant models.

Cylinder Block Assembly: Page 1 Content

Look at the detail on page 1. The block assembly part number 119260-01840 is listed for all four models. You also get thrust bearings (119270-01860), main bearing loose 25 (119290-02070), and a gasket set for the cylinder head. Each item has a reference number, level, and quantity. If you need an under-size bearing (U=0.25), the remarks column tells you. That kind of information is absent from generic catalogs. When you rebuild an engine, you need to know whether the block takes a 10 mm plug or a 20 mm plug. This catalog gives you both part numbers: 212241-03000 for the 20 mm plug and 119264-01840 for the 10 mm plug. Don’t guess — pull the part number from here.

Get the Right Part Numbers

Ordering parts from an OEM catalog means you hand the dealer a number like 119260-01840 and they hand you the correct box. No returns. No second guessing. The catalog also includes hardware details — bolt lengths, stud dimensions, O-ring sizes (1A 12.5, 1A 16, etc.). You can rebuild an entire gear housing using only figure 2 on page 2. The gear box assembly part (119280-01450) comes with its own O-rings and dowel pins. Everything is listed by quantity per model. If you need a pin dowel 9×12 (24311-09000), you know it’s used twice on every TN65M-5A. Automotive Industry Overview That link gives broader context on OEM vs aftermarket in heavy equipment, but the takeaway is simple: factory data eliminates parts ordering mistakes. Automotive Industry Overview

FAQ

Can I use this catalog for a TN70M-5A that has a different serial number?

The catalog covers all four models listed in the title. If your serial number matches the prefix 6CR1G-G45101, you’re good. Otherwise, check the figure columns.

Does it include torque specs?

Nope.

How many pages are in the PDF?

28 pages. That’s concise — every page has an exploded diagram and parts list. No filler.

What if a part number is marked as ‘N’ or ‘R’ in the catalog?

‘N’ means not applicable to that specific column. ‘R’ indicates the part is referenced from another figure. The remarks column clarifies under-size bearings or optional hardware. You still get the exact part number from the master list — cross-reference it with the figure number. For example, on page 2, item 16 is marked (A-EXXX)(B-EXXX) etc. Those are supersession numbers that you can look up in Yanmar’s latest parts system. The catalog is the starting point; always verify availability with your dealer using the printed number.

Related Manuals

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

If you are rebuilding a Yanmar TN-series engine or just replacing a leaking gasket, this catalog is your ticket to ordering the right piece. Don’t rely on third-party reprints that blur out part numbers. Access the Factory Manual and keep it on your tablet while you pull the old part. You’ll match the number in the diagram before you place an order. That’s how you avoid the two-week wait for the wrong bolt.