Description

Yanmar 3TNC80L Parts Catalog – What You Get When You Buy OEM

I’ve seen too many jobs stop cold because a tech ordered the wrong main bearing or the wrong plug. The guy reads an aftermarket listing that says “fits Yanmar 3TNC80L” and it’s close – but not the same. Then you’re down a bay, customer’s machine is sitting, and you’re eating the cost. That’s why I only spec OEM parts catalogs when I’m rebuilding these small vertical diesels. This Yanmar 3TNC80L Parts Catalog is a factory document – 42 pages of exploded views, part numbers, and quantities. No guesswork.

Parts Breakdown: From Cylinder Block to O-Rings (Page 2)

Page 2 starts with the cylinder block assembly. You get the block itself (part 719809-01560), then plugs – PT1/4, hex plug 12, plug 30, screw plug. Quantities are right there: plug 30 takes six pieces. Then main bearings: standard size and 0.25 OS. Thrust bearings. Camshaft bush. Cylinder head bolt (14 of them), head gasket. Everything is keyed to figure numbers. I’ve seen rebuilds where a guy uses a plug from a different engine and it leaks oil into the coolant. That doesn’t happen when you read the catalog.

Gear Housing Assembly and Oil Seals (Page 4)

Page 4 covers the gear housing assembly. Housing part 719810-01500, oil seal (129795-01800), lube oil supply cap, flange, knock pipes, O-rings for the injection pump. The catalog calls out O-ring sizes: 1A P-16.0, 1A P-32.0, and the F.I. pump O-ring. Bolts are listed with thread size and length – M8x12, M8x16, M8x45, M8x55, M8x85. If you’re assembling this gear case and you use a different bolt length, you can interfere with the gear mesh. I’ve seen it. The factory part numbers remove the margin for error.

Why OEM Part Numbers Matter More Than a Parts Counter Conversation

Aftermarket distributors renumber things. They combine parts that Yanmar lists separately. For example, the main bearing set may come as a kit that includes standard and oversize – but you might only need the 0.25 OS. The catalog gives you each bearing individually. Same with the thrust bearings. Ordering by the factory number (119810-02870 for main bearing US=0.25, 119810-02940 for thrust bearing 0.25 OS) means you get exactly what Yanmar put on the assembly line. That matters when clearance specs are measured in tenths of a millimeter.

Real-World Use: Rebuilding a 3TNC80L in a San Antonio Shop

Last year a customer brought in an Ammann roller with a Yanmar 3TNC80L that had wiped a rod bearing. I pulled the catalog and immediately identified the correct main bearing set and the cylinder head gasket. The head gasket part number is 119812-01330. Without the catalog, I would have measured the old one and guessed at a generic – but the factory gasket has specific crush characteristics. The rebuild went smooth because every part number was locked in before I ordered anything. Related manuals like the Yanmar 3TNC80L Engine Technical Manual give you the torque specs, but this parts catalog gives you the list to get the job done.

42 Pages – Exactly What’s Inside

Forty-two pages. That’s the whole book. No filler. Each page is a parts breakdown with figure numbers, reference lines, and a table of part numbers, descriptions, and quantities. The catalog covers the engine group – ENGINE, SMALL VERTICAL (B), TNC. It’s split into sections: cylinder block, cylinder head, gear housing, flywheel, fuel injection pump, governor, oil pan, and more. Every bolt, plug, seal, and gasket. If you’re rebuilding the entire long block, you’ll page through every sheet and build a complete order list. If you’re just replacing a blown oil seal, you flip to page 4, find the O-ring, and order it.

Source Authenticity: Factory Yanmar, Not a Third-Party Scan

This is a direct scan of the official Yanmar parts catalog. The Japanese and English text are both present. You see the original engineering part numbers – not re-drawn or renumbered. Aftermarket catalogs often consolidate parts into “universal” listings. That leads to ordering a bolt that’s too short or a seal that’s the wrong durometer. I’ve had to walk a junior tech through a job where he installed a non-OEM oil seal and it leaked within 200 hours. The factory stuff works. Period. If you need the service repair procedures, see the Ammann Yanmar B12 B17 Parts Catalog or the Yanmar YB271, B27 1994 Parts Catalog – OEM Factory Specs for related machines.

The Automotive Industry Overview often talks about standardization – but in the small engine world, OEM part numbers are the only standard that matters. Another overview on Automotive Industry Overview covers similar ground.

FAQ – Four Common Questions

Does this parts catalog include torque specifications?

No. This is a parts catalog, not a service manual. It tells you what parts go where, not how tight to turn them.

Can I use this to order parts for a 3TNC80L that has been modified?

If the engine has been altered with non-Yanmar components, the part numbers here won’t match. The catalog covers only factory original configuration. For example, if someone swapped the injection pump to a different brand, the O-ring and mounting bolts listed here won’t apply. You’ll need to cross-reference the pump itself. The catalog is designed for stock engine rebuilds and maintenance. Modifications require additional research and measurement. I always recommend starting with the OEM parts list and only deviating when you have verified dimensions and clearances on the modified components.

How do I find the part number for the cylinder head gasket?

Page 2. Look for line 22 under the cylinder block section. Part number 119812-01330. Quantity: 1.

Is this a direct access or a hard copy?

Digital PDF format after purchase. You get the full 42 pages.

If you’re rebuilding a Yanmar 3TNC80L, start with the right list. Don’t guess part numbers. Don’t trust an aftermarket “equivalent” sheet. Get the factory breakdown and order exactly what’s on the page. Access the Factory Manual now.