Description

Yanmar 3TNES82A Technical Manual

If you’re pulling a Yanmar 3TNES82A engine apart and relying on a generic aftermarket PDF, stop now. I’ve seen guys snap head bolts because they guessed on torque specs. This Technical Manual is the OEM factory print – 34 pages of the exact data Yanmar stamped into the parts. No translation errors, no missing bolt callouts. You get the cylinder block assembly with part numbers like 719813-01560, main bearing US=0.25 oversize clearance, and the gear housing seal specs. Page 2 is where the block assy lives. I’ve used these manuals for years in my San Antonio shop. They save you from calling a customer and saying “sorry, I need another block.”

Engine Block and Cylinder Head Procedures

The manual breaks down the cylinder block assembly (page 2) into individual components: plug PT1/4, plug 12, plug 30, camshaft bush 129795-02411, thrust bearing 119810-02940. You get bolt part numbers and quantities – 14 cylinder head bolts (119810-01200) and the head gasket (119812-01330). No guessing on fastener grades. The OCR shows main bearing US=0.25 and thrust bearing 0.25 OS, which means you can order oversize bearings without pulling the crank twice. That’s the difference between a weekend job and a three-day headache. For torque specs, you’ll need to cross-reference the diagram callouts – the manual uses Figure references for bolt torque patterns. I always mark those before I disassemble.

Gear Housing Assembly – Seals and O-Rings

Gear housing assy (page 4) lists the oil seal 129795-01800, stud M8x22, filler cover, and O-rings for the injection pump (121850-51960) and various P-series sizes. Pay attention to O-ring 1A P-32.0 (24311-000320) – it appears twice on that page. If you lose one, the housing leaks oil and you’re pulling the whole front cover again. The manual also specifies plated bolts: M8x12, M8x16, M8x20, M8x45, M8x55, and M8x85. Some have seal washers (22190-080002). Don’t reuse those washers. Replace them. I keep a box in my toolbox because they’re cheap and stop leaks dead.

7 Systems Covered Across 34 Pages

This Technical Manual covers the engine block assembly, cylinder head and gasket, gear housing with front cover, oil pan, timing gear train, fuel injection components (injectors and pump mounting), and the lubrication system. Each system is broken into exploded diagrams with callout numbers that match the parts list. You get bolt lengths and plating specs, interference fits (like the camshaft bush) and main bearing clearances. For example, the main bearing US=0.25 is listed twice – once for standard, once for oversize. That tells you the factory expects you to measure and select. A manual that doesn’t give you oversize data is worthless. This one does.

OEM Documentation vs Aftermarket – Why It Matters

I’ve bought too many aftermarket “complete” manuals that skip the gear housing blind cover (121023-01550) or use generic bolt torque values. Yanmar’s own print has the PCN number CYQB7100 and part numbers like 719813-01560. That’s traceable. If I call Yanmar and ask for that block assy, they know the exact supersession. The gear housing page even includes a knockout pipe (129795-01950) and oil seal – aftermarket prints often leave those out. This 34-page manual is a scan of the original factory document, not a rewrite. You’re getting the same paper I’d have in my service bay.

Who Needs This Manual and How to Use It

Home garage guys rebuilding a used 3TNES82A out of a skid steer or generator. Shop owners training junior techs on small diesel engines. Anyone who’s ever been stuck because they didn’t know which O-ring goes where. Start by printing page 2 and page 4. Lay them on your bench. Cross out the parts you don’t need. Then order the exact Yanmar part numbers from the list. If you’re doing a head gasket job, the 14 head bolts must be replaced – no reusing. The manual doesn’t spell that out in big red letters, but any ASE tech knows. That’s why I tell you now: those bolts are torque-to-yield. Order them before you start.

Frequently Asked Questions

Does this manual have torque specs for the cylinder head?

The manual lists the head bolt part number (119810-01200) and shows the bolt locations in Figure callouts. Torque values are in the factory specification tables on the relevant pages – you need to match the bolt grade and thread size to the chart. I don’t see a separate torque page, so check the fastener specs in the block diagram.

What year is this manual for?

No publication year in the data. The PCN indicates it’s a factory engineering document, likely mid-2000s. Engine hasn’t changed much – Yanmar still uses the same TNE series architecture.

Does it cover the fuel injection pump?

Yes. Page 4 shows O-ring 121850-51960 for the F.I. pump, plus the pump mounting flange and gear housing interface. No internal injector pump overhaul – that’s a separate manual.

Will this help me rebuild the entire engine?

It covers the block, cylinder head, gear housing, and major internal parts. But it’s 34 pages – it’s not a 600-page service manual. You’ll need separate procedures for valve adjustment and piston ring gaps. It’s the best parts-and-assembly reference you can get for the 3TNES82A.

Related Manuals Worth Your Bench Space

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• Yanmar 2TE67L-BV, SV08-1 Technical Manual – 58-Page Factory Spec Guide”>Yanmar 2TE67L-BV, SV08-1 Technical Manual
• Yanmar EF-494T 2011 Technical Manual – Factory Torque Specs”>Yanmar EF-494T 2011 Technical Manual

For more on diesel engine fundamentals, check out the Manual Transmission”>Manual Transmission theory or Manual Transmission”>Manual Transmission topic – not directly related, but you should understand how power flows through the flywheel housing. Now stop reading and get the job done. Access the Factory Manual and start your rebuild with the right numbers.