Part of the Yanmar Parts Manuals.
This is the factory Yanmar parts catalog for the 3TN84L-RBS diesel engine (publication Y00B4092), delivered as a 49-page downloadable PDF. It maps the complete engine in 24 bookmarked sections, from the cylinder block, cylinder head, and crankshaft through the fuel injection pump, governor, cooling system, starting motor, and generator, with exploded diagrams and numbered parts lists throughout.
Use it to pull exact Yanmar part numbers and quantities before you order: main bearings, gaskets, injector nozzle components, water pump and thermostat parts, the A-38 V-belt, and more. The catalog also flags repair sizing options such as 0.25 undersize main and crankpin bearings and 0.25/0.5 oversize piston rings, plus previous-model part references and non-asbestos gasket alternatives that help when sourcing parts for older engines.
The file has a searchable text layer and downloads right after purchase. Keep it on a phone in the shop or print it page by page at the bench.
Other edition of this manual
What's Inside This Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-3 | Product Numbers and Names, Catalog Usage Notes |
| Cylinder Block | 4-5 | Block Assembly, Main Bearings, Camshaft Bushes, Oversize and Undersize Options |
| Gear Housing | 6-7 | Gear Housing with Seal, Housing Flange, Covers and Fittings |
| Flywheel Housing | 8-9 | Cover Cap, Oil Seal Case, Previous Model References |
| Lub. Oil Sump | 10-11 | Oil Sump Assembly, Oil Pan and Cover, Drain Plug |
| Bonnet | 12-13 | Bonnet Assembly, Breather Cover and Baffle, Oil Filler Cap, Bonnet Gasket |
| Cylinder Head | 14-15 | Cylinder Head Assembly, Intake and Exhaust Valves, Valve Springs, Repair Part Information |
| Suction & Exhaust Manifold | 16-17 | Intake and Exhaust Manifolds, Manifold Gaskets, Silencer |
| Camshaft & Driving Gear | 18-19 | Camshaft Assembly, Camshaft Gear, Push Rods, Idle Gear and Bush, Thrust Bearing |
| Crankshaft & Flywheel | 20-21 | Crankshaft Assembly, Crankshaft Gear, V-Pulley, Flywheel with Ring Gear |
| Piston & Connecting Rod | 22-23 | Pistons with Rings, Piston Ring Sets, Piston Pins, Oversize Ring Options (0.25 Mm) |
| Lub. Oil System | 24-25 | Oil Pump Assembly, Dipstick and Guide, Oil Inlet Pipe, Strainer Bracket |
| Lub. Oil Line | 26-27 | Oil Pressure Switch, Oil Pipe Assemblies, Pipe Joints |
| Cooling Water System | 28-29 | Water Pump Assembly, V-Belt and Pulley, Cooling Fan, Non-Asbestos Pump Option |
| Thermostat | 30-31 | Thermostat Case Assembly, Covers, Gaskets |
| Cooling Water Line | 32-34 | Bypass Pipe, Thermo Switch, Clamps and Gaskets |
| Fuel Injection Pump | 35-36 | Injection Pump Assembly, Pump Camshaft, Plunger with Barrel, Thrust Bearing |
| Fuel Injection Line | 37-38 | Injector Nozzle Assembly, Nozzle Holder, Delivery Valve, Nozzle Springs |
| Fuel System | 39-40 | Fuel Strainer Assembly, Taper Valve, Strainer Cup |
| Fuel Return Line | 41-42 | Fuel Return Pipe, Check Valve Assembly, Joints and Clamps |
| Governor | 43-44 | Governor Case and Cover, Gaskets, Governor Links |
| Starting Motor | 45-46 | Starter, Armature Assembly, Field Coil, Brushes and Brush Holder |
| Generator | 47-48 | Stator, Plate Assembly, Coupler, Mounting Hardware |
| Gasket Set & Special Tool (Optional) | 49 | Non-Asbestos Gasket Set, Head Gasket, Manifold Gaskets, Special Tools |
Every system also includes a diagram.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Bearing Undersize | 0.25 | p. 3 |
| O-Ring 1A P-16.0 Size | P-16.0 | p. 5 |
| O-Ring 1A S-50.0 Size | S-50.0 | p. 11 |
| V-Belt Size | A-38 | p. 27 |
| V-Pulley Diameter | 120 | p. 27 |
| Piston Ring Oversize | 0.25 | p. 21 |
| Crankpin Bearing Undersize | 0.25 | p. 21 |
