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.
What's Inside This Yanmar 3TN84L-RBS 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 |
Yanmar 3TN84L-RBS Common Problems This Manual Covers
Hard starting after storage or filter service
Air in the fuel lines, a clogged fuel strainer, or worn injection pump components are the usual suspects. The catalog's Fuel System, Fuel Injection Pump, and Fuel Return Line sections identify the strainer assembly, check valve, pipes, and pump internals by part number so you replace the right pieces the first time.
Manual Section: Fuel Injection Pump / Fuel System p. 35Overheating or high-temperature shutdowns
A stuck thermostat, tired water pump, or slipping belt will push this engine hot. The Cooling Water System, Thermostat, and Cooling Water Line sections cover the pump assembly, thermostat case and gaskets, cooling fan, and the A-38 V-belt.
Manual Section: Cooling Water System / Thermostat p. 28Governor hunting and unstable idle speed
Worn governor links and case components cause RPM hunting or an engine that won't hold steady speed. The dedicated Governor section lists the case, covers, gaskets, and the individual links by length so you can rebuild the assembly correctly.
Manual Section: Governor p. 43Excessive smoke from worn injector nozzles
Tired nozzles and injection wear show up as smoke, noisy combustion, and poor fuel economy. The Fuel Injection Line section breaks the injector down to the nozzle assembly, holder, spring, and spring seat, so you can service injectors instead of replacing complete units.
Manual Section: Fuel Injection Line p. 37Low oil pressure warnings
A worn lube oil pump or a failing oil pressure switch triggers low-pressure alarms. The Lub. Oil System and Lub. Oil Line sections list the pump assembly, oil pressure switch, pipes, and joint bolts with gaskets.
Manual Section: Lub. Oil System / Lub. Oil Line p. 24Starter drags or fails to engage
Worn brushes and bearings are routine wear items on these starters. The Starting Motor section itemizes the armature assembly, field coil, brushes, and brush holder, letting you rebuild the starter rather than buy a whole new unit.
Manual Section: Starting Motor p. 45Oil leaks at seals and gaskets
Leaks at the crankshaft seals, oil pan, and housing joints are common on higher-hour engines. The Flywheel Housing section covers the oil seal case assembly, and the Gasket Set & Special Tool section lists a complete non-asbestos gasket set for a full reseal.
Manual Section: Flywheel Housing / Gasket Set p. 8Frequently Asked Questions
Which engine does this parts catalog cover?
It covers the Yanmar 3TN84L-RBS engine, Yanmar publication number Y00B4092. All 24 sections of the engine are included, from cylinder block and crankshaft through the fuel injection system, governor, cooling system, starting motor, and generator. p. 1
Is this a service manual with repair procedures and torque specs?
No. It is a parts catalog: exploded diagrams with factory part numbers and quantities for the assemblies across its 24 sections. It does list repair sizing parts such as 0.25 undersize main and crankpin bearings and 0.25/0.5 oversize piston rings, but it does not contain step-by-step procedures or torque values.
Does it include actual Yanmar part numbers I can order from?
Yes. Every component is listed with its Yanmar factory part number and quantity per engine: cylinder block assembly, main bearings, gaskets, injector nozzle parts, and so on. Previous-model part references and non-asbestos gasket alternatives are also flagged, which helps when sourcing parts for older engines.
Does it help identify fuel system parts?
Yes. Dedicated sections cover the Fuel Injection Pump (pp. 35-36), Fuel Injection Line (pp. 37-38), Fuel System (pp. 39-40), and Fuel Return Line (pp. 41-42), with part numbers and quantities for the pump internals, injector nozzle components, strainer, and pipes. p. 35
What format is this Yanmar 3TN84L-RBS manual in?
You get a 49-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Is this Yanmar 3TN84L-RBS Parts Catalog printable?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Reviews
There are no reviews yet.