All 49 pages of this Yanmar 3TN84L-RBS Parts Catalog (OEM #Y00B4092) zero in on one job: identifying and ordering the exact components your 3TN84L-RBS or 3TN84L-RBSVM engine needs. Inside, exploded-view diagrams cover every major assembly (cylinder block, crankshaft and flywheel, fuel injection pump, cooling water system, and governor), each paired with a complete OEM parts list. You also get coverage of oversized and undersized variants, so you can confirm the correct piston ring set (OS=0.25 or OS=0.50) or main bearing spec before placing your order. Specify the V-belt as A-38 and match the P-16.0 O-ring to the right lube oil system location without digging through a parts counter printout. Ordering the wrong part costs days. Download this PDF, search by assembly or keyword, and confirm the part number before you call the supplier.
What's Inside This Yanmar 3TN84L-RBS Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-3 | Product Number, Product Name |
| Cylinder Block | 4-5 | Oversized Part Undersized Part, Block Assembly Cylinder Parts, Plug PT1/8 Screw Parts, Bolt Bearing Cap Parts, Main Bearing Parts, Bush Camshaft Parts, Stud Cyl Head Parts |
| Gear Housing | 6-7 | Housing Gears W/Seal Parts, Flange Gears Housing Parts, Stud M 8X 22 Parts, Cover Ho-P Parts, Pipe Knock L=18 Parts, Bolt M 8X 55 Plated Parts, Seal Washer 8S Parts |
| Flywheel Housing | 8-9 | Housing Flywheel Parts, Cap Flywheel Cover Parts, Bolt M10X25 Parts, Case Assembly Oil Seal Parts, Case Oil Seal Parts, Bolt M 8X 30 Plated Parts, Previous Model Information |
| Lub. Oil Sump | 10-11 | Sump Assembly Lub Oil Parts, Oil Pan Assembly Parts, Cover Oil Pan Parts, Bolt M 8X120 Plated Parts, Plug M16 Parts, Seal Washer 16S Parts, Bolt M 8X 12 Plated Parts |
| Bonnet | 12-13 | Assembly Parts, Cover Breather Parts, Plate Shelter Parts, Baffle Breather Parts, Pipe Breather Parts, Knob Parts, Cap Lub Oil Supply Parts, Gasket Bonnet Parts |
| Cylinder Head | 14-15 | Repair Part Information, Head Assembly Cylinder Parts, Stud M 6X 20 Plated Parts, Plug 22 Parts, Plug 40 Parts, Valve Intake Parts, Valve Exhaust Parts, Spring Valve Parts |
| Suction & Exhaust Manifold | 16-17 | Manifold Suction Parts, Gasket Suction Manifold Parts, Silencer Parts, Stay Silencer Parts, Nut W/Washer 8 Parts, Bolt M 8X 20 Parts, Manifold Exhaust Parts |
| Camshaft & Driving Gear | 18-19 | Camshaft Assembly Parts, Gear Camshaft Parts, Rod Push Parts, Shaft Idle Gear Parts, Gear W/Bush Parts, Bush Idle Gear Parts, Bearing Thrust Parts, Key 7X 14 Parts |
| Crankshaft & Flywheel | 20-21 | Crankshaft Assembly Parts, Gear Crankshaft Parts, V-Pulley Crankshaft Parts, Washer Parts, Bolt V-Pulley Parts, Bolt Flywheel Parts, Flywheel W/Ring Gear Parts, Gear Ring Parts |
| Piston & Connecting Rod | 22-23 | Oversized Part, Undersized Part, Repair Part, Piston W/Ring Parts, Ring Set Piston Parts, Pin Piston Parts, Piston W/Ring OS=.25 Parts, Ring Set O.S=0.25 Parts |
| Lub. Oil System | 24-25 | Pump Assembly Lub Oil Parts, Dipstick Lub Oil Parts, Dipstick Parts, Guide Dipstick Parts, Pipe Assembly Oil Inlet Parts, Bolt M 8X 35 Plated Parts, Bracket Strainer Parts |
| Lub. Oil Line | 26-27 | Fuel Injection Pump Information, Bolt 10 Pipe Joint Parts, Switch Oil Pressure Parts, Pipe Assembly Lub Oil Parts, Bolt 8 Pipe Joint Parts, Gasket 8 Round Parts |
| Cooling Water System | 28-29 | Pump Assembly C.Water Parts, Pump C.W. Non-ASB Parts, V-Belt Parts, V-Pulley Parts, Fan Cooling Parts, Spacer Parts, Gasket C.W. Pump Parts, Bolt M 8X 60 Plated Parts |
| Thermostat | 30-31 | Cover Thermostat Parts, Case Assembly Thermostat Parts, Joint PT1/8 Parts, Gasket Cover Parts, Cover Thermost.Case Parts, Bolt M 6X 16 Plated Parts, Gasket Thermo.Cover Parts |
| Cooling Water Line | 32-34 | Joint PT1/4 Parts, Pipe C.W. By-Pass Parts, Clamp 16 Parts, Switch Thermo Parts, Gasket 16 Parts, Plug M16 Parts |
| Fuel Injection Pump | 35-36 | Pump Assembly F.I.Pump Parts, Camshaft Parts, Ball Bearing Thrust Parts, Retainer Bearing Parts, Key Parts, Plunger W/Barrel Parts, Pin Barrel Locking Parts, Retainer a Parts |
| Fuel Injection Line | 37-38 | Valve Assembly F.Inject Parts, Nozzle Assembly F.Inject Parts, Nut Nozzle Case Parts, Holder Assembly Nozzle Parts, Spring Nozzle Parts, Seat Nozzle Spring Parts, Plate Stop Parts |
| Fuel System | 39-40 | Strainer Assembly Fuel Parts, Valve Taper Parts, Spring Taper Valve Parts, Screw M 4 Parts, O-Ring 1A P-10A Parts, Lever Parts, Cup Strainer Parts, Ring Retaining Parts |
| Fuel Return Line | 41-42 | Refer to Fig. 18, Refer to Fig. 16, Pipe Fuel Return Parts, Joint Parts, Valve Assembly Check Parts, Gasket 12 Round Parts, Clamp 12 Parts, Clamp 8 Parts |
| Governor | 43-44 | Classified Mark, Case Governor Parts, Gasket Gov. Case Parts, Cover Governor Case Parts, Gasket Case Cover Parts, Link L=30 Parts, Link L=31 Parts, Link L=30.5 Parts |
| Starting Motor | 45-46 | Flywheel Housing Information, Starter Parts, Armature Assembly Parts, Bearing Parts, Coil Assembly Field Parts, Screw Pole Core Set Parts, Brush Parts, Holder Assembly Brush Parts |
| Generator | 47-48 | Stud Parts, Washer Spring Parts, Collar Parts, Washer 10 Parts, Plate Assembly Parts, Clamp Parts, Stator Parts, Coupler Parts |
| Gasket Set & Special Tool (Optional) | 49 | Gasket Set Non-ASB Parts, Gasket Suc.Manifold Parts, Gasket Exh.Manifold Parts, Flex Horn Parts, Gasket Head Parts, Gasket Ho-P Parts, O-Ring F.I.Pump Parts |
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 |
| Cotter Pin Size | 8 | p. 13 |
| 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 |
| Spring Pin Size | 4X10 | p. 19 |
Yanmar 3TN84L-RBS Common Problems This Manual Covers
Yanmar 3TN84L-RBS missing fuel injection pump assembly part numbers during troubleshooting for hard starting and rough idle p. 35
Review the fuel system parts breakdown on page 35. Locate the plunger with barrel and pin barrel locking parts. Verify the specific fuel injection pump assembly numbers before ordering replacements. Cross-reference the O-Ring 1A P-16.0 size P-16.0 on page 5 to ensure correct sealing components.
Manual Section: Fuel Injection PumpCannot identify correct replacement water pump and cooling fan components for engine overheating and frequent high-temperature shutdowns p. 28
Inspect the cooling system parts exploded view on page 28. Identify the water pump assembly, cooling fan, and necessary spacer plates. Check page 27 to find the exact V-Belt size A-38 and the V-Pulley diameter 120 specification. Order the corresponding gasket to prevent future coolant leaks.
Manual Section: Cooling Water SystemUnable to locate correct undersized crankpin bearing part numbers to fix lower engine knocking noise and vibration p. 20
Check the crankshaft assembly breakdown on page 20. Locate the required replacement bearings in the parts list. Refer to page 21 to find the exact part numbers for the crankpin bearing undersize 0.25 option. Match this to your machined crankshaft dimensions before ordering the new components.
Manual Section: Crankshaft & FlywheelNeed exploded view to identify internal governor linkages and case gaskets for unstable governed speed and hunting p. 43
Examine the governor case diagram on page 43. Identify the specific link L=30 and link L=31 parts required for your application. Check the parts list for the correct governor case cover gasket. Confirm the spring pin size 4X10 on page 19 for related mechanical linkage assemblies.
Manual Section: GovernorFrequently Asked Questions
What are the replacement specifications for fuel filters?
The fuel filter element for the Yanmar 3TN84L-RBS is identified by part number 129100-55650. This manual indicates that one unit of this element is used in the fuel system.
What are the replacement specifications for thermostat?
The thermostat for the Yanmar 3TN84L-RBS is identified by part number 129155-49800. This manual indicates that one unit of this thermostat is used.
How do you fix yanmar 3TN84L-RBS missing fuel injection pump assembly part numbers during troubleshooting for hard starting and rough idle?
Review the fuel system parts breakdown on page 35. Locate the plunger with barrel and pin barrel locking parts. Verify the specific fuel injection pump assembly numbers before ordering replacements. Cross-reference the O-Ring 1A P-16.0 size P-16.0 on page 5 to ensure correct sealing components.
How do you fix cannot identify correct replacement water pump and cooling fan components for engine overheating and frequent high-temperature shutdowns?
Inspect the cooling system parts exploded view on page 28. Identify the water pump assembly, cooling fan, and necessary spacer plates. Check page 27 to find the exact V-Belt size A-38 and the V-Pulley diameter 120 specification. Order the corresponding gasket to prevent future coolant leaks.
What format is this 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.
Document Quality
This document is a scanned PDF, and it includes an OCR layer, so you can search and copy the full text content. The textual information is consistently crisp and easy to read across all pages. Diagrams and illustrations are raster images, but they are sufficiently sharp, and all labels within them are clearly legible. The pages are clean, free of significant stains or marks, with only very minor page skewing present on some pages that does not impact readability.
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