Hunting for the correct part number for your Yanmar 4TN84L-RB engine? All 36 pages of this OEM parts catalog (Y00B4002) focus on one thing: pinpointing the right component for the 4TN84L-RB. Inside: exploded view diagrams for every major assembly, from cylinder block and gear housing through the fuel injection pump, governor, and starting motor. You get OEM part numbers cross-referenced across every engine system, including crankshaft and piston assemblies, the lubrication oil circuit, and cooling water system. Need the 0.25 mm undersize main metal or its matching 0.25 mm oversize piston-with-ring? Each variant has its own OEM number, listed directly. Wrong part, wasted trip to the dealer. Download the PDF, tap a bookmark, and pull up exactly the assembly you need.
What's Inside This Yanmar 4TN84L-RB Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Engine | 1-2 | Cylinder Block, Gear Housing, Flywheel Housing & Oil Sump, Cylinder Head & Bonnet, Suc./Exh. Manifold & Cleaner, Camshaft & Driving Gear, Crankshaft & Piston, Lub. Oil System, Cooling Water System, Fuel Injection Pump, Fuel Injection Pipe, Fuel Pipe, Governor, Starting Motor, Generator, Gasket Set (Optional) & Tool |
| Suc./Exh.Manifold & Cleaner | 10-11 | Cleaner Assy, Air, Manifold, Air Intake, Exhaust, Heater |
| Fuel Injection Pump | 20-22 | Pump W/GOV.& F.PUMP, Plunger W/BARREL, Valve W/SEAT, Deliv., Rack, Control, Pinion |
| Governor | 27-29 | Case, Cover, Link, Weight Assy, Gov., Shaft Assy, Control |
| Gasket Set (Optional) & Tool | 34-36 | Gasket, O-Ring, Flex Horn |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Metal Undersize | 0.25 | p. 2 |
| Thrust Metal Oversize | 0.25 | p. 2 |
| Piston w/Ring Oversize | 0.25 | p. 14 |
| Ring Set Oversize | 0.25 | p. 14 |
| Metal Pin Undersize | 0.25 | p. 14 |
Yanmar 4TN84L-RB Common Problems This Manual Covers
Yanmar 4TN84L-RB fuel injection pump plunger and barrel assembly part number unclear when ordering replacements p. 20
Open the Fuel Injection Pump section at page 20. The exploded diagram on page 22 calls out the plunger with barrel and delivery valve with seat by item number. Match each item number to the parts list on page 20 to confirm the correct part number for your serial number range before ordering.
Manual Section: Fuel Injection PumpAir heater part number unclear when cross-referencing intake manifold and cleaner assembly components p. 10
Turn to the Suc./Exh.Manifold & Cleaner section starting on page 10. The diagram on page 11 shows the air heater and cleaner assembly with item call-outs. Match each item number to the parts list on page 10 to pull the correct part number for your configuration before placing an order.
Manual Section: Suc./Exh.Manifold & CleanerGasket set and O-ring part numbers needed for engine rebuild, catalog organization confusing p. 34
Find the Gasket Set section starting on page 34, which covers all gaskets and O-rings across pages 34-36. If the rebuild involves pistons, oversize piston and ring sets are available in 0.25 mm. Cross-reference the parts list on page 34 to confirm the part numbers for your serial number range before ordering.
Frequently Asked Questions
What are the replacement specifications for fuel filters?
For fuel filters, the manual lists "FILTER 90X80L" with part number 129150-35150, found in the Fuel Injection Pump section. Additionally, a "STRAINER ASSY, FUEL" with part number 129100-55621 is listed in the Fuel Pipe section.
What are the replacement specifications for air filter?
For air filter components, the manual specifies a "CLEANER ASSY, AIR" with part number 129432-12500. The associated "ELEMENT" for the air cleaner has part number 121120-12901.
How do you fix yanmar 4TN84L-RB fuel injection pump plunger and barrel assembly part number unclear when ordering replacements?
Open the Fuel Injection Pump section at page 20. The exploded diagram on page 22 calls out the plunger with barrel and delivery valve with seat by item number. Match each item number to the parts list on page 20 to confirm the correct part number for your serial number range before ordering.
How do you fix air heater part number unclear when cross-referencing intake manifold and cleaner assembly components?
Turn to the Suc./Exh.Manifold & Cleaner section starting on page 10. The diagram on page 11 shows the air heater and cleaner assembly with item call-outs. Match each item number to the parts list on page 10 to pull the correct part number for your configuration before placing an order.
What do I get after purchasing this Yanmar 4TN84L-RB & variants manual?
This is a 36-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Am I able to print pages from this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Document Quality
This document is a scanned PDF that includes a highly accurate OCR layer, which means you can search and select the entire text content. All textual elements, including part descriptions and figure labels, are consistently crisp and very easy to read. The diagrams and illustrations are presented with clear, sharp lines, ensuring that all labels and details are perfectly legible even when magnified. The pages are uniformly clean, exhibiting no scan artifacts, smudges, or skewed orientations, and the document contains no blank or unnecessary filler pages.
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