Need the factory part numbers for your Yanmar 3TN84L-RBB engine? This 49-page Yanmar 3TN84L-RBB parts catalog PDF (OEM #Y00B4421) puts the complete component reference for every assembly, from cylinder block to suction and exhaust manifold, in your hands. Inside: exploded views with individual part numbers and cross-references across seven major assemblies, including Cylinder Block, Gear Housing, Flywheel Housing, Lub. Oil Sump, Bonnet, Cylinder Head, and Suction & Exhaust Manifold. Every seal, bearing, and fastener has its own line entry, with part-specific dimensions like main bearing undersize 0.25 mm and O-ring sizes 16.0, 26.0, and 32.0 mm so you order exactly the right part the first time. Done guessing from a worn tag. Bookmarked by assembly and searchable by keyword, jump straight to the system you need and get the part number in seconds.
What's Inside This Yanmar 3TN84L-RBB Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 3-4 | Plug PT1/4, Bolt, Bearing Cap, Main Bearing, Bearing, Thrust, Bush, Camshaft |
| Gear Housing | 5-6 | Seal, Oil, Stud M 8X 22, Cap, LUB.OIL Supply, Flange, Gears Housing, Gasket |
| Flywheel Housing | 7-8 | Parallel Pin 8X16, Housing, Flywheel, Cap, Flywheel Cover, Case Assy, Oil Seal, Seal |
| Lub.Oil Sump | 9-10 | Sump Assy, Lub Oil, Cover, Oil Sump, Plug M16, Seal Washer 16S, Bolt M |
| Bonnet | 11-12 | - |
| Cylinder Head | 13-14 | - |
| Suction & Exhaust Manifold | 15-49 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Bearing Undersize | 0.25 | p. 2 |
| Thrust Bearing Undersize | 0.25 | p. 2 |
| O-RING 1A P-16.0 | 16.0 | p. 4 |
| O-RING 1A P-32.0 | 32.0 | p. 4 |
| O-RING 1A P-26.0 | 26.0 | p. 4 |
| O-RING 1A S-24.0 | 24.0 | p. 4 |
| O-RING 1A P-32.0 (Bonnet) | 32.0 | p. 10 |
| O-RING 1A S-50.0 | 50.0 | p. 10 |
| O-RING 1A P 12.0 | 12.0 | p. 10 |
| V-BELT (A-38) | 38 | p. 26 |
| V-PULLEY Diameter | 110 | p. 26 |
| O-RING 1A G-65.0 | 65.0 | p. 37 |
Yanmar 3TN84L-RBB Common Problems This Manual Covers
Yanmar 3TN84L-RBB cylinder head gasket part number needed, engine pulled for overhaul p. 13
Open the Cylinder Head Assembly exploded view on page 13. The head gasket is listed as a separate line item alongside valves, springs, and rocker arm components. Cross-reference each callout number in the diagram against the parts list on the same spread, then verify the part number in the Parts Number List on page 2 to confirm compatibility with your serial number range before ordering.
Manual Section: Cylinder Head AssemblyGear housing oil seal leaking, need correct O-ring dimensions before ordering replacement parts p. 5
Check the Gear Housing exploded view on page 5. Four O-rings are called out for this assembly: P-16.0 (16.0 mm), P-32.0 (32.0 mm), P-26.0 (26.0 mm), and S-24.0 (24.0 mm), all 1A-series, listed with verified dimensions on page 4. Match each callout number to the parts list before ordering to avoid mixing incompatible seal sizes.
Manual Section: Gear Housing AssemblyWater pump V-belt worn through, need correct belt spec and pulley diameter to source a replacement p. 26
Turn to the Cooling Water System Assembly on page 26. The drive belt is a V-BELT A-38 and the fan V-pulley diameter is 110 mm, both confirmed on page 26. Locate the Yanmar part numbers in the parts list alongside the exploded diagram, then cross-reference against the Parts Number List on page 2 before purchasing from a supplier.
Manual Section: Cooling Water System AssemblyMain bearing replacement required after crankshaft inspection, unsure which undersize part number to order p. 3
Locate the Cylinder Block Assembly diagram on page 3. Main bearings and thrust bearings are both listed at 0.25 mm undersize; verify your crankshaft journal measurement against this figure before selecting a part number. Bearing Cap, Main Bearing, and Thrust components each have separate callout numbers, so identify each individually in the parts list and confirm in the Parts Number List on page 2.
Manual Section: Cylinder Block AssemblyOil sump drain plug seal weeping, need part numbers for seal washer and sump cover gasket p. 9
Check the Lub. Oil Sump Assembly exploded view on page 9. The parts list breaks out the Sump Assy, oil sump cover, drain plug M16, and Seal Washer 16S as individual line items with separate part numbers. Identify each callout in the diagram, then verify against the Parts Number List on page 2 to confirm the correct seal washer for the M16 drain plug.
Manual Section: Lub. Oil Sump AssemblyBonnet breather cover O-rings seeping oil, three different O-ring sizes visible in exploded diagram p. 11
Open the Bonnet Assembly exploded view on page 11. Three 1A-series O-rings are listed for this assembly: P-32.0 (32.0 mm), S-50.0 (50.0 mm), and P-12.0 (12.0 mm), all confirmed with dimensions on page 10. Match each diagram callout number to its corresponding line item in the parts list and note the required quantity for each size before submitting your order.
Manual Section: Bonnet AssemblyFrequently Asked Questions
What are the replacement specifications for fuel filters?
The replacement specification for the fuel filter element is identified by part number 129100-55650. This part is listed as "ELEMENT, FUEL" with a quantity of 1 in the manual.
What are the replacement specifications for injector-related parts?
Replacement specifications for injector-related parts include "VALVE ASSY,F.INJECT" (part number 729506-53100), "NOZZLE ASSY,F.INJECT" (part number 129506-53000), and "HOLDER ASSY, NOZZLE" (part number 129100-53100). These parts are listed with quantities of 3 each.
How do you fix yanmar 3TN84L-RBB cylinder head gasket part number needed, engine pulled for overhaul?
Open the Cylinder Head Assembly exploded view on page 13. The head gasket is listed as a separate line item alongside valves, springs, and rocker arm components. Cross-reference each callout number in the diagram against the parts list on the same spread, then verify the part number in the Parts Number List on page 2 to confirm compatibility with your serial number range before ordering.
How do you fix gear housing oil seal leaking, need correct O-ring dimensions before ordering replacement parts?
Check the Gear Housing exploded view on page 5. Four O-rings are called out for this assembly: P-16.0 (16.0 mm), P-32.0 (32.0 mm), P-26.0 (26.0 mm), and S-24.0 (24.0 mm), all 1A-series, listed with verified dimensions on page 4. Match each callout number to the parts list before ordering to avoid mixing incompatible seal sizes.
What do I get after purchasing this Yanmar 3TN84L-RBB manual?
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.
Can I print specific sections of this Yanmar 3TN84L-RBB Parts Catalog?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Document Quality
This document is a scanned PDF with an optical character recognition (OCR) layer, allowing you to search and copy the full text. The text throughout is crisp and easy to read. Diagrams and illustrations are scanned raster images, but their labels are generally clear and legible. Pages are clean with no significant scan artifacts or marks, though some may have minor skewing. There are no notable blank or filler pages.
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