All 37 pages of this Yanmar 4TN84L-RBB engine parts catalog PDF (OEM #Y00B4401) map every component from cylinder block and gear housing to the governor, both starting motor variants, and the full gasket set. Inside: exploded views and Yanmar factory part numbers for every system, from crankshaft and piston assemblies to the fuel injection pump, cooling water pump, and lubrication circuit. Every O-ring, seal, fastener, and subassembly carries its own callout, so you identify the exact piece before you ever pick up the phone. Cross-reference the 0.25mm undersize main bearing or the M10x25 flywheel bolt; both catalog entries put the factory part number directly next to the exploded view. Stop ordering by description and hoping it fits. Bookmarked by system, so you jump straight to Cooling Water, Fuel Injection Pipe, or Starting Motor in one click and search any component by keyword on any device.
What's Inside This Yanmar 4TN84L-RBB 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 (Previous), Starting Motor (New), Generator, Gasket Set (Optional) & Tool |
| Suc./ Exh. Manifold & Air Cleaner | 11-12 | Cleaner Assy, Air, Manifold, Air Intake, Exhaust, Gasket, SUC.MANIFOLD |
| Cooling Water System | 19-21 | Pump Assy, C.WATER, V-Belt, V-Pulley, Fan, Cooling, Thermostat, Pipe |
| Starting Motor (Previous) | 30-31 | Starter, Armature Assy, Coil Assy, Field, Brush, Pinion Assy, Switch, Magnetic |
| Starting Motor (New) | 32-33 | Starter, Armature Assy, Coil Assy, Field, Brush, Pinion Assy, Clutch Assy |
| Gasket Set (Optional) & Tool | 36-37 | Gasket, CYL.HEAD, Liquid, O-Ring, Seal, Valve Stem |
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 | P-16.0 | p. 4 |
| Pipe, Knock Length | 18 | p. 4 |
| Bolt M10x25 | M10x25 | p. 6 |
| Nut M8xP1.0 | M8xP1.0 | p. 8 |
| O-Ring 1A S-50.0 | S-50.0 | p. 8 |
| Clamp Size | 60 | p. 10 |
| Key Size | 7x14 | p. 12 |
| Piston W/Ring Oversize | 0.25 | p. 14 |
| V-Pulley Diameter | 120 | p. 18 |
Yanmar 4TN84L-RBB Common Problems This Manual Covers
Yanmar 4TN84L-RBB water pump impeller, thermostat, and V-belt part numbers won't resolve to a single replacement kit p. 19
Check the Cooling Water System exploded view starting on page 19. The water pump assembly, thermostat, and V-belt each carry separate part numbers, not a bundled kit. Locate the V-pulley (120 mm diameter, page 18) and confirm belt cross-section before ordering. Cross-reference clamps and pipe part numbers in the same section; they frequently need replacement alongside the impeller.
Manual Section: Cooling Water System Repair/MaintenanceCorrect air cleaner element part number unclear, aftermarket listings don't match OEM assembly breakdown p. 11
Open the Suc./Exh. Manifold & Air Cleaner exploded view on page 11. The air cleaner assembly lists the element as a sub-component with its own part number. Verify the 7x14 mm key (page 12) for the cleaner mounting shaft before ordering; a mismatched part causes improper seating and intake leaks. Cross-check your serial number range in the parts index to confirm the correct element suffix.
Manual Section: Suc./ Exh. Manifold & Air Cleaner Repair/MaintenanceCylinder head gasket set contents unclear, can't confirm all seals included for a complete top-end overhaul p. 36
Reference the Gasket Set exploded view on page 36. This optional kit groups the cylinder head gasket, liquid gasket, O-rings, and valve stem seals as one set. The size-60 hose clamp for the intake manifold is not included; order it separately from the Suc./Exh. Manifold section on page 11. Verify the gasket set part number suffix matches your serial number range before purchasing.
Manual Section: Gasket Set (Optional) & ToolOil strainer, filter, and oil pump assembly part numbers for a service interval won't cross-reference cleanly
Locate the Lub. Oil System section for the oil strainer, filter, oil pump, and oil pressure switch part numbers , each is listed separately and must be ordered individually. For the oil sump drain seal, cross-reference the O-ring (size S-50.0) in the Flywheel Housing & Oil Sump section on page 8. Confirm each part number against your serial number range before placing the order.
Manual Section: Lub. Oil System Repair/MaintenancePiston and ring set part numbers ambiguous between standard and oversize bore after cylinder measurement
Check the Crankshaft & Piston exploded view. Pistons and ring sets are available in 0.25 mm oversize (page 14); if the bore has been machined, order the oversize set and verify the part number suffix. Each piston entry lists separate part numbers for the piston body, ring set, wrist pin, connecting rod bearings, and circlips. Match the oversize designation to the machined bore before purchasing.
Manual Section: Crankshaft & Piston Repair/MaintenanceFrequently Asked Questions
What are the replacement specifications for fuel filters?
For the fuel strainer assembly, the replacement part number is 129100-55621, and for the fuel element, the replacement part number is 129100-55650. Each of these components is required in a quantity of 1.
How do you fix yanmar 4TN84L-RBB water pump impeller, thermostat, and V-belt part numbers won't resolve to a single replacement kit?
Check the Cooling Water System exploded view starting on page 19. The water pump assembly, thermostat, and V-belt each carry separate part numbers, not a bundled kit. Locate the V-pulley (120 mm diameter, page 18) and confirm belt cross-section before ordering. Cross-reference clamps and pipe part numbers in the same section; they frequently need replacement alongside the impeller.
How do you fix correct air cleaner element part number unclear, aftermarket listings don't match OEM assembly breakdown?
Open the Suc./Exh. Manifold & Air Cleaner exploded view on page 11. The air cleaner assembly lists the element as a sub-component with its own part number. Verify the 7x14 mm key (page 12) for the cleaner mounting shaft before ordering; a mismatched part causes improper seating and intake leaks. Cross-check your serial number range in the parts index to confirm the correct element suffix.
How do you fix cylinder head gasket set contents unclear, can't confirm all seals included for a complete top-end overhaul?
Reference the Gasket Set exploded view on page 36. This optional kit groups the cylinder head gasket, liquid gasket, O-rings, and valve stem seals as one set. The size-60 hose clamp for the intake manifold is not included; order it separately from the Suc./Exh. Manifold section on page 11. Verify the gasket set part number suffix matches your serial number range before purchasing.
How will I receive this Yanmar 4TN84L-RBB Parts Catalog?
Immediate download of the complete 37-page searchable Parts Catalog. Access it on any device, from a laptop at your desk to a phone in the field.
Is this Yanmar 4TN84L-RBB 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 mixed-format PDF, featuring both searchable text and scanned image pages. You can search and copy the full text, which is crisp and easy to read throughout the document. All diagrams and illustrations are raster images, meaning they are clear at normal viewing but will pixelate when highly magnified, though their labels remain readable. The pages are clean, free of scan artifacts, stains, or skewed content. There are no blank or filler pages present.
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