Part of the Yanmar Parts Manuals.
A worn plunger on the bench tells you what failed; it does not tell you Yanmar's number for its replacement, and the engine sits until you have it. This 36-page parts catalog, Yanmar publication Y00B4002, closes that gap for the 4TN84L-RB, 4TN84L-RBF, 4TN84L-RBVM, 4LN84L-RBFVM, and 4TN84L-RB/F engines with exploded views keyed to factory part numbers.
Coverage runs from the cylinder block, crankshaft and piston, and camshaft through the lubricating oil and cooling water systems to the fuel injection pump, governor, starting motor, and generator. Piston listings include 0.25 and 0.50 oversize pistons with rings, plus undersize main and thrust metals, so one order covers the machining.
Serial and spec number prefixes printed in the catalog let you confirm the match to your engine before ordering. It downloads as a bookmarked PDF, so the fuel injection pump breakdown is two clicks away, not twenty minutes of page turning.
What's Inside This Yanmar 4TN84L-RB Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Engine | 1-2 | Cylinder Block Assy, Round Gasket, Main Metal, Thrust Metal, Camshaft Bush, Cylinder Head Gasket, Gasket |
| Suc./Exh.Manifold & Cleaner | 10-11 | Hose, Air Cleaner Assy, Dust Pan Assy, Element Retainer, Element, Brace Assy, Rubber Seat, Cleaner Support Assy |
| Fuel Injection Pump | 20-22 | Pump w/ Governor & Feed Pump, Camshaft, Thrust Ball Bearing, Cam Shaft Support, Plunger w/ Barrel, Retainer A, Plunger Spring Shoe, Plunger Spring |
| Governor | 27-29 | Governor Case, Case, Governor Case Gasket, Governor Case Cover, Case Cover Gasket, Link, Governor Weight Assy, Sleeve |
| Gasket Set (Optional) & Tool | 34-36 | Gasket Set, Cylinder Head Gasket, Hydraulic Oil Pump Gasket, Oil Seal Case Gasket, Valve Stem Seal, Nozzle Protector, Nozzle Protecter, Nozzle Seat |
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
Hard starting traced to fuel delivery
A 4TN84L that cranks but will not light off usually has air, contamination, or a worn pump element in the fuel path. The Fuel Injection Pump section breaks the pump down to the plunger with barrel and delivery valve with seat, so you can order replacement elements instead of a complete pump.
Manual Section: Fuel Injection Pump p. 20Overheating and cooling system failures
Blocked passages, a tired water pump, or a stuck thermostat will push these engines hot fast. The Cooling Water System section identifies the cooling hardware by part number so a proper cooling overhaul goes out in one order.
Manual Section: Cooling Water SystemLow oil pressure and bearing wear
Contaminated oil or a clogged filter starves the crank and burns bearings. The Lub. Oil System section covers the lubrication parts, and the catalog also lists undersize main and thrust metals for a crank that has already been ground.
Manual Section: Lub. Oil SystemHunting or surging engine speed
Erratic idle and speed surge point to wear in the governor. The Governor section lists the case and cover, link, governor weight assembly, and control shaft assembly so worn pieces can be replaced individually.
Manual Section: Governor p. 27Black smoke and a starved intake
A plugged air cleaner shows up as black smoke and lost power, and cold-start trouble can trace to the air heater. This section covers the air cleaner assembly, intake and exhaust manifolds, and the air heater.
Manual Section: Suc./Exh.Manifold & Cleaner p. 10Bores and journals worn past standard
At teardown, measurement often shows bores or journals beyond standard limits. The Crankshaft & Piston listings include piston with ring assemblies and ring sets in 0.25 and 0.50 oversize, plus 0.25 undersize metals, so the parts order matches the machine work.
Manual Section: Crankshaft & PistonOil and coolant seeps after reassembly
Reused gaskets and O-rings are the usual cause of leaks after an engine goes back together. The Gasket Set (Optional) & Tool section lists the optional gasket set and O-rings so the whole engine can be resealed from one listing.
Manual Section: Gasket Set (Optional) & Tool p. 34Frequently Asked Questions
Which Yanmar engine models does this parts catalog cover?
It covers the Yanmar 4TN84L-RB, 4TN84L-RBF, 4TN84L-RBVM, and 4LN84L-RBFVM engines, also listed as 4TN84L-RB/F. Serial and engine number prefixes such as TN-89203, E/#01528 are given so you can confirm the match to your engine before buying.
Is this a service manual with repair procedures and torque specs?
No. This is the factory parts catalog, Yanmar publication Y00B4002. It gives exploded views and part numbers for everything from the cylinder block to the governor and starting motor, for identifying and ordering parts, not step-by-step repair procedures or torque values.
Does it list oversize and undersize parts for a rebuild?
Yes. The Crankshaft & Piston listings include piston with ring assemblies and ring sets in 0.25 and 0.50 oversize, plus 0.25 undersize main metal and pin metal and 0.25 oversize thrust metal, so a reground crank and rebored block can be ordered for directly.
How detailed is the fuel injection pump breakdown?
The Fuel Injection Pump section starts on page 20 and breaks the pump with governor and feed pump down to the plunger with barrel, delivery valve with seat, control rack, and control pinion, so individual elements can be ordered rather than a complete pump. p. 20
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.
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