Part of the Yanmar Parts Manuals.
A set of reconditioned injectors goes back in, and the engine that ran fine last week now starts hard and hazes unburned fuel. Before you order another round of parts on a guess, you need the exact Yanmar part numbers, and that is the whole job of this book.
This is the Yanmar parts catalog, publication Y00R4471, for the 3TNE84-SA, 3TNE84-G1A, 3TNE84-G2A, and 3TNE84C-G1A diesel engines. Across 33 pages it breaks the engine down system by system: cylinder block, cylinder head, crankshaft and piston, lube oil, cooling water, fuel injection pump, governor, injection valves, fuel filter, starting motors, generator, panel, and the complete gasket set.
Whether your 3TNE84 drives a genset, a pump, or sits stripped on a stand, this catalog puts the right numbers in front of you, in a 0.98 MB PDF that travels to wherever the engine is.
What's Inside This Yanmar 3TNE84-SA / G1A / G2A / C-G1A Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 1-1 | Cylinder Block Assembly, Part Numbers |
| Gear Housing | 2-2 | Gear Housing Assembly, Timing Gear Train, Part Numbers |
| Flywheel Housing & Oil Sump | 3-3 | Flywheel Housing, Oil Sump, Part Numbers |
| Cylinder Head & Bonnet (1) | 4-4 | Cylinder Head Assembly, Bonnet, Valves, Part Numbers |
| Cylinder Head & Bonnet (2) | 5-5 | Cylinder Head Assembly Variant 2, Part Numbers |
| Suction Manifold & Air Cleaner | 6-6 | Intake Manifold, Air Cleaner Assembly, Part Numbers |
| Exhaust Manifold & Silencer | 7-7 | Exhaust Manifold, Muffler, Part Numbers |
| Camshaft & Driving Gear | 8-8 | Camshaft, Drive Gear, Tappets, Part Numbers |
| Crankshaft & Piston | 9-9 | Crankshaft, Piston Assembly, Connecting Rod, Part Numbers |
| Lub.Oil System | 10-11 | Lubrication Oil Pump, Oil Filter, Piping, Part Numbers |
| Cooling Water System | 12-13 | Water Pump, Thermostat, Cooling Passages, Part Numbers |
| Radiator | 14-15 | Radiator Assembly, Hoses, Cooling Fan, Part Numbers |
| Fuel Injection Pump | 16-17 | Injection Pump Assembly, Plunger, Delivery Valve, Part Numbers |
| Governor | 18-19 | Governor Assembly, Control Lever, Springs, Part Numbers |
| Fuel Injection Valve | 20-20 | Injector Nozzle, Nozzle Holder, Spring, Part Numbers |
| Fuel Filter | 21-21 | Fuel Filter Assembly, Sediment Bowl, Part Numbers |
| Engine Control Device | 22-22 | Throttle Control, Stop Lever, Linkage, Part Numbers |
| Starting Motor (Standard) | 23-25 | Starter Motor Standard, Drive Pinion, Brushes, Part Numbers |
| Starting Motor (Cold District) | 26-28 | Cold District Starter Motor, Pre-Heater, Part Numbers |
| Generator | 29-29 | Alternator Assembly, Charging System, Part Numbers |
| Panel | 30-31 | Instrument Panel, Gauges, Switches, Part Numbers |
| Gasket Set | 32-32 | Full Gasket Set, Head Gasket, Seal Kit, Part Numbers |
| Starting Motor (Cold District) | 33-33 | Cold District Starter Motor Inner Parts, Brushes, Armature, Part Numbers |
Yanmar 3TNE84-SA / G1A / G2A / C-G1A Common Problems This Manual Covers
Hard starting after injector work
Owners report rough running and heavy unburned fuel after fitting reconditioned injectors. The Fuel Injection Valve section lists the nozzle assembly, nozzle case nut, and injection pipes so you can replace suspect components with correct new parts instead of chasing a bad recon.
Manual Section: Fuel Injection Valve p. 20Fuel starvation from a clogged filter
A restricted element or air pulled past a tired O-ring makes any small diesel stumble under load. The Fuel Filter section covers the strainer assembly, element, cup, and O-rings for a clean fuel-side refresh.
Manual Section: Fuel Filter p. 21Compression loss past the head gasket
Gasket and seal failures causing compression loss or leakage are a known trouble spot on this engine family. The Gasket Set section identifies the full set so nothing gets reused during reassembly.
Manual Section: Gasket Set p. 32Starter drags or fails to engage
The starter is one of the most replaced parts on these engines. The Starting Motor (Standard) section breaks the unit down for ordering, and a separate cold-district version is cataloged as well.
Manual Section: Starting Motor (Standard) p. 23Low oil pressure at idle
A worn oil pump, blocked filter, or failed pressure switch will light the warning long before a bearing lets go. The Lub.Oil System section lists the lube oil pump assembly, 80x80L filter, oil cooler assembly, dipstick, and switch.
Manual Section: Lub.Oil System p. 10Water pump weep and worn belts
Coolant seeping from the pump and a glazed, cracked V-belt are routine finds at service time. The Cooling Water System section covers the cooling water pump, V-belt, fan, and related hardware.
Manual Section: Cooling Water System p. 12Surging or hunting at governed speed
An engine that hunts under steady load often has wear in the governor linkage. The Governor section lists the weight assembly, links, control shaft assembly, and governor lever assembly so worn pieces can be identified and replaced individually.
Manual Section: Governor p. 18Frequently Asked Questions
Which engine models does this parts catalog cover?
It covers four variants of the Yanmar 3TNE84 diesel engine: 3TNE84-SA, 3TNE84-G1A, 3TNE84-G2A, and 3TNE84C-G1A. It is the factory parts publication Y00R4471, and it applies to the engine itself regardless of what equipment it is installed in.
Does it include repair procedures or torque specs?
No. This is a parts catalog: its job is identifying every component by system, from cylinder block through gasket set, so you order the right parts. For clearances, valve lash, and head torque sequences you would pair it with a service manual.
How well is the fuel system covered?
In detail. The Fuel Injection Pump section lists the pump assembly, plunger with barrel, control rack, camshaft, and tappet assembly, and separate sections cover the Governor, Fuel Injection Valve, and Fuel Filter. That is the whole path from tank to nozzle. p. 16
Is a cold-climate starting motor listed?
Yes. The Starting Motor (Cold District) section begins on page 26, alongside the standard starting motor section, with cold-district inner parts detailed on page 33. Useful when your engine carries the winterized starter rather than the standard unit. p. 26
What format is the Yanmar 3TNE84 parts catalog?
This is a 33-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.
Is the Yanmar 3TNE84 parts catalog printable?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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