Part of the Yanmar Parts Manuals.
Somewhere between the teardown bench and the parts counter is where a 4TNE84T rebuild usually stalls: you know exactly which piece failed, but not the number Yanmar printed on it. This catalog settles that. Publication Y00R4551 is the factory parts book for the Yanmar 4TNE84T-SA, 4TNE84T-G1A, and 4TNE84T-G2A turbocharged diesels, 34 pages of exploded assemblies keyed to genuine part numbers.
Coverage runs from the cylinder block, cylinder head, crankshaft, and pistons through the camshaft and gear train to the turbocharger, the lube oil and cooling water systems, fuel injection valves and nozzles, the fuel strainer, governor and regulator linkage, starter, generator, wiring harness and instrument panel, and the full gasket set.
Every day the engine sits apart waiting on a part that came back wrong is a day you do not get back. Download the PDF, find the assembly, pull the exact number, and order once.
What's Inside This Yanmar 4TNE84T-SA / G1A / G2A Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Parts Number Index | 1 | Master Part Number Reference List |
| Cylinder Block | 4-5 | Block Assembly, Cylinder Bore |
| Gear Housing & Flywheel | 6-8 | Gear Train, Flywheel Housing |
| Cylinder Head & Bonnet | 9-12 | Head Assembly, Valves, Bonnet |
| Camshaft & Driving Gear | 13-14 | Camshaft, Timing Drive |
| Crankshaft & Piston | 15-16 | Crankshaft, Connecting Rod, Piston |
| Turbocharger Assembly | 17 | Turbocharger (Tc) Parts |
| Lub. Oil System | 18-19 | Oil Pump, Oil Filter, Oil Strainer |
| Cooling Water System | 13 | Water Pump, Impeller, Housing, Seal |
| Fuel Injection System | 22 | Valve Assy F.INJECT, Nozzle Assy, Holder Assy, Injection Pipe |
| Fuel Strainer Assembly | 23 | Strainer Assy, Element (Fuel), Cup (Strainer), Taper Valve |
| Governor Assembly | 24 | Link, Governor, Regulator Assy, Shaft, Driving Gear |
| Starting Motor (Type a) | 25-26 | Starter Assy, Armature, Clutch Assy, Pinion, Switch Assy |
| Starting Motor (Type B) | 27-29 | Alternate Starter, Armature, Clutch, Pinion, Switch Assy |
| Generator (Alternator) | 30 | Rotor Assy, Stator Assy, Brush Assy, Regulator, V-Belt |
| Electrical & Wiring Harness | 31-32 | Harness, Wire, Instrument Panel, Thermometer, SA/G1A/G2A Variants |
| Gasket Set | 33 | Gasket Set (Non-Asb.), CYL.HEAD Gasket, Valve Stem Seals, O-Rings, Nozzle Protector |
| Miscellaneous & Labels | 34 | Labels, Miscellaneous Hardware |
Yanmar 4TNE84T-SA / G1A / G2A Common Problems This Manual Covers
Black smoke under load
A starved intake overfuels the cylinders and shows up as black exhaust long before power loss does. Check the air cleaner element and intake tract first; the parts for the whole intake side are broken down in the Suction Manifold & Air Cleaner section.
Manual Section: Suction Manifold & Air Cleaner p. 6Overheating and coolant loss
These engines run hot when cooling passages clog or the pump stops moving water, and owners report overheating as one of the most common failures. The Cooling Water System section identifies every numbered part on the water side so you replace the failed piece, not the whole circuit.
Manual Section: Cooling Water System p. 15Blue smoke and rising oil consumption
Blue exhaust points to oil getting past worn rings or into the chamber from below. Once the bores are measured and the verdict is in, the Crankshaft & Piston section gives you the numbers for pistons and related bottom-end parts by assembly.
Manual Section: Crankshaft & Piston p. 12Low oil pressure
A lazy gauge at operating temperature usually traces to the oil pump, relief valve, or a starved pickup rather than bearings alone. The Lub.Oil System section maps the pressure circuit part by part so you can order what the inspection actually condemns.
Manual Section: Lub.Oil System p. 13White smoke or coolant in a cylinder
Steady white exhaust on a warm engine means coolant is finding its way into the combustion chamber, and the head has to come off to prove where. The Cylinder Head & Bonnet section covers the head hardware you will be handling once it is on the bench.
Manual Section: Cylinder Head & Bonnet p. 4Turbocharger seal leaks and boost loss
Oil weeping from either end of the turbo, or a noticeable drop in boost, means the unit needs to come apart or come off. Two dedicated sections break the turbocharger down; the first starts on page 9.
Manual Section: Turbocharger (1) p. 9Frequently Asked Questions
Which Yanmar engines does this parts catalog cover?
Three variants of the 4TNE84T turbocharged diesel: the 4TNE84T-SA, 4TNE84T-G1A, and 4TNE84T-G2A. It is Yanmar publication Y00R4551, and part listings are organized by engine assembly across all three models.
Is this a service manual with torque specs and procedures?
No. This is the factory parts catalog: exploded assembly views with genuine Yanmar part numbers for identification and ordering. It does not contain disassembly procedures, clearances, or torque values, so pair it with a service manual when you rebuild.
Does it cover fuel injection and fuel filter parts?
Yes. Injection valve and nozzle assemblies, nozzle holders, and fuel injection pipes are listed starting on page 22, followed by the fuel strainer assembly, taper valve, element, and strainer cup on page 23. p. 22
Are starter and charging system parts included?
Yes. Starter assemblies are broken down to armature, clutch, pinion, switch assembly, and housing starting on page 25, and the generator section on page 30 lists the rotor, stator, brush assembly, regulator, pulley, adjuster, and V-belt. p. 25
Will this Yanmar 4TNE84T-SA Parts Catalog download right away?
A 34-page Parts Catalog in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Am I free to print this Yanmar 4TNE84T-SA Parts Catalog?
Yes — the PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works fine.
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