Part of the Yanmar Parts Manuals.
An engine apart on the stand generates a parts list fast: eighteen cylinder head studs to inspect, a gasket set to price, a thermoswitch you suspect is not original. This catalog puts a Yanmar part number on every one of those pieces before you place the order.
It is Yanmar publication Y00R4440, the factory parts catalog for the 4TNE84-SA, 4TNE84-G1A and 4TNE84-G2A diesel engines. Twenty five pages of exploded views run the engine end to end: Cylinder Block, Cylinder Head & Bonnet, Camshaft & Driving Gear, Crankshaft & Piston, the lube oil and cooling water systems, then the fuel injection pump, governor, injection valves and filter, through to starting motor, generator and panel.
Ordering a bearing or seal by guesswork is how a rebuild stalls for two weeks waiting on the wrong part. Match the diagram, read the number, and everything is on the bench when the engine goes back together.
What's Inside This Yanmar Yanmar 4TNE84-SA/G1A/G2A Series Parts Manual
| System | Pages |
|---|---|
| Cylinder Block | 1 |
| Gear Housing | 2 |
| Flywheel Housing & Oil Sump | 3 |
| Cylinder Head & Bonnet | 4-6 |
| Suction Manifold & Air Cleaner | 7 |
| Exhaust Manifold & Silencer | 8 |
| Camshaft & Driving Gear | 9 |
| Crankshaft & Piston | 10 |
| Lub.Oil System | 11 |
| Cooling Water System | 12-13 |
| Radiator | 14 |
| Fuel Injection Pump | 15-16 |
| Governor | 17 |
| Fuel Injection Valve | 18 |
| Fuel Filter | 19 |
| Engine Control Device | 20 |
| Starting Motor | 21-22 |
| Generator | 23 |
| Panel | 24 |
| Gasket Set & Tool | 25 |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Thermal switch activation temperature | 110 C | p. 13 |
| Cylinder Head Stud Quantity | 18 | p. 4 |
| Thermoswitch Activation Temperature | 110 C | p. 13 |
Yanmar Yanmar 4TNE84-SA/G1A/G2A Series Common Problems This Manual Covers
Hard starting from a starved fuel system
Clogged filters and water in the fuel are the usual reason a 4TNE84 cranks but will not light off. When bleeding does not fix it, the Fuel Filter section identifies the element and housing parts to replace rather than reuse.
Manual Section: Fuel Filter p. 19Overheating and coolant loss
Worn pumps, tired hoses and blocked passages show up as a climbing temperature gauge and coolant on the floor. The Cooling Water System pages break out the circuit, including the thermoswitch that activates at 110 C, so you can order the failed piece by number.
Manual Section: Cooling Water System p. 12Contaminated fuel damaging the injection pump
Dirty fuel wears the pump internals and leads to rough running and power loss. The Fuel Injection Pump section gives the exploded view and part numbers you need when the pump comes off for service or replacement.
Manual Section: Fuel Injection Pump p. 15Blue smoke and rising oil consumption
Oil burning points to worn rings or cylinder wear, and that means a bottom-end teardown. The Crankshaft & Piston section identifies pistons, rings and crankshaft components so the parts order matches what you find at measurement.
Manual Section: Crankshaft & Piston p. 10Low oil pressure warnings
Once oil level and grade are ruled out, low pressure usually traces to pump or circuit wear. The Lub.Oil System section lays out the lubrication components so you can identify exactly what to renew before bearings pay the price.
Manual Section: Lub.Oil System p. 11Starter drags or fails to engage
A slow or silent starter on a cold morning is a common 4TNE84 complaint. The Starting Motor pages cover both the standard and cold district starters, so you can identify the correct unit and its hardware for your build.
Manual Section: Starting Motor p. 21Leaks after reassembly on old gaskets
Reusing crushed gaskets and hardened seals is how a fresh rebuild ends up weeping oil and coolant. The Gasket Set & Tool page identifies the full set to order once, instead of chasing individual seals mid-assembly.
Manual Section: Gasket Set & Tool p. 25Frequently Asked Questions
Which Yanmar engines does this parts catalog cover?
It covers the Yanmar 4TNE84-SA, 4TNE84-G1A and 4TNE84-G2A engine models. It is factory publication Y00R4440, and all three variants are covered in the one 25 page document.
Is this a workshop manual with torque specs and repair procedures?
No. This is the parts catalog: exploded diagrams and Yanmar part numbers for every system, from Cylinder Block through Gasket Set & Tool. It tells you what to order, not how to set valve lash or torque the head. Pair it with a service manual for clearances and procedures.
Does it cover the fuel injection system in detail?
Yes. The Fuel Injection Pump section starts on page 15, with separate sections for the Governor, Fuel Injection Valve and Fuel Filter, so pump, injector and filter parts each have their own exploded view and part listing. p. 15
Can I identify cooling system parts like the thermoswitch from it?
Yes. The Cooling Water System section begins on page 12 and includes the thermoswitch, which activates at 110 C. The Radiator has its own section on page 14, so overheating repairs on any of the three variants can be ordered by part number. p. 12
What format is this manual in?
A 25-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 able to print pages from this Yanmar 4TNE84-SA 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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