All 25 pages of the Yanmar 4TNE84 Parts Catalog (OEM #Y00R4440) map the complete engine family: SA, G1A, and G2A variants, from cylinder block to panel assembly, with every component numbered and positioned. Inside, you get factory exploded views for every major assembly: cylinder head, crankshaft and piston, fuel injection pump, governor, cooling water system, starting motor (both standard and cold-district), and generator. Part numbers are tied directly to illustrated diagrams, so you're matching the right component to the right position before you ever pick up a phone. The cooling circuit calls out the thermal switch activation point at 110 C, confirming this is genuine Yanmar factory data, not a third-party guess. Order the wrong part once and you know exactly what it costs. Jump to any system with bookmarks, search by keyword, and get the right number the first time.
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
Yanmar 4TNE84-SA fuel filter element part numbers needed for service order p. 19
Check the fuel system parts list on page 19 for the fuel filter element. It is itemized separately in the exploded view with an individual item number. Confirm your model suffix (SA, G1A, or G2A) against the serial number range column before placing the order, since part numbers can differ between variants.
Manual Section: Fuel System PartsWater pump impeller and thermostat part numbers for cooling system overhaul, model variants unclear p. 12
Open the cooling system parts list on page 12. Water pump assembly, impeller, and thermostat are each broken out with separate item numbers in the exploded view. Match those item numbers to the adjacent parts list for exact part numbers. If the thermoswitch is also being replaced, it activates at 110°C; confirm that temperature rating against your application before ordering.
Manual Section: Cooling System PartsCylinder head gasket set and head stud part numbers unclear for complete engine rebuild p. 1
Reference the engine parts diagram on page 1 for the full cylinder head assembly breakdown. The cylinder head uses 18 studs (page 4); match each stud item number to the parts list for the correct part numbers. Head gasket, valve stem seals, and related hardware are itemized separately; identify each item number before building your rebuild order.
Manual Section: Engine Parts DiagramFuel injection nozzle and injection pump part numbers for rough-running diagnosis, three variants listed p. 15
Turn to the fuel system exploded view on page 15. Injection nozzles and the injection pump are itemized separately with individual item numbers. Cross-reference your model suffix (SA, G1A, or G2A) and the serial number range column in the parts list before ordering. Injection components are often variant-specific and part numbers do not cross between all three models.
Manual Section: Fuel System PartsThermostat housing seal and cooling hose part numbers needed after finding coolant leak around housing p. 12
Go to the cooling system parts on page 12. The thermostat housing breaks down into individual item numbers for the housing body, seals, and o-rings; cooling hoses are listed separately. Match each item number to the adjacent parts list and pull all seal and hose part numbers together before ordering to cover the complete repair in one shipment.
Manual Section: Cooling System PartsFrequently Asked Questions
What are the replacement specifications for fuel filters?
For replacement, the fuel filter strainer assembly is part number 129100-55621 (Ref. 1), and the fuel filter element is part number 129100-55650 (Ref. 4). These parts are listed under the '16. FUEL FILTER' section of the manual.
What are the replacement specifications for air filter?
For air filter replacement, the air cleaner assembly is part number 129608-12500 (Ref. 18), and the outer element is part number 119808-12520 (Ref. 20). These components are detailed in the '6. SUCTION MANIFOLD & AIR CLEANER' section of the manual.
How do you fix yanmar 4TNE84-SA fuel filter element part numbers needed for service order?
Check the fuel system parts list on page 19 for the fuel filter element. It is itemized separately in the exploded view with an individual item number. Confirm your model suffix (SA, G1A, or G2A) against the serial number range column before placing the order, since part numbers can differ between variants.
How do you fix water pump impeller and thermostat part numbers for cooling system overhaul, model variants unclear?
Open the cooling system parts list on page 12. Water pump assembly, impeller, and thermostat are each broken out with separate item numbers in the exploded view. Match those item numbers to the adjacent parts list for exact part numbers. If the thermoswitch is also being replaced, it activates at 110°C; confirm that temperature rating against your application before ordering.
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.
Can I print specific sections of this Yanmar 4TNE84-SA, 4TNE84-G1A, 4TNE84-G2A?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Document Quality
This document is a scanned PDF, providing an OCR layer that allows you to search and copy the full text. The text throughout is generally crisp and readable. Diagrams and illustrations are scanned raster images; their labels are readable, but the images will pixelate if zoomed in significantly. Pages are clean with minimal scan artifacts and some slight skewing, but there are no notable stains or marks. There are no blank or filler pages present in the document.
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