All 21 pages of this Yanmar 4TNE98-SA, 4TNE98-G1A Parts Catalog (OEM #Y00R4580) zero in on one job: giving you the exact part numbers and exploded views to identify every component in these diesel engines. Inside, you get assembly diagrams and numbered parts lists covering the full engine: cylinder block, gear housing, flywheel housing and oil sump, cylinder head and bonnet, camshaft and driving gear, crankshaft and piston assembly, fuel injection pump and valve, governor, and feed pump. Every section pairs the diagram with OEM part numbers so cross-referencing a component takes seconds, not minutes of guessing. The cooling water system identifies the thermo switch at its 110°C operating temperature so you order the exact replacement, not a close substitute. Stop hunting part numbers across three browser tabs. Bookmarked and searchable: jump straight to any assembly section and have the right number in hand before you pick up the phone.
What's Inside This Yanmar 4TNE98-SA, 4TNE98-G1A Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 1 | Cylinder Block Assembly, Main Bearings, Camshaft Bushings, Head Bolts, Cylinder Head Gasket |
| Gear Housing | 2 | Gear Housing Cover, Lube Oil Pump, Tachometer Gear Unit, Oil Supply Cap, Seals and O-Rings |
| Flywheel Housing & Oil Sump | 3 | Flywheel Housing, Oil Sump Assembly, Drain Plug, Oil Seal, Flywheel Cover Cap |
| Cylinder Head & Bonnet | 4 | Cylinder Head Assembly, Rocker Arm Shaft, Valve Guides, intake/exhaust Valves, Valve Springs, Nozzle Seats, Bonnet Gasket |
| Suction Manifold | 5 | Intake Manifold, Manifold Gasket, Air Heater, Earth Cord |
| Exhaust Manifold | 6 | Exhaust Gasket, Stud Bolts, Manifold Nuts |
| Camshaft & Driving Gear | 7 | Camshaft Assembly, Tappets, Push Rods, Camshaft Gear, Idle Gear Assembly, Idle Shaft, Fi-P Gear |
| Crankshaft & Piston | 8 | Crankshaft, Flywheel Assembly, Ring Gear, Pistons with Rings, Piston Pins, Connecting Rods, Crankpin Bearings, V-Pulley |
| Lub. Oil System | 9 | Oil Dipstick, Lube Oil Filter 80X80L, Oil Pressure Switch, Lube Oil Pipe, O-Rings, Seal Washers |
| Cooling Water System | 10 | Water Pump, Cooling Water Pipes, Thermostat, Water Temperature Switch, Hoses and Clamps |
| Fuel Injection Pump | 11-12 | Fuel Injection Pump Assembly, Delivery Valves, Plungers, Pump Housing, Fuel Injection Timing |
| Fuel Injection Valve | 13 | Fuel Injection Nozzle, Nozzle Holder, Pressure Spring, Nozzle Cap Nut, Injection Valve Assembly |
| Fuel Line | 14 | Fuel Supply Pipes, Fuel Return Lines, Fuel Filter, Fuel Line Fittings and Joints |
| Engine Stop Device | 15 | Engine Stop Solenoid, Stop Device Assembly, Fuel Shutoff Mechanism |
| Starting Motor | 16 | Starting Motor Assembly, Pinion Gear, Brush Set, Magnetic Switch, Motor Housing |
| Generator | 17 | Alternator Assembly, Rotor, Stator, Voltage Regulator, Generator Mounting Brackets |
| Gasket Set | 18 | Complete Gasket Set, Cylinder Head Gasket, Oil Sump Gasket, Manifold Gaskets, O-Rings and Seal Washers |
| Governor | 19-20 | Mechanical Governor Assembly, Governor Springs, Flyweights, Control Lever, Governor Housing |
| Feed Pump | 21 | Fuel Feed Pump Assembly, Diaphragm, Pump Valves, Priming Handle, Fuel Transfer |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Thermo switch operating temperature | 110 C | p. 10 |
| Plug Size | PT3/8 | p. 1 |
| Spring Pin Size | 6X12 | p. 4 |
| Main Bearing Undersize | 0.25 | p. 1 |
| O-Ring Size | P20 | p. 2 |
| Parallel Pin Size | 8X16 | p. 2 |
| Bolt Size | M10X 70 | p. 3 |
| Drain Plug Size | M22 | p. 3 |
| Nut Size | M8XP1.0 | p. 4 |
| Circlip Size | 18 | p. 4 |
| Oil Filter Size | 80X80L | p. 9 |
| Thermo Switch Temperature | 110 C | p. 10 |
Yanmar 4TNE98-SA, 4TNE98-G1A Common Problems This Manual Covers
Yanmar 4TNE98 engine needs oil filter replacement, correct part number and dimensions unknown p. 9
Check the lubrication system parts list on page 9. The oil filter for this engine is cataloged at size 80X80L; confirm the part number matches your serial number range before ordering. The same page lists O-rings, gaskets, and seal washers needed for a complete filter housing service.
Manual Section: Lubrication System Repair Part IdentificationCylinder head gasket part number unclear, need correct replacement for upcoming engine rebuild p. 4
Turn to page 4 for the cylinder head and bonnet repair parts breakdown. Gaskets, valves, springs, M8XP1.0 nuts, and size-18 circlips are each listed by individual part number. Cross-reference the parts index to confirm fitment against your serial number range, then verify you have every line item before placing the order.
Manual Section: Cylinder Head & Bonnet Repair Part IdentificationCooling system overhaul parts list needed, thermo switch and O-ring part numbers unknown p. 10
Pull up page 10 for the cooling water system repair parts identification. The thermo switch rated at 110°C is cataloged there along with all associated gaskets, O-rings, and drain plugs. Build a complete cooling system order by cross-referencing each part number against your engine's serial number range before purchasing.
Manual Section: Cooling Water System Repair Part IdentificationEngine rebuild underway, oversized piston ring sets and undersized bearing part numbers needed p. 8
Open page 8 for crankshaft and piston repair parts identification. Oversized piston assemblies complete with rings, individual ring sets, and undersized pin bearings are all listed by part number. Cross-reference page 1 where main bearings in 0.25mm undersize are cataloged to complete your bottom-end parts order.
Manual Section: Crankshaft & Piston Repair Part IdentificationGear housing disassembly required, O-ring and parallel pin part numbers and sizes unknown p. 2
Reference page 2 for gear housing repair parts identification. O-rings sized P20 and parallel pins sized 8X16 are cataloged there with individual part numbers. Verify all associated nut and bolt part numbers on the same page before ordering to ensure you have the complete hardware set for reassembly.
Manual Section: Gear Housing Repair Part IdentificationFrequently Asked Questions
How do you fix yanmar 4TNE98 engine needs oil filter replacement, correct part number and dimensions unknown?
Check the lubrication system parts list on page 9. The oil filter for this engine is cataloged at size 80X80L; confirm the part number matches your serial number range before ordering. The same page lists O-rings, gaskets, and seal washers needed for a complete filter housing service.
How do you fix cylinder head gasket part number unclear, need correct replacement for upcoming engine rebuild?
Turn to page 4 for the cylinder head and bonnet repair parts breakdown. Gaskets, valves, springs, M8XP1.0 nuts, and size-18 circlips are each listed by individual part number. Cross-reference the parts index to confirm fitment against your serial number range, then verify you have every line item before placing the order.
How do you fix cooling system overhaul parts list needed, thermo switch and O-ring part numbers unknown?
Pull up page 10 for the cooling water system repair parts identification. The thermo switch rated at 110°C is cataloged there along with all associated gaskets, O-rings, and drain plugs. Build a complete cooling system order by cross-referencing each part number against your engine's serial number range before purchasing.
How do you fix engine rebuild underway, oversized piston ring sets and undersized bearing part numbers needed?
Open page 8 for crankshaft and piston repair parts identification. Oversized piston assemblies complete with rings, individual ring sets, and undersized pin bearings are all listed by part number. Cross-reference page 1 where main bearings in 0.25mm undersize are cataloged to complete your bottom-end parts order.
How will I receive this Yanmar 4TNE98-SA, 4TNE98-G1A Parts Catalog?
Immediate download of the complete 21-page searchable Parts Catalog. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print specific sections of this manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Document Quality
This document is a scanned PDF with an optical character recognition (OCR) layer, allowing you to search and copy the full text content. The OCR-processed text is crisp and easy to read, while text within the original diagrams is rasterized but remains clearly legible. All diagrams and illustrations are raster images, which are generally clear and have readable labels for part identification. The pages are clean, free from significant scan artifacts, stains, or skewed content, and there are no blank or filler pages present.
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