Part of the Yanmar Parts Manuals.
All 35 pages of this Yanmar 4TNV98T Parts Catalog (OEM #Y00R5680-1) map every serviceable component across three engine variants: the 4TNV98T-GGE, 4TNV98T-NSA, and 4TNV98T-NSA2 diesel engines. You get exploded views and factory part numbers for every major assembly: cylinder block, crankshaft and piston, gear housing, flywheel housing, turbine, fuel injection pump inner parts, governor inner parts, and electrical components including the starting motor and generator. Variant-specific sections break out GGE and NSA/NSA2 configurations separately for gear housing, flywheel housing, oil sump, fuel injection pump, and governor, so your cross-references stay clean. Each assembly calls out individual piece-part numbers, down to the 8x16mm parallel pin and 6x12mm spring pin used across multiple housings. Stop ordering the wrong part. Bookmarked sections let you jump straight to any assembly by system, pull the correct part number on your phone, and put the right piece on order before you close the hood.
What's Inside This Yanmar 4TNV98T-GGE / NSA / NSA2 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 3-3 | Block Assy, Main Bearings, Plugs, Head Bolts, Head Gasket |
| Gear Housing (NSA/NSA2 & GGE Variants) | 4-5 | Gear Case Cover, Oil Seal, Oil Pump Assy, Ball Bearing, O-Rings, Tachometer Gear |
| Flywheel Housing & Oil Sump (NSA/NSA2 & GGE Variants) | 6-7 | Flywheel Housing, Oil Pan Assy, Drain Plug, Oil Seal |
| Cylinder Head & Bonnet | 8-9 | Cylinder Head Assy, Bonnet, Valves, Rocker Arm, Injector Nozzle Holder |
| Suction Manifold | 10-10 | Intake Air |
| Exhaust Manifold | 11-11 | Gasket, Heat Shield |
| Camshaft & Driving Gear | 12-12 | Camshaft Assy, Driving Gear, Cam Followers, Timing |
| Turbocharger (Turbine) | 13-13 | Turbocharger, Turbine Assy, Boost Control |
| Crankshaft & Piston | 14-14 | Crankshaft Assy, Piston, Connecting Rod, Main Bearings, Rings |
| Lubrication Oil System | 15-15 | Oil System, Oil Filter 123907-55800, Separator 119802-55700, Element 119802-55710 |
| Lubrication Oil Lines | 16-16 | Oil Lines, Cooler Hose, Oil Pressure |
| Cooling Water System | 17-17 | Water Pump, Thermostat, Coolant Hoses, Water Jacket |
| Fuel Injection Pump | 18-18 | Fuel Injection Pump Assy, Fuel Feed Pump, Injection Timing |
| Fuel Injection Valve | 19-19 | Injection Valve, Nozzle Holder, Nozzle Tip |
| Fuel Lines | 20-20 | Fuel Filter, Return Lines, Bleeding Screw |
| Starting Motor | 21-21 | Starter Motor, Solenoid, Drive Pinion, Ring Gear |
| Generator (Alternator) | 22-22 | Alternator, Regulator, Belt Tension |
| Gasket Set | 23-23 | Complete Gasket Set, Overhaul Kit, Seal Set |
| Fuel Injection Pump Inner Parts (NSA/NSA2) | 24-25 | Governor Inner Parts, Plunger, Delivery Valve, Pump Element |
| Fuel Injection Pump Inner Parts (GGE) & Governor | 26-27 | Governor Inner Parts GGE, Speed Control, Plunger Element |
| Engine Foot & Air Cleaner | 29-30 | Engine Foot Mounting, Air Cleaner 129933-12500, Outer Element 129935-12520 |
| Exhaust & Silencer | 31-32 | Exhaust Manifold Option, Silencer, Tall Pipe, Muffler |
| Oil Cooler & Radiator | 33-34 | Oil Cooler, Radiator, Cooling Circuit |
| Electric Parts | 35-35 | Electrical Components, Wiring Connectors, Sensors |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| SPRING PIN dimensions | 6x12 mm (implied) | p. 3 |
| PARALLEL PIN dimensions | 8x16 mm (implied) | p. 4 |
| PACKING 3075 dimensions | 3075 (dimension, mm implied) | p. 4 |
Yanmar 4TNV98T-GGE / NSA / NSA2 Common Problems This Manual Covers
Yanmar 4TNV98T glow plug part number lookup for cold-start no-crank diagnosis p. 21
Check the electrical parts list on page 21. Locate the glow plug in the exploded view and note the part number listed for your specific model variant (GGE, NSA, or NSA2). Confirm quantity per cylinder before ordering. Cross-reference the parts number list on page 3 to verify the correct replacement matches your engine serial number range.
Manual Section: 018.Pdf: Electrical PartsFuel filter and fuel-water separator part numbers needed, engine stalling after sitting overnight p. 18
Turn to the fuel parts section on page 18. Identify the fuel filter element and fuel-water separator in the exploded view, then record the part numbers listed for your model. The parts number index on page 3 lists all fuel system components. Order both the filter and separator as a set since they share the same service interval and contamination event.
Manual Section: 015.Pdf: Fuel PartsCooling system overheating, need water pump and thermostat housing seal part numbers p. 17
Open the cooling parts diagram on page 17. Locate the water pump assembly, thermostat housing, and associated gaskets and seals in the exploded view. Record each part number individually since housing gaskets and pump seals are listed as separate line items. Verify your model suffix (GGE vs NSA/NSA2) against the quantity columns before placing an order, as fitment may differ between variants.
Manual Section: 014.Pdf: Cooling PartsOil leak diagnosis, need gasket and seal part numbers for gear housing and oil sump area p. 4
Reference page 4 for the gear housing and flywheel housing exploded view covering all three model variants. The NSA and NSA2 housing seals are listed separately from the GGE column. Identify the oil seal (listed as SEAL, OIL) and packing part numbers in the diagram. Cross-check page 6 for the F.I. pump cover seal listed as part of the Cover Assy, Gear Case section.
Manual Section: 002.Pdf: Gear Housing & Flywheel HousingAir filter housing or intake parts identification for black smoke and low power troubleshooting p. 14
Locate the engine parts diagram on page 14. Find the intake and air filter assembly components in the exploded view and record the part numbers for the filter element and any housing seals. Check the parts number list on page 3 to confirm part numbers apply to all three model variants or are model-specific before ordering.
Manual Section: 011.Pdf: Engine Parts DiagramCylinder head valve bridge and camshaft parts identification for internal inspection teardown p. 11
Turn to page 11 for the exhaust and cylinder head parts section. The exploded view shows the valve bridge assembly, cylinder head, guides, and seat components with individual part numbers. Cross-reference the PARALLEL PIN 10X22 (page 14) if disassembling the camshaft area. Confirm part quantities against the column for your specific model variant before ordering replacement components.
Manual Section: 008.Pdf: Exhaust PartsFrequently Asked Questions
What are the replacement specifications for Fuel filters?
The manual, a parts catalog, provides part numbers for fuel filters. For the fuel oil filter, use part number 123907-55800. If a separator assembly is present, its part number is 119802-55700, and its element is 119802-55710.
What are the replacement specifications for Air filter?
The manual, a parts catalog, provides part numbers for air cleaner components. The complete air cleaner assembly is part number 129933-12500. The outer element for the air cleaner is part number 129935-12520.
How do you fix yanmar 4TNV98T glow plug part number lookup for cold-start no-crank diagnosis?
Check the electrical parts list on page 21. Locate the glow plug in the exploded view and note the part number listed for your specific model variant (GGE, NSA, or NSA2). Confirm quantity per cylinder before ordering. Cross-reference the parts number list on page 3 to verify the correct replacement matches your engine serial number range.
How do you fix fuel filter and fuel-water separator part numbers needed, engine stalling after sitting overnight?
Turn to the fuel parts section on page 18. Identify the fuel filter element and fuel-water separator in the exploded view, then record the part numbers listed for your model. The parts number index on page 3 lists all fuel system components. Order both the filter and separator as a set since they share the same service interval and contamination event.
What format is this Yanmar 4TNV98T Parts Catalog in?
You get a 35-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Is this Yanmar 4TNV98T 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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