Part of the Yanmar Parts Manuals.
The injection pump internals are where a 4TNV98T parts order goes wrong: plungers, delivery valves, and governor components differ between the GGE build and the NSA and NSA2 builds, and guessing costs you the wrong element and a second teardown. This Yanmar parts catalog, publication Y00R5680-1, keeps the variants separate, with dedicated inner parts sections for each.
The rest of the 35 pages runs the whole engine, system by system: cylinder block, cylinder head, camshaft, crankshaft and piston, turbocharger, lubrication and cooling, fuel injection valve, starter, alternator, and the complete gasket set. Real numbers come straight off the tables, oil filter 123907-55800, air cleaner element 129935-12520, so you order once.
It downloads as a bookmarked English PDF, small enough at 0.78 MB to keep on a phone at the bench, and each of the 24 bookmarks drops you on the section you need while the engine is still on the stand.
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
Hard starting after the engine sits
A 4TNV98T that needs cranking forever after a night parked usually has air getting into the fuel or a fouled filter. The Fuel Lines section lays out the fuel filter, return lines, and bleeding screw so you can replace the suspect pieces instead of chasing the leak by eye.
Manual Section: Fuel Lines p. 20Overheating and coolant loss
Coolant weeping around the pump housing and a temperature gauge that climbs under load are common complaints on these engines. The Cooling Water System section identifies the water pump, thermostat, and hoses by part number for a proper refresh rather than a parts-counter guess.
Manual Section: Cooling Water System p. 17Oil leaks at the sump and seals
Oil tracking back from the flywheel end or seeping at the pan gasket means seals, and the sump hardware differs between the NSA/NSA2 and GGE builds. This section splits them so the oil pan, drain plug, and oil seal you order actually fit your variant.
Manual Section: Flywheel Housing & Oil Sump (NSA/NSA2 & GGE variants) p. 6Black smoke from tired injector nozzles
Black smoke, rough running, and lost power on a turbo diesel often trace back to worn nozzle tips. The Fuel Injection Valve section lists the injection valve, nozzle holder, and nozzle tip so you can renew all four holes with matching parts.
Manual Section: Fuel Injection Valve p. 19Turbocharger losing boost or passing oil
A lazy turbine or oil in the intake tract calls for turbocharger parts, not hope. The Turbocharger (Turbine) section covers the turbine assembly and boost control components for this engine.
Manual Section: Turbocharger (Turbine) p. 13Starter clicks but will not crank
When the solenoid clacks and nothing turns, the fix is usually inside the starter. The Starting Motor section breaks out the solenoid, drive pinion, and ring gear so you can repair the unit instead of replacing it whole.
Manual Section: Starting Motor p. 21Sourcing every gasket for an overhaul
Reassembling with one reused gasket is how a fresh rebuild ends up back on the stand. The Gasket Set section gives the complete gasket set, overhaul kit, and seal set numbers so everything arrives in one order before you torque anything down.
Manual Section: Gasket Set p. 23Frequently Asked Questions
Which Yanmar engine variants does this parts catalog cover?
It covers the 4TNV98T-GGE, 4TNV98T-NSA, and 4TNV98T-NSA2 diesel engines. Where the builds differ, the catalog carries separate sections, including gear housing, flywheel housing and oil sump, and the injection pump and governor inner parts, so you always read the column for your engine.
Is this a service manual with torque specs and clearances?
No. This is the factory parts catalog, publication Y00R5680-1: part numbers, assemblies, and quantities for ordering replacement parts. It does not contain repair procedures, torque values, or adjustment data, so pair it with a service manual for the actual rebuild work.
Does it list filter part numbers for routine service?
Yes. The Lubrication Oil System section lists the oil filter as 123907-55800, and the Engine Foot & Air Cleaner section lists the air cleaner 129933-12500 with outer element 129935-12520, so stocking service parts takes minutes. p. 15
Are the fuel injection pump and governor internals included?
Yes, down to plungers, delivery valves, and pump elements. The NSA and NSA2 engines get their own Fuel Injection Pump Inner Parts section, and the GGE has a separate section for its pump and governor internals with speed control parts. p. 24
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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