Part of the Yanmar Parts Manuals.
An engine in pieces on a stand is only half a rebuild; the other half is knowing exactly which part number goes on the order. This Yanmar parts catalog exists for that moment. It covers the 4TNE98-NMH diesel built to the NACCO specification, publication 0CW10-G01400, issued in 2005.
Across 25 pages and 18 bookmarks it works through the engine section by section: Cylinder Block, Crankshaft & Piston, Camshaft & Driving Gear, Lub.Oil System, Cooling Water System, Fuel Injection Pump, Fuel Injection Valve, Fuel Filter, Starting Motor, Generator, and the complete Gasket Set. Service sizes are listed where they matter, including 0.25 mm undersize main bearings and 0.25 mm oversize piston rings.
Download the PDF, open the section you have apart on the bench, and order the correct bush, metal set, or gasket the first time instead of guessing across a parts counter.
What's Inside This Yanmar 4TNE98-NMH (Nacco) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Preface. | 2-3 | - |
| Content. | 4 | - |
| Cylinder Block | 5 | Cylinder Block Assy, Camshaft Bush, Main Bearing Set, Thrust Bearing Assy, Head Gasket |
| Gear Housing | 6 | Gear Case Cover Assy, Oil Seal, Fuel Injection Pump Cover, Filler Cover, Gear Case, Lub. Oil Pump Assy, Liquid Gasket |
| Oil Sump | 7 | Oil Sump Assy, Liquid Gasket, Oil Seal Case Assy, Oil Seal N Case Assy, Seal HTC95 |
| Cylinder Head & Bonnet | 8 | Engine Lifter, Cylinder Head Assy, Suction Valve, Exhaust Valve, Valve Spring, Spring Retainer, Valve Stem Seal, Valve Cap |
| Suction & Exhaust Manifold | 9 | Suction Manifold Gasket, Int Manifold, Exhaust Manifold, Gasket, Joint |
| Camshaft & Driving Gear | 10 | Tappet, Push Rod, Camshaft Assy, Thrust Metal, Camshaft Gear, Idler Shaft, Idle Gear Assy, Idle Gear Bush |
| Crankshaft & Piston | 11 | Crankshaft Comp, Crankshaft Gear, V-pulley, Piston Assy, Ring Set, Connecting Rod Assy, Piston Pin Bush, Crankpin Metal Assy |
| Lub.Oil System | 12 | Dipstick, Dipstick Guide, Filter 80X80L, Lub. Oil Pipe Assy, Lub. Oil Switch |
| Cooling Water System | 13 | Cooling Water Pump V-pulley, V-belt A: Inch, Thermostat Gasket, Thermostat Cover, Gasket, Thermostat, Cooling Water Pump Gasket, Cooling Water Pump Pipe |
| Fuel Injection Pump | 14-16 | Axel Wire Bracket, Retainer, Bracket Stay, Fuel Oil Pump Assy |
| Fuel Injection Valve | 17 | Injection Valve Assy, Nozzle Assy, Retainer, Fuel Injection Pipe No, F.o.return Pipe Assy, Fuel Return Pipe, Return Gasket |
| Fuel Filter | 18 | Fuel Oil Filter, Sub. Assy Body, Lebel Censor Assy, Element Kit, Filter, Fuel Pipe, Fuel Oil Strainer |
| Starting Motor | 19 | Starter, Armature Assy, Field Coil Assy, Brush, Brash Holder Assy, Rear Cover, Magnetic Switch Assy, Shift Lever Set |
| Generator | 20 | 12V-60A Generator, Pulley, Frame Assy, Plate, Rotator Assy, Bearing Cover, Flame, Brush Holder |
| Gasket Set | 21 | Head Gasket, Valve Stem Seal, Nozzle Protecter, Nozzle Gasket, Bonnet Gasket, Suction Manifold Gasket, Cooling Water Pump Gasket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Starter Power | 2.3KW | p. 19 |
| V-Belt Size | A:45 inch | p. 13 |
| Starter Motor Power | 2.3 kW | p. 19 |
| Generator Voltage | 12 V | p. 20 |
| Generator Current | 60 A | p. 20 |
| Main Bearing Undersize | 0.25 mm | p. 11 |
| Piston Ring Set Oversize | 0.25 mm | p. 11 |
| Thrust Bearing Oversize | 0.25 mm | p. 11 |
Yanmar 4TNE98-NMH (Nacco) Common Problems This Manual Covers
Cranks but will not fire
Fuel starvation from a plugged filter or water in the fuel is the usual reason a 4TNE98 spins over without lighting. The Fuel Filter section lists the element kit, filter body, and related pipes so you can renew the whole supply path, not just the cartridge.
Manual Section: Fuel Filter p. 18Rough running and power loss
Contaminated fuel eventually tells on the injection pump, showing up as smoke, hunting, and lost power. The Fuel Injection Pump section identifies the pump assembly, feed pump, cam disk, piston, and delivery valve so a worn pump can be repaired or replaced with the correct numbers.
Manual Section: Fuel Injection Pump p. 14Overheating after short running
An engine that runs hot within half an hour usually needs a thermostat or water pump. The Cooling Water System section lists the water pump assembly, thermostat, gasket, V-pulley, and the A:45 inch V-belt for this engine.
Manual Section: Cooling Water System p. 13Low oil pressure warning
A flickering oil light means checking the switch, filter, and supply before condemning the bearings. The Lub.Oil System section covers the dipstick, oil filter, pressure switch, and lube oil pipe assembly with their part numbers.
Manual Section: Lub.Oil System p. 12Slow or dead cranking
When the battery checks good and cranking is still lazy, the 2.3 kW starter is next in line. The Starting Motor section breaks it down to armature, field coil, magnetic switch, and pinion assembly, so you can rebuild the unit instead of replacing it whole.
Manual Section: Starting Motor p. 19Charging system not keeping up
A battery that will not stay up points at the 12 V, 60 A generator or its belt and regulator. The Generator section lists the pulley, frame and rotator assemblies, regulator, belt, and adjuster.
Manual Section: Generator p. 20Worn crank and bores at rebuild
Once the crank is measured and the journals need grinding, you need the service sizes before ordering. The Crankshaft & Piston section lists 0.25 mm undersize main bearings, 0.25 mm oversize piston ring sets, and 0.25 mm oversize thrust bearings alongside the standard connecting rod and crankpin metals.
Manual Section: Crankshaft & Piston p. 11Frequently Asked Questions
Which engine does this parts catalog cover?
The Yanmar 4TNE98-NMH diesel built to the NACCO specification, publication number 0CW10-G01400, issued 2005. It is the engine-only catalog, so it applies whatever equipment the engine is installed in. The catalog is in English and runs 25 pages.
Does it include torque specs or repair procedures?
No. This is a parts catalog: it identifies every component by factory part number, section by section, from Cylinder Block through Gasket Set. Use it alongside a service manual for clearances, valve lash, and torque sequences; use this book to order the parts those jobs call for.
Does it list undersize and oversize rebuild parts?
Yes. The Crankshaft & Piston section lists 0.25 mm undersize main bearing metals, 0.25 mm oversize piston ring sets, and 0.25 mm oversize thrust bearings, along with the piston, connecting rod, and crankpin metal assemblies. p. 11
How is the fuel system covered?
Three sections handle it. Fuel Injection Pump covers the pump, feed pump, drive shaft, cam disk, and delivery valve. Fuel Injection Valve lists the injector and nozzle assemblies with the injection and fuel return pipes, and Fuel Filter lists the filter body and element kit. p. 14
How quickly can I access this manual after buying?
Instant PDF download. You get the full 25-page searchable Parts Catalog immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print this Yanmar 4TNE98-NMH manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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