Part of the Yanmar Parts Manuals.
An injection pump comes off a 4TNV98 trailing a dozen small parts you did not plan to replace, and the exploded view in this Yanmar parts catalog is how you put a part number to every one of them. The same treatment runs through the whole engine: cylinder block, cylinder head and bonnet, crankshaft and piston, camshaft and driving gear, the lubricating oil and cooling water systems, fuel line, starting motor, and generator.
Five variants are covered: 4TNV98-GGE, 4TNV98-NSA, 4TNV98-NSA2, 4TNV98T-GGE, and 4TNV98T-NSA, with separate gear housing and flywheel housing pages where the GGE and NSA builds differ. An Optional Kit chapter adds the engine foot, air cleaner, exhaust manifold, silencer and tail pipe, oil cooler, radiator, and electric parts.
It is a bookmarked 29-page PDF delivered as an instant download, so the diagram you need can be on the bench or at the parts counter in minutes.
What's Inside This Yanmar Yanmar 4TNV98-4TNV98T Series Parts Manual
| System | Pages |
|---|---|
| Cylinder Block | 2-3 |
| Gear Housing | 4-5 |
| Flywheel Housing & Oil Sump | 6-7 |
| Cylinder Head & Bonnet | 8-9 |
| Suction Manifold | 10 |
| Exhaust Manifold | 11 |
| Camshaft & Driving Gear | 12 |
| Crankshaft & Piston | 13 |
| Lub.Oil System | 14 |
| Cooling Water System | 15 |
| Fuel Injection Pump | 16 |
| Fuel Injection Valve | 17 |
| Fuel Line | 18 |
| Starting Motor | 19 |
| Generator | 20 |
| Gasket Set | 21 |
| Engine Foot (Optional Kit) | 23 |
| Air Cleaner (Optional Kit) | 24 |
| Exhaust Manifold (Optional Kit) | 25 |
| Silencer & Tail Pipe (Optional Kit) | 26 |
| Oil Cooler (Optional Kit) | 27 |
| Radiator (Optional Kit) | 28 |
| Electric Parts (Optional Kit) | 29 |
Yanmar Yanmar 4TNV98-4TNV98T Series Common Problems This Manual Covers
Hard starting after the engine sits
A 4TNV98 that cranks forever after weeks of standing has usually pulled air into the fuel system through a hardened seal or loose union. The Fuel Line diagram identifies every pipe, joint, and clamp in the circuit so you can replace the suspect pieces instead of guessing.
Manual Section: Fuel Line p. 18White smoke and rough running
Worn or dribbling injectors show up as white smoke, misfire, and a lumpy idle. The Fuel Injection Valve page breaks the injector assembly into its numbered parts so you can order everything for all four cylinders in one pass.
Manual Section: Fuel Injection Valve p. 17Low power or surging under load
When the engine will not hold speed under load and the filters are clean, suspicion falls on the injection pump. The Fuel Injection Pump page gives you the part numbers you need whether you are replacing the pump or sending it out for rebuild.
Manual Section: Fuel Injection Pump p. 16Overheating and coolant loss
Overheating and slow coolant loss on these engines usually trace to thermostat, water pump, or hose trouble. The Cooling Water System page maps the whole circuit so you can identify each component before you drain anything.
Manual Section: Cooling Water System p. 15Low oil pressure or bearing noise
Low oil pressure or a knock from below means the lubrication circuit needs sorting before anything gets reassembled. The Lub.Oil System page lays out the oil circuit components so you can put names and numbers to whatever the teardown condemns.
Manual Section: Lub.Oil System p. 14Slow cranking or a dead starter
A starter that clicks or drags on a cold morning is one of the most common failures on any diesel. The Starting Motor page identifies the starter and its fittings so you order the right unit the first time.
Manual Section: Starting Motor p. 19Leaks after a teardown
Every head pull or sump drop ends with a pile of gaskets that should not go back in. The Gasket Set page lets you order fresh seals as a single line item so the engine goes back together sealed, not scavenged.
Manual Section: Gasket Set p. 21Frequently Asked Questions
Which Yanmar engine models does this parts catalog cover?
It covers the 4TNV98-GGE, 4TNV98-NSA, 4TNV98-NSA2, 4TNV98T-GGE, and 4TNV98T-NSA. Where the builds differ, the catalog gives separate listings, such as distinct Gear Housing and Flywheel Housing and Oil Sump pages for the NSA/NSA2 and GGE versions.
Is this a service manual with torque specs and clearances?
No. This is the parts catalog: exploded diagrams and part numbers for each system, from Cylinder Block through Gasket Set. For the cylinder head torque sequence, valve lash, and bearing clearances you need the service manual; use this book alongside it to order what the measurements condemn.
How do I find the parts that fit my specific variant?
Sections that differ between builds are split by model. The Gear Housing for the NSA and NSA2 engines is on its own page with the GGE version on the next, and the Flywheel Housing and Oil Sump pages are split the same way. Match your model code to the correct diagram before ordering. p. 4
Does it cover the cooling system and radiator?
Yes. The Cooling Water System section diagrams the cooling circuit parts on the base engine, and the Optional Kit chapter adds separate listings for the Radiator and Oil Cooler. p. 15
Will this Yanmar 4TNV98-GGE Parts Catalog download right away?
A 29-page Parts Catalog in searchable PDF format (1 MB), available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print specific sections of this Yanmar 4TNV98-GGE Parts Catalog?
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.
Reviews
There are no reviews yet.