Part of the Yanmar Parts Manuals.
Somewhere between pulling the head and phoning in the parts order, every 4TNV98CT-WTB rebuild stalls on the same question: which O-ring, which camshaft bush, which cap bolt does Yanmar actually call for. This parts catalog (Yanmar publication YOOF2161, spec P-TB290EBA) answers it with exploded views and factory part numbers across 50 pages, from the cylinder block through the gasket set.
Every major group gets its own figure: crankshaft and piston, camshaft and driving gear, the turbocharger, the fuel supply pump and injection valves, the DPF and EGR hardware, starter, alternator, and ECU. When you are alone at the bench with the engine in pieces and nobody to ask, matching a worn part to its exact number is the difference between one order and three.
It downloads as a PDF, prints figure by figure, and once bought it is yours to keep for as long as you run this engine.
What's Inside This Yanmar 4TNV98CT-WTB, P-TB290EBA Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 6-7 | Block Assy Cylinder, Plug, Bolt Metal Cap, Bush Camshaft, Bearing Thrust, Gasket Cyl Head |
| Gear Housing | 8-9 | Case Gear, O-Ring, Pump Assy Oil, Cover Filler, Pipe, Seal Oil |
| Flywheel Housing & Oil Sump | 10-11 | Housing Flywheel, Seal, Sump Assy Oil, Plug Drain, Sensor Flywheel Rev |
| Cylinder Head & Bonnet | 12-13 | Head Assy Cylinder, Valve, Rocker Arm, Bonnet Assy, Breather, Plug Glow |
| Suction Manifold | 14-15 | Manifold Assy Intake, Sensor Air Temp, Duct Intake, Collector Assy, EGR Valve, Throttle Body |
| Exhaust Manifold | 16-17 | Manifold Exhaust, Sensor Exh Temp, Pipe Exh Pressure, EGR Cooler, EGR Valve, Clamp Assy |
| Diesel Particulate Filter (DPF) | 18-19 | DPF Assy, Sensor Exh Temp, Case DOC, Silencer DPF, Stiffener DPF, Sensor Unit Pressure |
| Camshaft & Driving Gear | 20-21 | Tappet, Shaft Assy Cam, Gear Camshaft, Pulser Cam Gear, Gear Assy Idle, Gear Supply Pump |
| Turbine | 22-23 | Turbocharger, Gasket, Stud, Nut |
| Crankshaft & Piston | 24-25 | Crankshaft Assy, Gear, Pin, V-Pulley, Flywheel Assy, Piston Assy, Ring Assy, Rod Assy |
| Lub.Oil System | 26-27 | Cooler Assy, O-Ring, Bracket, Pipe, Dipstick, Filter |
| Lub.Oil Line | 28-29 | Switch, Pipe Assy, Retainer, Valve Assy, Nozzle, Pin |
| Cooling Water System | 30-31 | Pump Assy, V-Pulley, V- |
| Fuel Supply Pump | 32-33 | - |
| Fuel Injection Valve | 34-35 | - |
| Fuel Line | 36-37 | - |
| Starting Motor | 38-39 | Starter, Armature Assy, Coil Assy, Switch Assy, Pinion Assy, Clutch Assy |
| Generator | 40-41 | Alternator, Adjuster, Spacer, Relay |
| Electronic Control Unit (ECU) | 42-43 | - |
| Electric Parts | 44-45 | Bracket, Harness, Connector, Boot, Band |
| Gasket Set | 46-50 | Packing, Gasket, Seal, O-Ring, Driver, Wrench |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 4TNV98CT-WTB (Common-Rail Diesel, DPF+ECU) | ||
| Takeuchi P-TB290EBA / TB290 | ||
| Parts Catalog | ||
| YOOF2161 | ||
| 50 | ||
| Fuel Injection Valve (p.34), Lub Oil Cooler/Filter (p.26), DPF Assembly (p.18) |
Yanmar 4TNV98CT-WTB, P-TB290EBA Common Problems This Manual Covers
Cranks but will not start
On TNV common-rail engines, a no-start usually traces to fuel supply restriction, air in the system, or a supply pump fault. The Fuel Supply Pump figure identifies every pump component by part number, so you can replace the failed piece instead of guessing at an assembly.
Manual Section: Fuel Supply Pump p. 32DPF plugging and reduced power mode
A soot-loaded filter or a failed exhaust pressure sensor will put this engine into derate. The DPF figure breaks the assembly into its DOC case, silencer, stiffeners, temperature sensors, and pressure sensor unit so you can order only what actually failed.
Manual Section: Diesel Particulate Filter (DPF) p. 18Oil leaks at seals and gaskets
Once an engine this age starts seeping at the housings, you want every gasket, seal, packing, and O-ring in one order. The Gasket Set section lists them together, along with the driver and wrench items Yanmar catalogs with the set.
Manual Section: Gasket Set p. 46Turbocharger wear on high-hour engines
Oil smoke and falling boost eventually mean turbo work. The Turbine figure covers the turbocharger with its gasket, studs, and nuts, so the mounting hardware goes in the same order as the unit.
Manual Section: Turbine p. 22Starter drags or fails to engage
Slow cranking kills hot starts long before the motor dies outright. The Starting Motor figure lists the armature, coil, switch, pinion, and clutch assemblies separately, which makes a bench repair of the starter a realistic option instead of a full replacement.
Manual Section: Starting Motor p. 38Coolant pump seepage and overheating
A weeping water pump or glazed belt shows up as slow overheating under load. The Cooling Water System figure gives the pump assembly and V-pulley part numbers so the cooling side goes back together with the right pieces.
Manual Section: Cooling Water System p. 30Worn bearings and rings at teardown
With the crank out and plastigauge on the journals, the next step is ordering rotating parts by exact number. The Crankshaft & Piston figure covers the crankshaft assembly, piston and ring assemblies, rod assemblies, flywheel, and V-pulley in one place.
Manual Section: Crankshaft & Piston p. 24Frequently Asked Questions
Which engine does this parts catalog cover?
It covers the Yanmar 4TNV98CT-WTB industrial diesel engine, specification P-TB290EBA, and is Yanmar publication YOOF2161. Check the spec code on your engine nameplate against P-TB290EBA before ordering parts from it.
Is this a service manual with torque specs and clearances?
No. This is the factory parts catalog: 21 exploded-view figures with Yanmar part numbers for identifying and ordering components. It does not contain torque sequences, bearing clearances, or repair procedures; pair it with the service manual for those.
Can I get complete gasket and seal part numbers for a rebuild?
Yes. The Gasket Set section lists the packing, gaskets, seals, and O-rings cataloged for this engine, so you can price a full reseal in one order instead of chasing individual numbers figure by figure. p. 46
Does it cover the DPF, EGR, and emissions parts?
Yes. The Diesel Particulate Filter (DPF) section breaks out the DOC case, silencer, temperature sensors, and pressure sensor unit, and the Suction Manifold and Exhaust Manifold sections cover the EGR valve, EGR cooler, and throttle body. p. 18
What do I get after purchasing this Yanmar 4TNV98CT-WTB manual?
This is a 50-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Am I able to print pages from 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.
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