Part of the Yanmar Parts Manuals.
Mic the crank journals on a Yanmar 4TNV98CT-WTBZ and the next call is standard shells or 0.25 undersize, and this parts catalog (Yanmar publication YOOF2161) confirms the undersize main and crank pin bearings exist before the machine shop cuts anything. It covers the 4TNV98CT-WTBZ common rail turbocharged diesel, serial prefix 00185-, and lists the 4JH-DT, 4JH-DTZ, 4JH-DTZP, 4JH-DTZA and 4JH-DTZY model codes.
Twenty-one numbered figures run from the Cylinder Block through the Gasket Set: cylinder head, camshaft and gears, the RHF5 turbocharger, fuel supply pump, common rail injectors, DPF, starter, alternator, ECU and harnesses. With the engine stripped on the stand, you match the figure to the part in your hand and order the exact Yanmar number instead of guessing.
It is a 50 page bookmarked PDF in English, bought once and yours to keep, printable page by page for the bench. Every hour the engine sits apart waiting on a wrong shell costs more than this catalog does.
What's Inside This Yanmar 4TNV98CT-WTBZ (TB280) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 6-7 | Camshaft Bush, Thrust Bearing, Main Spare Parts Bearing, Under-Sized Part Bearing, Thrust Over-Sized Part Bearing |
| Gear Housing | 8-9 | Oil Pump Assy, Filler Cover, Pipe, Oil Seal, Cover |
| Flywheel Housing & Oil Sump | 10-11 | Cap, D115/95XT11 Seal, Oil Sump Assy, Pin |
| Cylinder Head & Bonnet | 12-13 | Valve Cap, Intake Valve, Exhaust Valve, Valve Spring, Spring Retainer, Valve Stem Seal, Injector Gasket, Arm Support Assy |
| Suction Manifold | 14-15 | Stud, Bolt, Clamp, Washer |
| Exhaust Manifold | 16-17 | 12X1 Gasket, EGR Cooler Gasket, Gasket, Stud |
| Diesel Particulate Filter (DPF) | 18-19 | Silencer Gasket, Bolt, Nut |
| Camshaft & Driving Gear | 20-21 | Tappet, Push Rod, Thrust Bearing, Idle Gear Assy, Idle Gear Spare Parts Bush |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Bearing Undersize | 0.25 US | p. 7 |
| Thrust Bearing Oversize | 0.25 OS | p. 7 |
| Flywheel Housing Oil Seal Dimension | D115/95XT11 | p. 11 |
| Exhaust Manifold Bolt Grade | M10x95, Grade 10.9T | p. 17 |
| EGR Cooler Bolt Grade | M8x50, Grade 10.9 | p. 17 |
| DPF Bolt Grade | M8x28, Grade 10.9T | p. 19 |
| Crank Pin Bearing Undersize | 0.25 US | p. 25 |
| Piston Assembly Oversize | 0.25 OS | p. 25 |
| Piston Ring Assembly Oversize | 0.25 OS | p. 25 |
| Cooling Water V-Belt Size | B 44.5 | p. 31 |
Yanmar 4TNV98CT-WTBZ (TB280) Common Problems This Manual Covers
Hard starting and air in the fuel
When the engine cranks long or needs bleeding every morning, suspect air entering through tired fuel hoses or a clogged filter. The Fuel Line figure identifies the fuel oil filter assembly, brackets and hose assemblies so you replace the whole leak-prone run, not just the element.
Manual Section: Fuel Line p. 36Overheating and coolant loss
A failing water pump or stuck thermostat shows up as creeping temperature and steady coolant loss. The Cooling Water System figure lists the water pump assembly, thermostat, cooling fan, hose assemblies and the B 44.5 V-belt by part number.
Manual Section: Cooling Water System p. 30Worn crank journals at rebuild time
If the journals mic below spec, the catalog confirms that 0.25 US crank pin bearings and 0.25 OS piston and ring assemblies exist before you commit to a regrind or rebore. The connecting rod assemblies and flywheel are in the same figure.
Manual Section: Crankshaft & Piston p. 24Plugged DPF and exhaust temperature faults
A loaded DPF or a failed exhaust temperature sensor will choke a common rail diesel down until it barely pulls. The Diesel Particulate Filter (DPF) figure breaks out the DPF assembly, silencer, sensors, gaskets and case hardware.
Manual Section: Diesel Particulate Filter (DPF) p. 18Low oil pressure warning at idle
The oil pressure switch and its lines are the first suspects when the warning light flickers at hot idle. The Lub.Oil Line figure lists the switch, pipe assemblies, retainers and the turbocharger oil return line so you can chase the whole circuit.
Manual Section: Lub.Oil Line p. 28Slow cranking or a dead starter
Brushes and the switch assembly wear out long before the rest of the starter does. The Starting Motor figure lists the armature assembly, field coil assembly, brush set and switch assembly, so you can rebuild the unit instead of replacing it.
Manual Section: Starting Motor p. 38Rough running from tired injectors
Rough idle, smoke and rail pressure complaints usually end at the injectors or the rail pressure sensor. The Fuel Injection Valve figure lists the CR injectors, retaining rings and the rail assembly with its sensor.
Manual Section: Fuel Injection Valve p. 34Frequently Asked Questions
Which engine models does this parts catalog cover?
It is published for the Yanmar 4TNV98CT-WTBZ with serial prefix 00185-, under Yanmar publication number YOOF2161. The listing also references codes 4JH-DT, 4JH-DTZ, 4JH-DTZP, 4JH-DTZA, 4JH-DTZY, P-TB280FR_FEOA and 0CD11-M18700. Check your engine nameplate against these before buying.
Does it list undersize bearings and oversize pistons for a rebuild?
Yes. The Crankshaft & Piston figure lists 0.25 US crank pin bearings plus 0.25 OS piston and ring assemblies, and the Cylinder Block figure carries the 0.25 US main bearings and 0.25 OS thrust bearing, so you can confirm rebuild parts exist before machining. p. 24
Are the DPF and EGR parts included?
Yes. The Diesel Particulate Filter (DPF) figure covers the DPF assembly, silencer, exhaust temperature sensors, gaskets and case, and the Exhaust Manifold figure lists the EGR cooler and EGR valve alongside its own temperature sensor. p. 18
Is this a repair manual with torque specs and clearances?
No. It is a parts catalog, so there are no torque sequences or clearance tables. The listings do carry fastener sizes and grades, for example the M10x95 grade 10.9T exhaust manifold bolts, so hardware goes back in correctly. p. 16
What do I get after purchasing this 4TNV98CT-WTBZ manual?
Instant PDF download. You get the full 50-page searchable Parts Catalog immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I able to print pages from this 4TNV98CT-WTBZ 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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