Need the factory part numbers for your Yanmar 4TNV98T-ZXWTB2? This 48-page parts catalog covers every sub-assembly in the turbocharged 4-cylinder, from the cylinder block, gear housing, and flywheel through the crankshaft and piston assemblies, fuel injection pump and governor, all the way to the ECU and complete gasket sets. Inside, each system gets a dedicated exploded-view figure with numbered callouts tied to Yanmar OEM part numbers, so you can identify exactly which component you need and order with confidence. Match your O-ring to the 1A P-7.0 spec and confirm your thrust bearing at 0.25 mm before you call your parts distributor. Guessing at part numbers costs you time and a restocking fee. Bookmarked by assembly and keyword-searchable, so you land on the right figure in under a minute.
What's Inside This Yanmar 4TNV98T-ZXWTB2 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 6-7 | Assy, Plug, Bolt, Bush, Spring Pin, Bearing |
| Gear Housing | 8-9 | Case, Gear, Pump Assy, O-Ring, Bolt, Cover |
| Flywheel Housing & Oil Sump | 10-11 | Housing, Plug, Bolt, Seal, Oil Pan Assy, Washer |
| Cylinder Head & Bonnet (4TNV98T-ZXWTB2) | 12-13 | Head Assy, Cylinder, Valve, Spring, Retainer, Bonnet Assy |
| Suction Manifold | 14-15 | Manifold Assy, Manifold, Valve |
| Exhaust Manifold & Silencer | 16-17 | - |
| Camshaft & Driving Gear | 18-19 | - |
| Turbine | 20-21 | - |
| Crankshaft & Piston | 22-23 | Crankshaft Assy, Gear, Piston Assy, Ring Set, Rod Assy, Bearing |
| Lub.Oil System | 24-25 | Cooler Assy, O-Ring, Bracket, Dipstick, Guide, Filter |
| Lub.Oil Line | 26-27 | Switch, Pipe Assy, Retainer, Joint Bolt, Valve Assy, Nozzle |
| Cooling Water System | 28-29 | Pump Assy, V-Belt, Fan, Thermostat, Tank Assy, Cock Assy |
| Fuel Injection Pump | 30-31 | Injecton Pump Assy, Valve Assy, Timer Set, Piston, Harness Assy, Bracket |
| Governor | 32-33 | Plug, Gasket, Sensor, Gear, Seal Washer |
| Fuel Injection Valve | 34-35 | Valve Assy, Nozzle Assy, Spring, Shim Set, Retainer, Pipe Assy |
| Fuel Line | 36-37 | Bracket, Filter, Pipe Assy, Tube, Pump Assy, Element Kit |
| Starting Motor | 38-39 | Armature Assy, Coil Assy, Brush, Gear Case, Pinion Assy, Clutch Assy |
| Generator | 40-41 | Rotor Assy, Ball Bearing, Bracket, Pully, Relay |
| Electronic Control Unit (ECU) | 42-43 | ECU Cmp, Shield, Collar, Absorber |
| Gasket Set | 44-48 | Gasket, O-Ring, Washer, Seal, Protector, Seat |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Spring Pin Size | 6x12 | p. 7 |
| Plug Thread Size | PT3/8 | p. 7 |
| Thrust Bearing Size | 0.25 | p. 7 |
| O-Ring Size | 1A P-7.0 | p. 9 |
| Nut Size | M10 | p. 9 |
| Cotter Size | 7 | p. 13 |
| Stud Bolt Size | M8x22 | p. 13 |
| Clamp Size | 54 | p. 15 |
| Key Size | 7x14 | p. 19 |
| Circlip Size | 30 | p. 23 |
| Starter Motor Rating | 12V, 3KW | p. 39 |
| Wrench Size | 10x12 | p. 45 |
Yanmar 4TNV98T-ZXWTB2 Common Problems This Manual Covers
Yanmar 4TNV98T-ZXWTB2 glow plug part number unknown, engine won't cold-start p. 12
Check the Cylinder Head & Bonnet exploded view starting on page 12. Locate the glow plug position in the head assembly diagram and match the part number from the list. Cross-reference the valve and head component listings to confirm fitment for your serial number range before ordering.
Manual Section: Cylinder Head & Bonnet (4TNV98T-ZXWTB2)Fuel filter and separator element part numbers needed for fuel contamination clean-out p. 36
Open the Fuel Line section on page 36. The exploded view lists the filter bracket assembly, element kit, and pipe assemblies with individual part numbers. Identify the Element Kit line item specifically — this is the replaceable filter media. Cross-check the Fuel Injection Pump diagram on page 30 for any inline strainer components listed there.
Manual Section: Fuel LineWater pump impeller or seal kit part number needed after coolant leak found p. 28
Go to the Cooling Water System diagram on page 28. Find the Pump Assy line item and note its part number, then scan for sub-components listed beneath it: impeller, seal, and housing O-rings are typically broken out as separate line items. The thermostat and Cock Assy are also cataloged on the same spread if those need replacement alongside.
Manual Section: Cooling Water SystemOil seal part numbers needed for lubrication system leak, unsure which seals fit p. 24
Check the Lub.Oil System parts list on page 24 for the cooler assembly O-rings and filter components. For crankshaft and sump seals, cross-reference the Flywheel Housing & Oil Sump diagram on page 10 — seal and plug part numbers are listed there. The Gasket Set index on page 46 consolidates all seals and O-rings in one place for a complete leak-repair order.
Manual Section: Lub.Oil SystemStarting motor brushes or pinion assembly part numbers needed, starter spins but won't engage p. 38
Find the Starting Motor exploded view on page 38. The catalog breaks out Armature Assy, Brush set, Pinion Assy, Clutch Assy, and Gear Case as separate line items — locate the specific failed component and note its part number. The starter is rated 12V, 3KW (page 39); confirm any replacement part matches that spec before ordering.
Manual Section: Starting MotorFull engine rebuild gasket set part numbers needed, unsure what's included in kit p. 46
Start with the Gasket Set index on page 46, which lists every gasket, O-ring, seal, and washer available for this engine. Cross-reference the exploded view on page 44 to visually confirm which pieces belong to the top-end versus bottom-end. Order the complete kit part number if available, or pull individual part numbers for head gasket, valve seals, and sump gasket separately from that index.
Manual Section: Gasket SetFrequently Asked Questions
What are the replacement specifications for fuel filter?
The replacement fuel filter is specified by part number Y129907-55801, with a required quantity of 1. An entire fuel filter assembly is also available under part number Y129917-55801, with a quantity of 1. For maintenance, an element kit, part number Y129917-55850, is provided.
How do you fix yanmar 4TNV98T-ZXWTB2 glow plug part number unknown, engine won't cold-start?
Check the Cylinder Head & Bonnet exploded view starting on page 12. Locate the glow plug position in the head assembly diagram and match the part number from the list. Cross-reference the valve and head component listings to confirm fitment for your serial number range before ordering.
How do you fix fuel filter and separator element part numbers needed for fuel contamination clean-out?
Open the Fuel Line section on page 36. The exploded view lists the filter bracket assembly, element kit, and pipe assemblies with individual part numbers. Identify the Element Kit line item specifically — this is the replaceable filter media. Cross-check the Fuel Injection Pump diagram on page 30 for any inline strainer components listed there.
How do you fix water pump impeller or seal kit part number needed after coolant leak found?
Go to the Cooling Water System diagram on page 28. Find the Pump Assy line item and note its part number, then scan for sub-components listed beneath it: impeller, seal, and housing O-rings are typically broken out as separate line items. The thermostat and Cock Assy are also cataloged on the same spread if those need replacement alongside.
Is this Yanmar 4TNV98T-ZXWTB2 Parts Catalog a digital download?
A 48-page Parts Catalog in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print 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.
Document Quality
This document is a scanned PDF with an applied OCR layer, allowing you to search and copy the full text. The main text is crisp and easy to read throughout. Diagrams and illustrations are raster images, and while their labels are generally readable, they may show some pixelation upon zooming. Pages are mostly clean, though some minor scan artifacts are present, and the main diagram on page 1 is slightly skewed. Page 5 is a blank 'Memo' page.
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