Need the OEM part number for your Yanmar 4TNV98-ZNMS engine? This 66-page parts catalog (OEM #917304) covers variants for Mustang 2066, 2076, and Gehl 5640E. Inside: exploded views and part numbers for every assembly, from the cylinder block and gear housing through the fuel injection pump, governor, starting motor, and cooling water system. Turbocharged variants get dedicated sections for the turbine and lubrication oil line; the generator gets its own listing. The electrical section breaks out the ECU assembly, accel sensor, and relay components by OEM number so you identify and order the exact part on your first call. Wrong parts sitting on your bench cost hours. Bookmarked by system, searchable by keyword: grab it on your phone and pull the number before you touch the wrench.
What's Inside This Yanmar 4TNV98-ZNMS / ZNTBL (Mustang / Gehl) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Gear Housing | 3-4 | Case, Gear, Housing, Pump Assy, Lub.Oil, Cover, Filler, Seal |
| Flywheel Housing and Oil Sump | 5-6 | Cover Assy, Flywheel, Housing, Cap, Flywheel Cover, Seal, Oil, Sump Assy |
| Cylinder Head and Bonnet | 7-12 | Head Assy, Cylinder, Valve, Spring, Rocker Arm, Bonnet Assy, Baffle Plate, Breather |
| Suction Manifold | 13-16 | Manifold Cmp, Intake, Gasket, Heater, Air, Bend, Reedvalve, Duct |
| Exhaust Manifold and Silencer | 17-20 | Manifold, Exhaust, Silencer, Stay, EGR Valve, Gasket, EGR Pipe |
| Camshaft and Driving Gear | 21-22 | Camshft Assy, Gear, Camshaft, Gear Assy, Idle, Bush, Idle Gear |
| Crankshaft and Piston | 23-24 | Crankshaft Comp, Gear, Crankshaft, Piston Assy, Ring Set, Piston, Rod Assy, Connecting |
| Lubrication Oil System | 25-30 | Dipstick, Filter, Lub.Oil, Pipe Assy, Lub.Oil Inlet, Sender, Oil Pressure, Cooler Assy |
| Cooling Water System | 31-34 | Pump Assy, Water, Gasket, Cw-P, Pulley, Case Assy, Thermostat, V-Belt A44 |
| 35-36 | - |
Yanmar 4TNV98-ZNMS / ZNTBL (Mustang / Gehl) Common Problems This Manual Covers
Yanmar 4TNV98 fuel filter and fuel-water separator part numbers unclear when sourcing replacements across Mustang and Gehl machine applications p. 41
Find the Fuel Line exploded view on page 41. Identify the Fuel Filter assembly and Fuel Feed Pump Assy part numbers from the adjacent parts list. The fuel-water separator appears as a separate line item. For fuel line banjo bolt hardware, page 65 lists M10-1.5 Grade 12.9 torque at 86.7 N·m to help confirm the correct fastener part number.
Manual Section: Fuel LineWater pump and thermostat part numbers needed for cooling system parts order p. 31
Check the Cooling Water System exploded view on page 31. Locate the Water Pump Assy and Thermostat entries in the parts list. The V-Belt A44 is listed on the same pages; include it if replacing the pump. For pump bracket fastener selection, page 65 lists M8-1.25 Grade 12.9 torque at 44.0 N·m.
Manual Section: Cooling Water SystemComplete gasket set part number unknown when ordering top-end rebuild parts p. 47
Pull up the Tool and Gasket Set section on page 47. The Gasket Set and Cylinder Head Gasket are listed separately; order both for a full top-end refresh. O-rings, valve stem seals, and nozzle protectors appear as individual line items. If sourcing new head bolts too, page 65 lists M12-1.75 Grade 12.9 torque at 151.1 N·m to match fastener grade.
Manual Section: Tool and Gasket SetFuel injection pump assembly part numbers unclear between turbocharged and naturally aspirated variants p. 35
Open the Fuel Injection Pump section on page 35. The Injection Pump Assy is the top-level item; Delivery Valve Assy, Piston, Holder, and Seal Washer break out below it. Turbocharged (-T) variants may carry a different pump number than naturally aspirated models; confirm your engine suffix first. For mounting hardware, page 65 lists M10-1.5 Grade 12.9 torque at 86.7 N·m.
Manual Section: Fuel Injection PumpGovernor speed sensor part number needed after recurring starting fault on electronically controlled engine p. 37
Go to the Governor section on page 37. The speed sensor and Actuator appear as separate line items below the Case Assy and GOV.LEVER. Verify your engine is the electronically controlled variant before ordering; mechanical and electronic actuator assemblies carry different part numbers. For sensor bracket hardware, page 65 lists M8-1.25 Grade 12.9 torque at 44.0 N·m.
Manual Section: GovernorStarter motor brush set and pinion clutch part numbers hard to locate in the catalog p. 43
Find the Starting Motor section on page 43. The Starter breaks into Armature Assy, Brush set, Magnetic Switch Assy, Pinion Assy, and Clutch Assy as separate line items. Order the Brush set alone if the starter drags; add the Pinion Assy and Clutch Assy if it fails to engage. Mounting bolts: page 65 lists M10-1.5 Grade 12.9 at 86.7 N·m.
Manual Section: Starting MotorFrequently Asked Questions
What are the replacement specifications for Fuel filters?
The manual identifies the fuel oil filter as Part No. 193024 and its element as Part No. 186340 within the FUEL LINE section. However, it does not provide specific replacement specifications, intervals, or procedures for these components.
How do you fix yanmar 4TNV98 fuel filter and fuel-water separator part numbers unclear when sourcing replacements across Mustang and Gehl machine applications?
Find the Fuel Line exploded view on page 41. Identify the Fuel Filter assembly and Fuel Feed Pump Assy part numbers from the adjacent parts list. The fuel-water separator appears as a separate line item. For fuel line banjo bolt hardware, page 65 lists M10-1.5 Grade 12.9 torque at 86.7 N·m to help confirm the correct fastener part number.
How do you fix water pump and thermostat part numbers needed for cooling system parts order?
Check the Cooling Water System exploded view on page 31. Locate the Water Pump Assy and Thermostat entries in the parts list. The V-Belt A44 is listed on the same pages; include it if replacing the pump. For pump bracket fastener selection, page 65 lists M8-1.25 Grade 12.9 torque at 44.0 N·m.
What do I get after purchasing this Yanmar 4TNV98-ZNMS & variants manual?
This is a 66-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.
Can I print this manual?
Yes — the PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Document Quality
This document is a scanned PDF with an accurate OCR layer, allowing you to search and copy the full text. The text throughout is crisp and highly readable. Diagrams and illustrations are clear raster images, with all labels easily legible. Pages are clean, free from major scan artifacts or marks, and consistently well-aligned. Note that page 60 is a blank filler page titled 'SECTION NOTES'.
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