Part of the Yanmar Parts Manuals.
Hold a worn injection pump plunger from a 4TNE98 next to a new one and your eyes will not tell them apart; the part number will. This catalog is Yanmar publication Y00B5472 for the 4TNE98-BV engine, listed in its VIO70 application, so before you order anything you can confirm it matches the engine on your stand.
The 40 pages break the engine into thirteen bookmarked sections, from Cylinder Block and Crankshaft & Piston through the Lub. Oil System, Cooling Water System, Fuel Injection Pump, Governor, and Fuel Injection Valve, each one itemizing the assemblies, gaskets, seals, and hardware that go back together in that group.
Guessing at a bearing shell or a nozzle shim costs real money: the wrong part on the bench, another week of downtime, sometimes a second teardown. Buy the PDF once and it stays yours for the life of this engine.
What's Inside This Yanmar 4TNE98-BV (ViO70) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 3-4 | Block Assy, Cylinder, Plug, Bolt, Bush, Bearing Assy, Gasket |
| Gear Housing | 5-6 | Cover, Seal, Pump Assy, Lub. Oil, O-Ring, Bolt, Nut |
| Flywheel Housing & Lub. Oil Sump | 7-8 | Housing, Flywheel, Sump Assy, Oil, Drain Plug, Seal, Bolt, Parallel Pin |
| Cylinder Head & Bonnet | 9-10 | Head Assy, Cylinder, Valve, Spring, Seal, Support Asy, ROCK.ARM, Gasket |
| Suc. Manifold | 11-12 | Manifold, Int, Gasket, Air Heater, Bolt |
| Exh. Manifold & Silencer | 13-14 | Manifold, Exhaust, Gasket, Bolt, Stud, Nut, Silencer |
| Camshaft & Driving Gear | 15-16 | Camshaft Assy, Gear, Tappet, Rod, Push, Shaft, Idler, Bush |
| Crankshaft & Piston | 17-18 | Crankshaft Comp, Piston W/RING, Rod Assy, Connecting, Flywheel Assy, Gear, Bearing, Pin |
| Lub. Oil System | 19-20 | Dipstick, Filter, Pipe Assy, Oil Pressure Switch, O-Ring, Seal Washer |
| Cooling Water System | 21-23 | Water Pump, Pulley, V-Belt, Fan, Thermostat, Gasket |
| Fuel Injection Pump | 24-26 | Plunger, Delivery Valve, Tappet, Control Rack, Lever, Shim |
| Governor | 27-28 | Lever, Spring, Control Rack, Flyweight Assy, Shim, Camshaft |
| Fuel Injection Valve | 29-40 | Fuel Valve, Nozzle, Nozzle Holder, Nozzle Spring, Shim Pack, Injection Pipe |
Yanmar 4TNE98-BV (ViO70) Common Problems This Manual Covers
Hard starting and white smoke
Fouled or worn injectors are the usual reason a 4TNE98 cranks long and smokes white before it catches. When a nozzle fails the pop test, the Fuel Injection Valve section itemizes the nozzle, nozzle holder, nozzle spring, shim pack, and injection pipes so you replace exactly what is worn.
Manual Section: Fuel Injection Valve p. 29Overheating under load
A tired water pump, stuck thermostat, or glazed V-belt will push this engine hot within a half hour of real work. The Cooling Water System section lists the pump, pulley, belt, fan, thermostat, and gaskets so the whole circuit can be renewed in one order.
Manual Section: Cooling Water System p. 21Low oil pressure
Oil starvation kills main and rod bearings fast, and it often starts with a clogged filter or a failing pressure switch giving false readings. The Lub. Oil System section covers the filter, dipstick, oil pressure switch, pipe assemblies, and sealing washers.
Manual Section: Lub. Oil System p. 19Injection pump wear from dirty fuel
Contaminated fuel scores plungers and delivery valves, which shows up as rough running and lost power. The Fuel Injection Pump section breaks out the plunger, delivery valve, tappet, control rack, lever, and shims for a proper pump rebuild instead of a whole-pump gamble.
Manual Section: Fuel Injection Pump p. 24Hunting or surging idle
An engine that will not hold steady rpm usually has a fatigued governor spring or worn flyweight assembly. The Governor section identifies the levers, springs, control rack, flyweight assembly, and shims by part so you are not guessing at which piece lost its tension.
Manual Section: Governor p. 27Bottom-end rebuild after bearing damage
Once a bearing runs, the crank, rods, and pistons all need inspection before anything goes back in the block. The Crankshaft & Piston section lists the crankshaft, connecting rod assemblies, pistons with rings, bearings, pins, and flywheel so a full bottom-end order comes off one page.
Manual Section: Crankshaft & Piston p. 17Compression loss through the head
Low compression on one cylinder points to valves, seals, or a failed head gasket. The Cylinder Head & Bonnet section itemizes the head assembly, valves, springs, seals, rocker arm support, and gaskets needed for a head job.
Manual Section: Cylinder Head & Bonnet p. 9Frequently Asked Questions
Which engine does this parts catalog cover?
It covers the Yanmar 4TNE98-BV diesel engine in its VIO70 application, under Yanmar publication number Y00B5472. Check the model designation on your engine's nameplate against 4TNE98-BV before ordering parts from it.
Is this a service manual with torque specs and clearances?
No, this is a parts catalog. It identifies parts by assembly, from the Cylinder Block through the Fuel Injection Valve, so you can order correctly. For rebuild specifications like head torque sequence or bearing clearance you would pair it with the 4TNE98 service manual.
Does it cover injector and nozzle parts?
Yes. The Fuel Injection Valve section runs from page 29 through the end of the catalog and lists the fuel valve, nozzle, nozzle holder, nozzle spring, shim pack, and injection pipes. p. 29
Can I find cooling system parts in it?
Yes, the Cooling Water System section lists the water pump, pulley, V-belt, fan, thermostat, and gaskets, which covers the parts most often replaced when one of these engines starts running hot. p. 21
What format is this manual in?
Immediate download of the complete 40-page searchable Parts Catalog. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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