Part of the Yanmar Parts Manuals.
An engine on the stand with the crank out is a bad place to discover you ordered the wrong bearing shells. Yanmar publication Y00B5780 exists to prevent that: the factory parts catalog for the 3TNE68-NBAB industrial diesel in its B15AY specification, part of the TNE series, it puts the correct part number for every component in front of you before you spend money.
The 32 pages are organized by system, from Cylinder Block, Cylinder Head and Bonnet, and Crankshaft and Piston through the Fuel Injection Device, Governor, Cooling Water System, Starting Motor, and Generator, ending with the optional Gasket Set and tools. Each system pairs an exploded view with its numbered parts list, including undersize thrust bearings and 0.25 oversize piston assemblies for rebuilds.
The PDF is bookmarked by section, so when the head is off and you need a valve stem seal number, you are one click from the Cylinder Head pages.
What's Inside This Yanmar 3TNE68-NBAB, 3TNE68-NBAB (B15AY), TNE Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 3-4 | Cylinder, Plug, Main Bearing, Thrust Bearing, Bush, Cylinder Head Gasket |
| Gear Housing | 5-6 | Gear Case, Oil Seal, Lub. Oil Pump, Gear Assy, Ball Bearing, O-Ring |
| Flywheel Housing & Lub. Oil Sump | 7-8 | Flywheel Housing, Flywheel Cover, Oil Seal, Oil Sump, Drain Plug, Seal Washer |
| Cylinder Head & Bonnet | 9-10 | Cylinder Head, Bonnet, Valve, Valve Spring, Valve Stem Seal, Rocker Arm, Glow Plug |
| Suction & Exhaust Manifold | 11-12 | Suction Manifold, Exhaust Manifold, Manifold Gasket, Bolt, Stud, Nut |
| Camshaft & Driving Gear | 13-14 | Camshaft, Camshaft Gear, Thrust Bearing, Tappet, Push Rod, Idle Gear, Ball Bearing |
| Crankshaft & Piston | 15-16 | Crankshaft, Crankshaft Gear, Fly |
| Lub. Oil System | 17-18 | - |
| Cooling Water System | 19-20 | Pump Assy, C. Water, Switch, Thermo, V-Pulley, Thermostat, Fan |
| Fuel Injection Device | 21-22 | Pump Assy, F.INJECT., Plunger W/BARREL, Nozzle Assy, F.INJECT, Pipe, Fuel Inject, Fuel INJECT.VALVE As |
| Fuel Pipe | 23-24 | Pipe W/JOINT, Fuel, Joint, Pipe, Clamp, Pipe Assy, Fuel Oil, Strainer |
| Governor | 25-26 | Cover, Case, Weight Assy, Gov., Lever Assy |
| Starting Motor | 27-28 | - |
| Generator | 29-30 | - |
| Gasket Set (Optional) & Tool | 31-32 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Lubricating Oil Filter Quantity | 1 filter | p. 16 |
| Thrust Bearing Undersize | 0.25 US | p. 14 |
| Oil Seal Dimension | HTC456208 | p. 4 |
| O-Ring 1A P-type Dimension | 12.0 | p. 4 |
| Drain Plug Thread | M22 | p. 6 |
| Piston Assembly Oversize | 0.25 | p. 14 |
| Fan Diameter | 290 | p. 18 |
| Link Length (White) | 88.8 | p. 24 |
| Link Length (Red) | 89.0 | p. 24 |
Yanmar 3TNE68-NBAB, 3TNE68-NBAB (B15AY), TNE Common Problems This Manual Covers
Hard starting in cold weather
A 3TNE68 that cranks but will not light off cold usually needs its glow plugs checked before anything else. The Cylinder Head and Bonnet section lists the glow plugs alongside the valves, springs, and stem seals, so you can order the heat side and the breathing side in one pass.
Manual Section: Cylinder Head & Bonnet p. 9White smoke and rough running
Contaminated fuel wears plungers and fouls nozzles, and the result is white smoke, uneven idle, and weak power. The Fuel Injection Device section breaks down the injection pump assembly, plunger with barrel, and nozzle assemblies so you replace the worn internals instead of guessing at a whole pump.
Manual Section: Fuel Injection Device p. 21Fuel starvation and air in lines
A cracked joint or clogged strainer lets air into the low pressure side, and the engine stumbles or dies no matter how many times you bleed it. The Fuel Pipe section identifies every pipe, joint, clamp, and the fuel strainer, which is where these leaks actually hide.
Manual Section: Fuel Pipe p. 23Overheating under sustained load
These engines shut themselves down when cooling flow drops, and the usual suspects are the water pump, thermostat, and thermo switch. The Cooling Water System section lists the pump assembly, thermostat, V-pulley, and fan so a cooling refresh arrives as one complete order.
Manual Section: Cooling Water System p. 19Low compression at high hours
Worn rings and tired bores show up as slow starting and blow-by long before outright failure. The Crankshaft and Piston section is where you spec the rebuild, including the 0.25 oversize piston assemblies the catalog lists for a rebored block.
Manual Section: Crankshaft & Piston p. 15Oil leaks at the rear seal
Oil weeping between the engine and whatever it drives usually traces to the rear crankshaft oil seal or sump joint. The Flywheel Housing and Lub. Oil Sump section identifies the oil seal, sump, drain plug, and seal washer so you fix the leak with the flywheel off only once.
Manual Section: Flywheel Housing & Lub. Oil Sump p. 7Surging or hunting at steady speed
An engine that hunts under a constant load often has wear in the governor linkage rather than a fuel problem. The Governor section breaks down the weight assembly, lever assembly, cover, and case so you can identify the loose piece before pulling the gear case apart a second time.
Manual Section: Governor p. 25Frequently Asked Questions
Which engine does this parts catalog cover?
It covers the Yanmar 3TNE68-NBAB industrial diesel in the B15AY specification, part of the TNE engine series. It is Yanmar publication Y00B5780, in English. Check the model and specification code on your engine's nameplate against these before buying.
Is this a service manual with torque specs and clearances?
No. This is a parts catalog: exploded diagrams and part number listings for identifying and ordering components, from main bearings to glow plugs. It does not contain repair procedures, torque sequences, or clearance tables, so pair it with a service manual if you are doing the actual teardown.
Does it list oversize and undersize parts for a rebuild?
Yes. The Crankshaft and Piston section lists 0.25 oversize piston assemblies for rebored blocks, and the catalog also lists a 0.25 undersize thrust bearing. That lets you order rebuild-dimension parts by number instead of measuring and guessing. p. 15
Does it cover the fuel injection pump and injectors?
Yes. The Fuel Injection Device section lists the injection pump assembly, plunger with barrel, nozzle assemblies, and injection pipes, and the Fuel Pipe section that follows covers the supply pipes, joints, clamps, and fuel strainer. p. 21
What format is this manual in?
You get a 32-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Does this Yanmar 3TNE68-NBAB manual allow printing?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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