Part of the Yanmar Parts Manuals.
Strip the injection pump on a 3TNE68 and you are holding a plunger and barrel that only match one exact part number, not the near miss a cross-reference chart will sell you. Guess wrong and you pay twice: once for the part, again for the second teardown. This Yanmar parts catalog (publication 0CR10-G45101) breaks that pump, the governor, the injectors, and the fuel filter into exploded views keyed to OEM part numbers.
Coverage runs through the whole engine: cylinder block, cylinder head, crankshaft and pistons, camshaft and gears, lubricating oil and cooling water systems, radiator, generator, panel, starting motor, and the full gasket set. It applies to the 3TNE68-SA, 3TNE68-G1A, 3TNE68-G2A, 3TNE68C-SA, 3TNE68C-G1A, and 3TNE68-62A.
At 28 pages it is a small, bookmarked PDF that lives on whatever phone or laptop is nearest the engine, on a stand or in service, so the numbers are there before the parts order goes in.
What's Inside This Yanmar Yanmar 3TNE68 Series Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 1 | OEM Part Numbers |
| Gear Housing | 2 | OEM Part Numbers |
| Flywheel Housing & Oil Sump | 3 | OEM Part Numbers |
| Cylinder Head & Bonnet | 4-5 | OEM Part Numbers |
| Suction Manifold & Air Cleaner | 6 | Suction, Cleaner Assy, Air, Manifold |
| Exhaust Manifold & Silencer | 7 | Figure 6. Exhaust Manifold & Silencer, Manifold, Exhaust, Silencer |
| Camshaft & Driving Gear | 8 | Camshaft Assy, Camshaft, Gear W/Bush, Idle, Gear |
| Crankshaft & Piston | 9 | Crankshaft Assy, Piston W/Rings |
| Lub.Oil System | 10 | Lub. Oil Filter, Oil Press, Oil Intake, Dipstick |
| Cooling Water System | 11 | C.W. Pump, V-Belt, V-Pulley, Cooling, Thermostat |
| Radiator | 12-13 | Shroud, Hose, C.WATER, Absorber, Shock, Sub-Tank Assy, Water Drain, Fan |
| Fuel Injection Pump | 14 | F.I.Pump Assy, Plunger W/Barrel, Valve W/Seat, Deliv., Rack, Tappet Assy |
| Governor | 15-16 | Case, Driving Set, Gov., Weight Assy, Sleeve, Case Assy |
| Fuel Injection Valve | 17 | Nozzle Assy, Fuel Inject, Fuel Over, Valve Assy, Pipe Assy |
| Fuel Filter | 18-19 | Fuel Feed, Strainer Assy, Fuel Element, Pump Assy, Pipe |
| Engine Control Device | 20 | Link, Engine Control, Control Device, Handle, Regulator Assy, Bracket, Stopper |
| Generator | 23 | Rotor Assy, Stator Assy, Brush Assy, Diode Assy, Pulley, Regulator |
| Panel | 24-25 | Terminal, Harness, Wire, Support, Instrum, Lamp |
| Gasket Set | 26 | Cyl. Head, O-Ring, Seal, Valve Stem, Nozzle, Liquid, Gasket |
| Starting Motor (Cold District) | 27-28 | Motor Assy, Starting, Armature, Ball Bearing, Coil Assy, Field, Brush |
Every system also includes a parts list.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Thermostat opening temperature | 71 C | p. 11 |
| Valve Guide Quantity | 6 | p. 4 |
| Valve Spring Quantity | 6 | p. 4 |
| Radiator Clamp (38mm) Quantity | 4 | p. 12 |
| Starting Motor Brush (+) Quantity | 2 | p. 21 |
Yanmar Yanmar 3TNE68 Series Common Problems This Manual Covers
Hard starting from fuel starvation
Hard cold starts on these engines often trace back to a clogged filter element or a tired feed pump rather than the injectors. The Fuel Filter section lays out the strainer assembly, element, feed pump, and connecting pipes with part numbers, so you can renew the whole supply path instead of just the cartridge.
Manual Section: Fuel Filter p. 18Overheating under load
A stuck thermostat, a worn water pump, or a slipping V-belt will push a 3TNE68 hot long before anything shows on the gauge at idle. The Cooling Water System section lists the pump assembly, gasket, V-belt, pulley, fan, and the thermostat, which the catalog identifies as a 71 C opening unit.
Manual Section: Cooling Water System p. 11Low oil pressure
Low pressure after long oil intervals points at the oil pump, the pressure valve, or a starved intake pipe, and a lubrication failure is the fast road to bearing and crank damage. The Lub.Oil System section covers the pump assembly, filter, oil pressure valve, intake pipe assembly, and dipstick.
Manual Section: Lub.Oil System p. 10White smoke and rough running
Clogged or worn nozzles show up as white smoke, rough running, and uneven cylinders. The Fuel Injection Valve section identifies the nozzle assembly, injection pipes, and fuel overflow parts so a nozzle swap starts with the right numbers instead of a guess.
Manual Section: Fuel Injection Valve p. 17Injection pump wear from dirty fuel
Water or debris in the fuel wears the plunger and barrel and can leave the rack sticking, and this pump is the most expensive place on the engine to order the wrong part. The Fuel Injection Pump section breaks the pump assembly into plunger with barrel, delivery valve with seat, rack, and tappet assembly.
Manual Section: Fuel Injection Pump p. 14Low compression from worn rings
An engine that only lights off on glow plugs and blows smoke once running is often down on compression from worn rings or bores. The Crankshaft & Piston section lists the crankshaft assembly and piston with rings for a bottom-end rebuild order.
Manual Section: Crankshaft & Piston p. 9Slow or dead cranking
Worn brushes, a dragging armature, or a failed field coil will leave the starter clicking or cranking slow. The Starting Motor (Cold District) section shows the motor assembly broken down to armature, ball bearings, field coil assembly, and brushes.
Manual Section: Starting Motor (Cold District) p. 27Frequently Asked Questions
Which Yanmar engines does this parts catalog cover?
It covers the Yanmar 3TNE68-SA, 3TNE68-G1A, 3TNE68-G2A, 3TNE68C-SA, 3TNE68C-G1A, and 3TNE68-62A. Where a part differs between variants, the parts lists note which models it applies to, so check the remarks against your engine's model code before ordering.
Is this a service manual with torque specs and clearances?
No. This is the factory parts catalog: exploded views and OEM part numbers for every system, from cylinder block and cylinder head through the fuel injection pump, governor, and starting motor. Use it to identify and order the correct parts; pair it with a service manual for rebuild procedures.
Does it identify cooling system parts like the thermostat?
Yes. The Cooling Water System section lists the water pump assembly and gasket, V-belt, pulley, cooling fan, thermostat cover, and the thermostat itself, which the catalog identifies as a 71 C opening unit. The Radiator section that follows covers the radiator, fan shroud, sub-tank assembly, and drain cock. p. 11
Can I find fuel injection pump internals in it?
Yes. The Fuel Injection Pump section breaks the pump assembly down to the plunger with barrel, delivery valve with seat, rack, and tappet assembly, each with its OEM part number. The Governor section that follows covers the weight assembly, sleeve, and case parts. p. 14
How will I receive this Yanmar 3TNE68-SA & variants Parts Catalog?
This is a 28-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.
Am I able to print pages from this manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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