Part of the Yanmar Parts Manuals.
An injection pump that leaks past the plunger will keep a 3TNE68 on the stand until you can put the right part number on an order form, and guessing from a cross reference is how the wrong nozzle ends up in your cylinder head. This PDF is the Yanmar parts catalog for the 3TNE68-ENBAC diesel, publication number Y00V3629-1.
Its 32 pages break the engine into fifteen systems, from the cylinder block, crankshaft and piston group through the fuel injection device, governor and cooling water system to the starting motor and generator. Each section lists the factory numbers for assemblies and individual components, including undersize thrust bearing options for a rebuild and an optional gasket set.
Whether this engine sits in a tractor, a genset, a boat or a pump, the part numbers are the same. Print the pages you need, take them to the bench, and order once instead of three times.
What's Inside This Yanmar 3TNE68-ENBAC, 3TNE68, Y00V3629 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 2-3 | Cylinder Block Assy, Main Bearing, Thrust Bearing, Bush, Cylinder Head Gasket, Joint PT1 |
| Gear Housing | 4-5 | Gear Case Cover Assy, Oil Seal HTC456208, Gear Case Cmp, Lub. Oil Pump Assy, Cover, Gasket, Pipe Knock, Lub. Oil Supply Cap |
| Flywheel Housing & Oil Sump | 6-7 | Flywheel Housing, Flywheel Cover Cap, Oil Seal, Oil Sump Assy |
| Cylinder Head & Bonnet | 8-9 | Bonnet Assy, Lub. Oil Supply Cap, Breather Joint, Shelter Plate, Gasket, Bonnet Gasket, Pipe 12X, Knob |
| Suc. & Exh. Manifold | 10-11 | Intake Manifold, Suction Manifold Gasket, Exhaust Manifold, Exhaust Manifold Gasket |
| Camshaft & Driving Gear | 12-13 | Camshaft Assy, Camshaft Gear, Thrust Bearing, Tappet, Push Rod, Retainer, Fuel Injection Pump Cam Assy, Fuel Injection Pump Gear |
| Crankshaft & Piston | 14-15 | Crankshaft Assy, Crankshaft Gear, Flywheel Assy, Ring Gear, V-Pulley, Piston W/ Rings, Ring Set, Connecting Rod Assy |
| Lub. Oil System | 16-17 | Dipstick Guide, Dipstick, Lub. Oil Filter, Oil Intake Pipe Assy, Lub. Oil Switch |
| Cooling Water System | 18-19 | Cooling Water Pump Assy, Cooling Water Pump Gasket, Thermo Switch, Gasket, Joint, Joint O_ring, V-Pulley, V-Belt |
| Fuel Injection Device | 20-21 | Fuel Injection Pump Assy, Plunger W/ Barrel, Retainer, Plunger Spring, Delivery Valve W/ Seat, Delivery Valve Spring, Delivery Valve Holder, Delivery Gasket |
| Fuel Pipe | 22-23 | Fuel Pipe W/ Joint, Pipe Joint, Fuel Oil Pipe Assy, Fo-T, Pipe Joint Bolt Assy, Fuel Strainer, Taper Valve Spring |
| Governor | 24-25 | Gasket, Governor Case Cover, Governor Weight Assy, Spacer, Governor Sleeve, Governor Case, Link Color, Shaft |
| Starting Motor | 26-27 | 12V- .8KW Starter, Shift Lever Kit, Pinion Stopper Set, Thrust Washer Kit, Armature, Rear Cover Assy, Brush Holder Assy, Brush |
| Generator | 28-29 | Collar, Plate Assy, Stator, Coupler, Flywheel Assy, V-Belt Adjuster, Spacer |
| Gasket Set (Optional) & Tools | 30-32 | Gasket Set, Cylinder Head Gasket, Valve Stem Seal, Nozzle Gasket, Bonnet Gasket, Suction Manifold Gasket, Exhaust Manifold Gasket, Cooling Water Pump Gasket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Thrust Bearing Undersize | 0.25US | p. 14 |
| Lub. Oil Pressure Switch Setting | 0.5KG | p. 16 |
| V-Belt Length | 35.0 | p. 18 |
| Starter Motor Rating | 12V-0.8KW | p. 26 |
Yanmar 3TNE68-ENBAC, 3TNE68, Y00V3629 Common Problems This Manual Covers
Worn bearings found at teardown
Miking the crank after a low oil pressure event often means ordering bearings, and the catalog lists the crankshaft, connecting rod and bearing part numbers, including a 0.25US thrust bearing for a reground shaft.
Manual Section: Crankshaft & Piston p. 14Injector and pump wear from dirty fuel
Contaminated fuel wears nozzles and the plunger and barrel, showing up as smoke and rough running. The catalog identifies the injection pump assembly, plunger with barrel, nozzle assemblies, injection pipes and rack so you can order exactly the wear parts you need.
Manual Section: Fuel Injection Device p. 20Hard starting from air in the fuel
Air drawn past a tired feed pump or a clogged strainer makes any small diesel a hard starter. The fuel feed pump, strainer, element, pipes with joints and clamps are all itemized here.
Manual Section: Fuel Pipe p. 22Overheating and cooling water leaks
A failing water pump or slack V-belt lets temperature climb until the engine shuts down. This section lists the cooling water pump assembly and gasket, thermo switch, V-pulley and fan by part number.
Manual Section: Cooling Water System p. 18Low oil pressure warnings
Before condemning the bottom end, check the lubrication side: the catalog covers the oil filter, oil intake pipe assembly, dipstick guide and the oil pressure switch, which carries a 0.5KG setting in the listing.
Manual Section: Lub. Oil System p. 16Starter clicks but will not crank
A worn pinion or a dead magnetic switch is a cheap fix if you can identify the pieces. The starting motor breakdown lists the 12V-0.8KW starter along with the pinion assembly, shift lever kit, armature and magnetic switch assembly.
Manual Section: Starting Motor p. 26Gaskets needed for reassembly
Every teardown ends with a pile of gaskets you cannot reuse. The optional gasket set listing covers the cylinder head gasket, nozzle gasket, O-rings and seal washers in one order.
Manual Section: Gasket Set (Optional) & Tools p. 30Frequently Asked Questions
Which engine does this parts catalog cover?
It covers the Yanmar 3TNE68-ENBAC three cylinder diesel, Yanmar publication Y00V3629-1. Because it is an engine catalog, it applies regardless of what the engine is installed in.
Is this a service manual with torque specs and procedures?
No. This is a parts catalog: 32 pages of factory part number listings organized into fifteen systems, from cylinder block to generator. Use it to identify and order correct components, not for step by step repair procedures.
Does it cover the fuel injection system?
Yes. The Fuel Injection Device section lists the injection pump assembly, plunger with barrel, nozzle assemblies, injection pipes and rack, and the separate Fuel Pipe section covers the feed pump, strainer, element and fuel lines. p. 20
Are rebuild sizes like undersize bearings listed?
Yes. The Crankshaft & Piston section includes the crankshaft assembly, piston with rings, connecting rod assemblies and bearings, with a 0.25US thrust bearing listed for reground crankshafts. p. 14
What format is this manual in?
A 32-page Parts Catalog in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Is printing allowed for this Yanmar 3TNE68-ENBAC Parts Catalog?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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