Part of the Yanmar Parts Manuals.
Somewhere between a seized water pump and a parts counter that has never heard of a 3TNE68L-UBC, an engine sits waiting. This 32 page Yanmar parts catalog is how you stop guessing at numbers for the 3TNE68L-UBC industrial diesel, including the (B19) build, with exploded diagrams running from the Cylinder Block through the Governor, Starting Motor, and Generator.
Every wearing assembly gets its own plate: crankshaft and pistons with rings and bearings, camshaft and tappets, cylinder head with suction and exhaust valves, the fuel injection pump down to plunger and delivery valve, the lube oil pump and filter, and the cooling water pump with thermostat and V-belt.
Whether this engine lives in a genset, a pump set, or in pieces on your bench, the catalog turns a box of worn parts into an order that comes back right the first time.
What's Inside This Yanmar 3TNE68L-UBC, 3TNE68L-UBC (B19) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 3-4 | Gear Housing Assy, Gear Case Cover Assy, Oil Seal HTC456208, Knock Pipe, Cover, Gasket, Lub. Oil Supply Cap, Blind Cover |
| Gear Housing | 5-6 | Flywheel Housing, Flywheel Cover Cap, Oil Seal Case Assy, Oil Seal, Oil Sump Assy, Oil Sump Spacer |
| Flywheel Housing & Lub. Oil Sump | 7-8 | Head Bonnet Assy, Lub. Oil Supply Cap, Joint, Shelter Plate, Gasket, Bonnet Gasket, Pipe 12X, Knob |
| Cylinder Head & Bonnet | 9-10 | Suction Manifold, Suction Manifold Gasket, Exhaust Manifold, Exhaust Manifold Gasket |
| Suction & Exhaust Manifold | 11-12 | Camshaft Assy, Camshaft Gear, Thrust Bearing, Tappet, Push Rod, Fuel Cam Bearing, Fuel Injection Pump Cam Assy, Fuel Injection Pump Gear |
| Camshaft & Driving Gear | 13-14 | Crankshaft Assy, Crankshaft Gear, Flywheel Assy, Ring Gear, V-Pulley, Piston W/ Rings, Ring Set, Connecting Rod Assy |
| Crankshaft & Piston | 15-16 | Lub. Oil Pump Assy, Lub. Oil Pump Gasket, Dipstick Guide, Dipstick, Lub. Oil Filter, Oil Press Valve Assy, Oil Intake Pipe Assy, Oil Pressure Switch |
| Lub. Oil System | 17-18 | C.w Pump Assy, Cooling Water Pump Gasket, Thermo Switch, Gasket, Cooling Water Pump V-Pulley, V-Belt, Thermostat Cover, Thermostat |
| Cooling Water System | 19-20 | Fuel Injection Pump Assy, Plunger W/ Barrel, Retainer, Plunger Spring, Delivery Valve W/ Seat, Delivery Valve Spring, Delivery Valve Holder, Delivery Gasket |
| Fuel Injection Device | 21-22 | Fuel Pipe W/ Joint, Pipe Joint, Fuel Pipe, Fuel Oil Pipe Assy, Fo-T, Gasket, Pipe Joint Bolt Assy, Fuel Strainer |
| Fuel Line | 23-24 | Gasket, Governor Case Cover, Governor Weight Assy, Governor Sleeve, Governor Case, Link Color, Link, Spacer Assy |
| Governor | 25-26 | Starter, Amature Assy, Thrust Washer Kit, Pinion Stopper Set, Field Coil Assy, Brush, Rear Cover Assy, Starter Metal |
| Starting Motor | 27-28 | Generator, Collar, Plate Assy, Stator, Coupler, Flywheel Assy, Belt Adjuster |
| Generator | 29-32 | Gasket Set, Cylinder Head Gasket, Valve Stem Seal, Nozzle Gasket, Bonnet Gasket, Suction Manifold Gasket, Exhaust Manifold Gasket, Lub. Oil Pump Gasket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Plug type/size | PT1/8 | p. 2 |
| Bolt size | M 6X 12 PLATED | p. 2 |
| Bearing, Thrust size | .25US | p. 2 |
| Stud size | M 8X 22 | p. 4 |
| Oil Seal type | HTC456208 | p. 4 |
| O-Ring size | 1A P 12.0 | p. 4 |
| Fan diameter | D=290 | p. 18 |
| Pipe length | L=500 | p. 22 |
Yanmar 3TNE68L-UBC, 3TNE68L-UBC (B19) Common Problems This Manual Covers
Cooling water pump seal failure
A weeping pump and a slipping V-belt are the usual road to an overheated Yanmar diesel. The Cooling Water System plates identify the pump assembly, thermostat, thermo switch, V-pulley, and V-belt so you can replace the whole path in one order.
Manual Section: Cooling Water System p. 19Hard starting from contaminated fuel
Water and debris in the tank end up in the strainer and filter element, and the engine cranks without firing. The Fuel Line section diagrams the fuel pipes with joints, clamps, strainer, and element so you can renew the supply side end to end.
Manual Section: Fuel Line p. 23White smoke and worn injection parts
Poor combustion on a small Yanmar often traces to a tired plunger or dribbling nozzles. The Fuel Injection Device section breaks the pump down to plunger with barrel, delivery valve with seat, nozzle assemblies, and injection pipes.
Manual Section: Fuel Injection Device p. 21Low oil pressure warnings
A failing filter or oil pressure valve lets bearing debris circulate until the crank pays for it. The Lub. Oil System plates cover the lube oil pump assembly, filter, dipstick, oil pressure valve assembly, and pipes.
Manual Section: Lub. Oil System p. 17Rod and main bearing wear
Once the oil has gone metallic, the bottom end needs bearings, and often pistons with rings. The Crankshaft & Piston section lists the crankshaft assembly, connecting rod assemblies, bearings, pistons with rings, and pins for the rebuild.
Manual Section: Crankshaft & Piston p. 15Starter drags or fails to engage
Worn brushes, a lazy pinion, or a dead magnetic switch will strand an otherwise healthy engine. The Starting Motor section itemizes the armature assembly, pinion assembly, brushes, housing, gear, and magnetic switch.
Manual Section: Starting Motor p. 27Surging or hunting at idle
Erratic speed usually means tired governor springs or worn linkage rather than a fuel problem. The Governor section shows the governor case, weight assembly, shaft, lever assemblies, and springs so you can replace the worn pieces instead of adjusting around them.
Manual Section: Governor p. 25Frequently Asked Questions
Which engines does this parts catalog cover?
It covers the Yanmar 3TNE68L-UBC industrial diesel, including the 3TNE68L-UBC (B19) specification, from Yanmar's T-series line. If your engine plate reads 3TNE68L-UBC, this is the matching catalog.
Is this a service manual with torque specs and clearances?
No, this is a parts catalog. It gives exploded diagrams and part numbers for 14 sections, from Cylinder Block through Generator, so you can identify and order components. It does not contain repair procedures or torque data.
Does it break down the fuel injection pump?
Yes. The Fuel Injection Device section lists the injection pump assembly down to the plunger with barrel, delivery valve with seat, nozzle assemblies, and injection pipes, so you can order internals rather than a complete pump. p. 21
Are electrical parts like the starter and generator included?
Yes. The Starting Motor section covers the starter with armature assembly, pinion assembly, brushes, and magnetic switch, and a separate Generator section covers the stator, plate assembly, adjuster, and belt. p. 27
Do I get instant access to this Yanmar 3TNE68L-UBC Parts Catalog?
Instant PDF download. You get the full 32-page searchable Parts Catalog immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print a copy of this Yanmar 3TNE68L-UBC Parts Catalog for the shop?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
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