All 70 pages of this Yanmar 3TNA72L-UTB Parts Catalog (OEM #Y00B3761) cover one machine: the YB10-2 T-series vertical multi-cylinder diesel industrial engine. Open it to exploded views and factory part numbers for every major assembly, from cylinder block and gear housing to the fuel injection pump, governor, and starting motor. Each section lets you identify exactly which Yanmar component you need, with cross-references built in so you don't confuse a camshaft bearing for a crank-pin bush. Piston ring sets are listed at 0.25mm oversize, and the cooling water pump V-belt calls out at 36.5 FM length — the kind of detail that keeps you from ordering the wrong part twice. Stop squinting at a worn casting number hoping it matches something on a supplier's website. Bookmarked by assembly, so you jump straight to the fuel strainer or connecting rod, confirm your part number, and get on the phone with the parts desk.
What's Inside This Yanmar 3TNA72L-UTB (YB10-2) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Engine | 1 | - |
| Cylinder Block | 2-3 | Cylinder Block Assy, Main Bearing, Thrust Bearing, Camshaft Bush, Cylinder Head Gasket, Joint PT1, Gasket |
| Gear Housing | 4-5 | Gear Housing Assy, Gear Housing Cover, Oil Seal HTC456208, Knock Pipe, Generator Bracket |
| Gear Housing Blind Cover | 6-7 | Cover, Pump Cover Gasket, Lub. Oil Supply Cap, Hydraulic Oil Pump Cover, Blind Cover, F.feed Pump Gasket |
| Flywheel Housing | 8-9 | Flywheel Cover Cap, Bolt, Pin |
| Oil Seal Housing | 10-11 | Oil Seal, Pin, Bolt |
| Lub. Oil Sump | 12-13 | Lub. Oil Sump Assy, Oil Sump Spacer, Plug, O-Ring |
| Cylinder Head | 14-15 | Cylinder Head Assy, Suction Valve, Exhaust Valve, Valve Spring, Spring Retainer, Valve Stem Seal, Valve Cap, Nozzle Protector |
| Rocker Arm | 16-17 | Arm Support Assy, Rocker Shaft Assy, Rocker Arm Assy, Rocker Arm Support, Spring |
| Bonnet | 18-19 | Lub. Oil Supply Cap, Knob, Head Bonnet Assy, Joint, Shelter Plate, Plate Gasket, Bonnet Gasket, Pipe 12X |
| Air Cleaner | 20-21 | Case Assy, Dust Pan Assy, Retainer, Air Cleaner Element, Air Intake Pipe, Suction Pipe, Air Cleaner Support |
| Suction Manifold | 22-23 | Air Intake Manifold, Int.manifold Gasket, Bolt |
| Exhaust Manifold | 24-25 | Exhaust Manifold Gasket, Washer, Bolt |
| Camshaft | 26-27 | Bearing, Fuel Injection Pump Camshaft, Camshaft Gear, Tappet, Push Rod, Fuel Injection Pump Gear |
| Crankshaft | 28-29 | Crankshaft Assy, Crankshaft Gear, V-pulley, Key |
| Flywheel | 30-31 | Flywheel Assy, Ring Gear, Bolt, Pin |
| Piston | 32-33 | Piston w/ Rings, Ring Set, Pin, Circlip |
| Connecting Rod | 34-35 | Connecting Rod Assy, Crank-pin Bearing, Piston Pin Bush, Bolt |
| Driving Gear | 36-37 | Idle Gear Retainer, Idle Gear Shaft, Idle Gear w/ Bush, Idle Gear Bush |
| Lub. Oil Pump | 38-39 | Pump Assy, Lub. Oil, Gasket, L.O.PUMP, Bolt M 6X 20 |
| Lub. Oil System | 40-41 | Lub. Oil Dipstick, Dipstick Guide, Oil Filter Bracket, Bracket Gasket, Lub. Oil Filter, Oil Press Valve Assy, Lub. Oil Pipe Assy, Oil Pressure Switch |
| Cooling Water Pump | 42-43 | Cooling Water Pump Assy, Cooling Water Pump Gasket, V-belt, Cooling Water Pump V-pulley, V-pulley, Cooling Fan, Sub Reservoir Assy, Reservoir Tank Cap |
| Thermostat | 44-45 | Gasket, Thermometer, Thermostat Cover, Thermo.cover Gasket |
| Fuel Injection Pump | 46-47 | Fuel Injection Pump Assy, Plunger w/ Barrel, Retainer, Plunger Spring, Delivery Valve w/ Seat, Delivery Valve Spring, Delivery Valve Holder, Delivery Gasket |
| Fuel Injection Valve | 48-49 | Fuel Injection Valve Assy, Nozzle Assy.fuel Injection, Valve w/ Case Holder, Valve Spring, Seat Spring, Valve Stop Spacer |
| Fuel Strainer | 50-51 | Fuel Strainer Assy, Strainer Body Assy, Taper Valve Spring, Cock Handle, Taper Valve, Spring, Fuel Element, Retaining Ring |
| Fuel Injection Line | 52-53 | Injection Pipe Retainer, Fuel Inject Pipe, Bolt |
| Fuel Line | 54-55 | Fuel Oil Pipe, Gasket, Pipe, Feed Pump |
| Fuel Return Line | 56-57 | Fuel Over Pipe Assy, Joint, Fuel Return Pipe, Gasket |
| Governor | 58-59 | Governor Case Gasket, Governor Case Cover, Governor Weight Assy, Governor Sleeve, Governor Case, Link Color, Spacer Assy, Governor Lever Shaft |
| Control System | 60-61 | Torque Spring Assy, Lead, Wire, Nut |
| Starting Motor | 62-63 | Starter 12V- .0W, Retainer, Yoke Assy, Armature Assy, Bearing, Starter Clutch, Starter Pinion, Shaft |
| Generator | 64-65 | Plate Assy, Stator, Coupler, Collar, Pulley, Flywheel Assy, Belt Adjuster |
| Glow Plug | 66-67 | - |
| Gasket Set & Special Tool (Op) | 68-70 | Gasket Set, Cylinder Head Gasket, Pump Cover Gasket, F.feed Pump Gasket, Plate Gasket, Bonnet Gasket, Int.manifold Gasket, Silencer Gasket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Bearing Undersize | 0.25 | p. 2 |
| Piston Ring Set Oversize | 0.25 | p. 32 |
| Connecting Rod Bearing Undersize | 0.25 | p. 34 |
| V-Belt Length | 36.5 FM | p. 42 |
| Pipe Dimension | 7X 130 | p. 42 |
| Governor Link Length (No Color) | 88.8 | p. 58 |
| Governor Link Length (White) | 88.6 | p. 58 |
| Governor Link Length (Red) | 89.0 | p. 58 |
Yanmar 3TNA72L-UTB (YB10-2) Common Problems This Manual Covers
Yanmar YB10-2 fuel injection nozzle part number unclear, need correct nozzle assembly for hard-starting engine p. 48
Turn to the Fuel Injection Valve parts list on page 48. Locate the Nozzle Assy and Valve Assy entries with their part numbers, then cross-reference the Nozzle Holder, Spring, and Shim Pack components listed on the same spread. Order all sub-components of the nozzle assembly together — the shim pack thickness affects injection pressure, so verify the full assembly matches your serial number range before ordering.
Manual Section: Fuel Injection ValveNeed oil filter and lubrication pump part numbers after bearing damage from oil contamination p. 40
Check the Lub. Oil System parts list on page 40 for the Oil Filter part number and the Oil Press Valve Assy. Then turn to the Lub. Oil Pump diagram on page 38 to identify the Pump Assy part number separately. Order both assemblies together when rebuilding after contamination events — the pump gasket (L.O.PUMP Gasket) is a separate line item on page 38.
Manual Section: Lub. Oil SystemFuel injection pump plunger and barrel part numbers needed for replacement after contaminated fuel failure p. 46
Open the Fuel Injection Pump section on page 46. The Plunger W/BARREL is listed as a matched assembly — do not order plunger and barrel separately. Also identify the Delivery Valve W/SEAT, Spring, and Shim Pack on the same page. The complete Pump Assy part number is at the top of the list if replacing the whole unit rather than sub-components.
Manual Section: Fuel Injection PumpAir cleaner element part number needed, unsure which element fits this engine p. 20
Locate the Air Cleaner section on page 20. The Element part number is listed under the Case Assy breakdown alongside the Dust Pan Assy and Air Intake Pipe. Note the Cleaner Assy top-level part number as well, since some suppliers list replacement elements by the parent assembly reference. Confirm against the parts diagram on the same spread before ordering.
Manual Section: Air CleanerValve seat and cylinder head gasket part numbers required for compression loss repair parts order p. 14
Find the Cylinder Head parts list starting on page 14 for valve seat components. For the head gasket, cross-reference the Gasket Set section on page 68, where the Cyl. Head Gasket is listed as an individual line item within the gasket set. The full Gasket Set part number on page 68 covers the complete engine reseal if multiple gaskets are needed.
Manual Section: Cylinder HeadWiring harness connector part numbers missing, intermittent no-start traced to starting motor circuit p. 62
Review the Starting Motor parts list on page 62. The Yoke Assy, Armature Assy, Clutch, and Pinion are each separate line items — identify which sub-component corresponds to the faulty connection. Page 63 covers the electrical parts breakdown of the starter specifically. For glow plug circuit connectors, check page 66 for glow plug part numbers that may ship with associated wiring terminals.
Manual Section: Starting MotorFrequently Asked Questions
What are the replacement specifications for fuel injection nozzle?
For the fuel injection nozzle, the replacement specification is part number 119620-53000, which is a "NOZZLE ASSY.F.INJECT." and is required in a quantity of 3.
What are the replacement specifications for fuel injection plunger?
For the fuel injection plunger, the replacement specification is part number 119620-51101, which is a "PLUNGER W/BARREL" and is required in a quantity of 3.
How do you fix yanmar YB10-2 fuel injection nozzle part number unclear, need correct nozzle assembly for hard-starting engine?
Turn to the Fuel Injection Valve parts list on page 48. Locate the Nozzle Assy and Valve Assy entries with their part numbers, then cross-reference the Nozzle Holder, Spring, and Shim Pack components listed on the same spread. Order all sub-components of the nozzle assembly together — the shim pack thickness affects injection pressure, so verify the full assembly matches your serial number range before ordering.
How do you fix need oil filter and lubrication pump part numbers after bearing damage from oil contamination?
Check the Lub. Oil System parts list on page 40 for the Oil Filter part number and the Oil Press Valve Assy. Then turn to the Lub. Oil Pump diagram on page 38 to identify the Pump Assy part number separately. Order both assemblies together when rebuilding after contamination events — the pump gasket (L.O.PUMP Gasket) is a separate line item on page 38.
Is this Yanmar 3TNA72L-UTB (YB10-2) & variants Parts Catalog a digital download?
A 70-page Parts Catalog in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print specific sections of this Yanmar 3TNA72L-UTB (YB10-2) & variants?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Document Quality
This document is a scanned PDF with an OCR layer, allowing you to search and copy text throughout. The text quality is generally clear and readable, both for the OCR-generated content and the original text within the scanned images. Diagrams and illustrations are scanned raster images; they are mostly clear, and labels are readable, though they will pixelate when significantly magnified. Pages exhibit typical scan artifacts such as slight skewing and minor background discoloration, but no major stains or marks obscure the content.
Reviews
There are no reviews yet.