Tracking down the exact replacement numbers for your engine is straightforward with this 38-page Yanmar TB015, 3TNA72L-UTBZ parts catalog PDF. Inside, you get detailed exploded diagrams showing every individual component of the cylinder block, gear housing, and fuel injection pump assemblies. Open this complete reference to find full parts lists with exact OEM numbers for the entire cooling water system, governor, and optional gasket sets. Verify the main bearing undersize is listed at 0.25US and confirm you are ordering the correct 71°C thermostat for your specific machine. Stop wasting days waiting on the wrong components to arrive from generic diagrams. This bookmarked file jumps straight to the system you need, so you can grab the correct part number and get your equipment back in the dirt.
What's Inside This Yanmar 3TNA72L-UTBZ Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 11 | Block Assy, Cylinder, Plug PT1/4, Bolt, Main Bearing, Bearing, Thrust, Gasket |
| Gear Housing | 12 | Cover Assy, Housing, Oil Seal, O-Ring, Bolt, Housing Assy, Gear, Gasket |
| Mounting Flange & Lub.Oil Sump | 13 | Parallel Pin, Housing, Flywheel, Bolt, Oil Seal Case, Lub. Oil Sump Assy, Drain Plug |
| Cylinder Head & Bonnet | 14 | Head Assy, Cylinder, Valve Guide, Valve, Suction, Valve Spring, Valve Stem Seal, Bonnet Assy |
| Suc.Manifold $Air Cleaner | 15 | - |
| Exh.Manifold &Silencer | 16 | - |
| Camshaft & Driving Gear | 17 | Tappet, Push Rod, Camshaft Assy, Camshaft Gear, Idle Gear, Fuel Cam Assy |
| Crankshaft & Piston | 18 | Crankshaft Assy, Crankshaft Gear, Flywheel Assy, Piston W/RINGS, Connecting Rod Assy, Crankpin Bearing |
| Lub.Oil System | 19 | Pump Assy, Lub. Oil, Dipstick, Oil Filter, Oil Press Valve, LUB.OIL Pipe, Oil Pressure Switch |
| Cooling Water System | 20 | Cw Pump, V-Belt, Fan, Thermostat, Radiator, Water Pipe |
| Fuel Oil Injection Pump | 21 | F.INJECT. Pump, Plunger, Delivery Valve, Rack, Pinion, Tappet |
| Governor | 22 | Case, Driving Set, Weight, Lever, Regulator Shaft, Torque Spring |
| Fuel Oil Injection Valve | 23 | Nozzle Assy, F.INJECT., Valve Holder, Injection Pipe, Fuel Over Pipe, Fuel Return Pipe |
| Fuel Oil Pipe | 24 | Pipe Joint, Fuel Strainer, Fuel Element, Water Separator, Feed Pump |
| Starting Motor | 25 | Starter, Armature Assy, Clutch, Pinion, Housing, Magnetic Switch |
| Generator | 26 | Stator, Coupler, Flywheel, Belt Adjuster, Charging Indicator |
| Gasket Set(Optional) | 27 | Gasket, Cyl. Head, (Non-ASB.), Seal, Valve Stem, Protector, Nozzle |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Thermostat operating temperature | 71°C | p. 20 |
| Main Bearing Undersize | 0.25US | p. 11 |
| Spring Pin dimensions | 4X10 mm | p. 12 |
| Parallel Pin dimensions | 8X16 mm | p. 13 |
| Seal Washer size | 22S | p. 13 |
| Vinyl Pipe dimensions | 12X 500 mm | p. 14 |
| Cotter size | 25 | p. 24 |
| Thermostat opening temperature | 71°C | p. 20 |
Yanmar 3TNA72L-UTBZ Common Problems This Manual Covers
Yanmar TB015 or 3TNA72L-UTBZ engine overheating quickly with fluctuating temperature and water pump noise p. 20
Inspect the Cooling Water System breakdown on page 20 to identify the correct part number for the 71°C thermostat. Cross-reference the water pump assembly and V-belt part numbers before ordering replacements. Verify the correct gasket sizes in the parts list.
Manual Section: Cooling Water SystemEngine displaying low oil pressure warnings followed by bearing seizure or lower end crank damage p. 11
Check the engine parts diagram on page 11 to locate the main bearing part numbers. Order the specific 0.25US undersize main bearing if your crankshaft requires machining. Review the block assembly exploded view to find corresponding thrust bearings and gaskets.
Manual Section: Cylinder BlockHard starts in cold weather with white smoke and poor low-RPM performance p. 24
Locate the fuel strainer and feed pump part numbers in the exploded view on page 24. Match the size 25 cotter pin and pipe joints to your exact setup. Verify all fuel pipe replacement parts match the listed index codes.
Manual Section: Fuel Oil PipeExcessive oil leaking from the lower engine block area near the flywheel p. 13
Examine the exploded view on page 13 to find the correct oil seal case and drain plug part numbers. Select the proper 22S seal washer and 8X16 mm parallel pin from the component list. Order the complete lubricating oil sump assembly if cracked.
Manual Section: Mounting Flange & Lub.Oil SumpFrequently Asked Questions
What are the replacement specifications for Fuel filter?
The manual identifies the fuel filter element as part number 124550-55700, described as "ELEMENT, FUEL", located in the Fuel Oil Pipe section. However, it does not provide replacement specifications or intervals for this part.
What are the replacement specifications for Oil filter?
The manual identifies the lubrication oil filter as part number 119305-35150, described as "FILTER, LUB. OIL", found in the Lub. Oil System section. However, it does not provide replacement specifications or intervals for this part.
How do you fix yanmar TB015 or 3TNA72L-UTBZ engine overheating quickly with fluctuating temperature and water pump noise?
Inspect the Cooling Water System breakdown on page 20 to identify the correct part number for the 71°C thermostat. Cross-reference the water pump assembly and V-belt part numbers before ordering replacements. Verify the correct gasket sizes in the parts list.
How do you fix engine displaying low oil pressure warnings followed by bearing seizure or lower end crank damage?
Check the engine parts diagram on page 11 to locate the main bearing part numbers. Order the specific 0.25US undersize main bearing if your crankshaft requires machining. Review the block assembly exploded view to find corresponding thrust bearings and gaskets.
How will I receive this Yanmar TB015, 3TNA72L-UTBZ Parts Catalog?
This is a 38-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.
Can I print this manual?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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