"This official Yanmar 3TNA72L-UBA/UBB Engine Parts Catalog (OEM #Y00B5881) delivers 34 pages of factory exploded views and exact part numbers for every major assembly — cylinder block, gear housing, fuel injection device, and more. Whether you need oversize piston ring sets, cooling water pump assemblies, or fuel strainer part numbers, every component is mapped by figure and position number. Covers UBA and UBB variants so you order the right part the first time."
What's Inside This Yanmar 3TNA72L-UBA, 3TNA72L-UBB, 3TNA72L-UBA/UBB Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 3-4 | Block Assy, Cylinder, Plug, Main Bearing, Bearing, Thrust, Bush, Camshaft |
| Gear Housing | 5-6 | Housing Assy, Gear, Plug, Spring Pin, Seal, O-Ring, Bolt |
| Flywheel Housing & Lub. Oil Sump | 7-8 | Sump Assy, Lub. Oil, Drain Plug, Seal Washer, Spacer, Oil Sump, Case Assy, Oil Seal |
| Cylinder Head & Bonnet | 9-10 | Head Assy, Cylinder, Valve, Arm Assy, Rocker, Gasket, Bonnet Assy, Plug |
| Suc. Manifold & Air Cleaner | 11-12 | - |
| Exh. Manifold & Silencer | 13-14 | - |
| Camshaft & Driving Gear | 15-16 | - |
| Crankshaft & Piston | 17-18 | - |
| Lub. Oil System | 19-20 | Pump Assy, Lub. Oil, Dipstick, Filter, Valve Assy, Oil Press |
| Cooling Water System | 21-22 | Pump Assy, C.WATER, V-Belt, V-Pulley, C.W. Pump, Switch, Thermo, Thermostat |
| Fuel Injection Device | 23-24 | Pump Assy, F.INJECT., Plunger W/BARREL, Valve W/SEAT, Deliv., Nozzle Assy, F.INJECT, Pipe (1) |
| Fuel Pipe | 25-26 | Pump Assy, Fuel Feed, Strainer Assy, F.O., Valve, Taper, Pipe, Fuel (D12XL400) |
| Governor | 27-28 | Case, Cover, Link, Weight Assy, Gov., Shaft, Lever |
| Starting Motor | 29-30 | Starter 12V-1.0W, Yoke Assy, Armature Assy, Clutch, Starter, Pinion, Housing |
| Generator | 31-32 | Washer, Spring, Plate Assy, Stator, Coupler, Flywheel Assy |
| Gasket Set (Optional) & Tool | 33-34 | Flex Horn, Gasket SET(NON-ASB.), Gasket, Bonnet, O-Ring, EXH.MANIFOLD |
Yanmar 3TNA72L-UBA, 3TNA72L-UBB, 3TNA72L-UBA/UBB Common Problems This Manual Covers
Need to find the correct oversize piston ring part numbers for Yanmar 3TNA72L-UBA after heavy block wear p. 16
Inspect the diagram on page 16 to find the exact part numbers for the piston and ring set. Select the 0.25 mm oversize ring set option from the parts list to match your machined block. Cross-reference the part number with your specific engine serial number before ordering.
Manual Section: Camshaft & Driving GearCan't locate the replacement thermostat assembly number for an engine running hot and fluctuating temperature p. 20
Review the parts list on page 20 to identify the correct cooling system components. Find the exact part number for the thermostat assembly rated for a 71 °C opening temperature. Match this part number against the exploded view to ensure you order the right O-rings and gaskets simultaneously.
Manual Section: Lub. Oil SystemTrying to track down the correct V-belt part number after a snapped belt and severe overheating p. 20
Look at the parts breakdown on page 20 to locate the proper drive belt part number. Confirm you are selecting the V-belt specified with a 36.5 inches length. Verify the pulley part numbers in the same diagram if the old belt caused any groove wear before ordering replacements.
Manual Section: Lub. Oil SystemNeed the correct governor link rod part number to fix erratic surging and rough running p. 26
Check the parts diagram on page 26 to identify the proper governor linkage components. Select the specific part number for the governor link rod measuring exactly 88.8 mm, designated as the no-color option. Match the hardware part numbers in the exploded view to replace worn connection pins.
Manual Section: Fuel PipeFrequently Asked Questions
What are the replacement specifications for fuel filters?
The manual lists a "STRAINER ASSY, F.O." with part number 119632-55620, which functions as a filter within the fuel feed system. While a specific fuel filter element part number or replacement interval is not explicitly detailed, this strainer is a key filtering component. Refer to page 25, Fig. 12 for an illustration of the fuel pipe system.
What are the replacement specifications for water pump impeller?
The manual lists the "PUMP ASSY, C.WATER" with part number 119660-42005 as a complete assembly within the cooling water system. There are no separate replacement specifications or part numbers provided for the water pump impeller itself, as it is included as part of the pump assembly. Refer to page 21, Fig. 10 for an illustration of the cooling water system.
How do you fix need to find the correct oversize piston ring part numbers for 3TNA72L-UBA after heavy block wear?
Inspect the diagram on page 16 to find the exact part numbers for the piston and ring set. Select the 0.25 mm oversize ring set option from the parts list to match your machined block. Cross-reference the part number with your specific engine serial number before ordering.
How do you fix can't locate the replacement thermostat assembly number for an engine running hot and fluctuating temperature?
Review the parts list on page 20 to identify the correct cooling system components. Find the exact part number for the thermostat assembly rated for a 71 °C opening temperature. Match this part number against the exploded view to ensure you order the right O-rings and gaskets simultaneously.
What format is this 3TNA72L-UBA manual in?
Immediate download of the complete 34-page searchable Parts Catalog. Access it on any device, from a laptop at your desk to a phone in the field.
Am I able to print pages from this 3TNA72L-UBA?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
Document Quality
This document is a mixed-format PDF. The parts list pages feature crisp, searchable text, indicating a digital text layer. However, the accompanying diagram pages are scanned images, meaning text within these illustrations is not searchable. All text, both in the parts lists and on the diagrams, is clear and easy to read. The diagrams themselves are sharp raster images, and all labels are fully readable. The document is clean throughout, free of scan artifacts, stains, or skewed pages.
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