Part of the Yanmar Parts Manuals.
"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 | Gear Housing Assy, Housing Cover Assy, Oil Seal HTC456208, Knock Pipe, Cover, Gasket, Lub. Oil Supply Cap, Blind Cover |
| Gear Housing | 5-6 | Lub. Oil Sump Assy, Oil Sump Spacer, Oil Seal Case Assy, Oil Seal, Flywheel Housing, Flywheel Cover Cap |
| Flywheel Housing & Lub. Oil Sump | 7-8 | Cylinder Head Assy, Suction Valve, Exhaust Valve, Valve Spring, Spring Retainer, Valve Stem Seal, Valve Cap, Nozzle Protector |
| Cylinder Head & Bonnet | 9-10 | Air Cleaner Support, Support Felt, Air Cleaner, Case, Air Cleaner Element, Dust Pan, Retainer, Air Intake Pipe |
| Suc. Manifold & Air Cleaner | 11-12 | Gasket, Silencer, Silencer Stay, Exhaust Manifold, Exhaust Manifold Gasket |
| Exh. Manifold & Silencer | 13-14 | Camshaft Assy, Camshaft Gear, Thrust Bearing, Push Rod, Tappet, Fuel Cam Bearing, Fuel Injection Pump Cam Assy, Idle Gear Retainer |
| Camshaft & Driving Gear | 15-16 | Crankshaft Assy, Crankgear, V-pulley, Flywheel Assy, Ring Gear, Piston w/ Rings, Ring Set, Piston w/ Ring |
| Crankshaft & Piston | 17-18 | Lub. Oil Pump Assy, Lub. Oil Pump Gasket, Lub. Oil Dipstick, Dipstick Guide, Oil Filter Bracket, Gasket, Lub. Oil Filter, Oil Press Valve Assy |
| Lub. Oil System | 19-20 | Cooling Water Pump Assy, Cooling Water Pump Gasket, V-belt, Cooling Water Pump V-pulley, Thermo Switch, Gasket, Thermostat Cover, Thermostat |
| Cooling Water System | 21-22 | 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 | 23-24 | Gasket, Fuel Feed Pump Assy, F.o Strainer Assy, Taper Valve, Taper Valve Spring, Lever, Strainer Cup, Retaining Ring |
| Fuel Pipe | 25-26 | Governor Case, Gasket, Governor Case Cover, Link Color, Link, Governor Weight Assy, Governor Sleeve, Spacer Assy |
| Governor | 27-28 | Starter 12V- .0W, Retainer, Yoke Assy, Armature Assy, Bearing, Starter Clutch, Starter Pinion, Shaft |
| Starting Motor | 29-30 | Generator, Collar, Plate Assy, Stator, Coupler, Flywheel Assy, Belt Adjuster |
| Generator | 31-32 | Flex Horn, Gasket Set, Bonnet Gasket, Exhaust Manifold Gasket, Cooling Water Pump Gasket, Liquid Gasket |
| 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.
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