All 56 pages of this Yanmar 3TNA72L-UB Parts Catalog (OEM #Y00B3601) cover one engine: the 3TNA72L-UBVM, cataloging every assembly from cylinder block and gear housing down to gasket sets and optional special tools. Inside, you get exploded-view diagrams with individual part numbers for every K2103 subassembly: crankshaft and flywheel, piston and connecting rod, fuel injection pump, governor, cooling water pump, and the complete fuel line and injection valve circuit. Each assembly has its own spread, so cross-referencing the correct part number against your variant takes seconds, not a phone call to the dealer. The starting motor runs at 12V-1.0W, the V-belt spec is FM=36.5, and main bearing undersize sits at 0.25. Those are the numbers your parts house needs to pull the right component. Wrong part, second freight charge. Bookmarked by system, this PDF lets you jump straight to your assembly, lock in the number, and order with confidence.
What's Inside This Yanmar 3TNA72L-UB Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Engine 3TNA72L-Ubvm | 1-2 | Cylinder Block, Gear Housing, Mounting Flange, Oil Seal Housing, Lub.Oil Sump, Cylinder Head, Rocker Arm, Bonnet, Air Cleaner, Suction & Exhaust Manifold, Silencer, Camshaft, Crankshaft & Flywheel, Piston & Connecting Rod, Driving Gear, Lub.Oil Pump, Lub.Oil Strainer, Cooling Water Pump, Thermostat, Fuel Injection Pump, Fuel Injection Valve, Fuel Line, Governor, Starting Motor, Generator, Glow Plug, Gasket Set & Special Tool |
| Lub. Oil Sump | 11-12 | Sump Assy, Plug, O-Ring, Spacer, Bolt |
| Lub. Oil Pump | 33-34 | Pump Assy, Gasket, Bolt |
| Lub. Oil Strainer | 35-36 | Bracket, Filter, O-Ring, Valve Assy, Pipe Assy, Nut |
| Gasket Set & Special Tool (Optional) | 55-56 | Gasket Set, Gasket, O-Ring, Flex Horn |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Bearing Undersize | 0.25 | p. 2 |
| Starter Voltage/Power | 12V-1.0W | p. 48 |
| V-Belt Type/Length | FM=36.5 | p. 36 |
| Governor Link Length (No Color) | 88.8 | p. 46 |
| Governor Link Length (White) | 88.6 | p. 46 |
| Governor Link Length (Red) | 89.0 | p. 46 |
| Piston Ring Set Undersize | 0.25 | p. 28 |
| Piston Bearing Undersize | 0.25 | p. 28 |
| O-Ring 1A P-32.0 Dimension | P-32.0 | p. 16 |
| O-Ring 1A S-25.0 Dimension | S-25.0 | p. 54 |
| O-Ring 1A S-24.0 Dimension | S-24.0 | p. 54 |
Yanmar 3TNA72L-UB Common Problems This Manual Covers
Yanmar 3TNA72L-UB starter solenoid part number needed for 12V system replacement p. 48
Locate the electrical components section starting at page 48, where the starter is listed at 12V-1.0W. Cross-reference the parts number list on page 2 to confirm the correct solenoid part number for your serial number range before ordering. Verify the part index entry matches your model variant (K2103, Y00B3601, or UBVM) since this manual covers five configurations.
Manual Section: Engine 3TNA72L-UbvmCorrect oil sump drain plug and O-ring part numbers hard to confirm from exploded view p. 11
Open the Lub. Oil Sump exploded view on page 11. The sump assembly listing includes the plug, O-ring, spacer, and bolts as separate line items. Match each part number against the parts number list on page 2. The O-ring dimension P-32.0 (part class 1A) is verified on page 16 , confirm that dimension against your physical sump plug before ordering to avoid a mis-fit.
Manual Section: Lub. Oil SumpCan't identify correct gasket set part number when ordering full engine overhaul kit p. 55
Go directly to page 55, the Gasket Set and Special Tool section. The gasket set is listed as a single assembly part number alongside individual gaskets and O-rings. Cross-reference piston ring set undersize (0.25, page 28) and piston bearing undersize (0.25, page 28) to determine whether a standard or undersize overhaul kit is needed before placing the order.
Manual Section: Gasket Set & Special Tool (Optional)Oil strainer filter and valve assembly part numbers unclear when sourcing replacement components p. 35
Check the Lub. Oil Strainer exploded view on page 35. The section breaks out the bracket, filter, O-ring, valve assembly, pipe assembly, and nut as individual parts. Identify each line item number separately. The O-ring S-25.0 (page 54) and S-24.0 (page 54) are the sealing dimensions most commonly needed , confirm which applies to your strainer connection before ordering.
Manual Section: Lub. Oil StrainerOil pump gasket part number needed after finding seepage at pump mating surface p. 33
Reference the Lub. Oil Pump section on page 33. The exploded view lists the pump assembly, gasket, and bolts as separate numbered parts. Pull the gasket part number from that diagram and verify it against the parts number list on page 2. Do not substitute a generic gasket , the listed part is the correct thickness and material for this engine family.
Manual Section: Lub. Oil PumpGovernor link part number unclear when there are three color-coded length variants listed p. 46
Find the governor link entries on page 46. Three variants are listed by color code: no-color (88.8mm), white (88.6mm), and red (89.0mm). Measure your existing link or check the original assembly record to confirm which length your engine uses before ordering. Installing the wrong length will affect throttle response across all five model variants covered by this catalog.
Manual Section: Engine 3TNA72L-UbvmFrequently Asked Questions
What are the replacement specifications for Starter Solenoid?
The manual identifies the magnetic switch (solenoid) for the starter motor as part number X0534006460. This component is part of the "Starting Motor" assembly. No further replacement specifications or details regarding specific failure modes are provided in this parts catalog.
How do you fix yanmar 3TNA72L-UB starter solenoid part number needed for 12V system replacement?
Locate the electrical components section starting at page 48, where the starter is listed at 12V-1.0W. Cross-reference the parts number list on page 2 to confirm the correct solenoid part number for your serial number range before ordering. Verify the part index entry matches your model variant (K2103, Y00B3601, or UBVM) since this manual covers five configurations.
How do you fix correct oil sump drain plug and O-ring part numbers hard to confirm from exploded view?
Open the Lub. Oil Sump exploded view on page 11. The sump assembly listing includes the plug, O-ring, spacer, and bolts as separate line items. Match each part number against the parts number list on page 2. The O-ring dimension P-32.0 (part class 1A) is verified on page 16 , confirm that dimension against your physical sump plug before ordering to avoid a mis-fit.
How do you fix can't identify correct gasket set part number when ordering full engine overhaul kit?
Go directly to page 55, the Gasket Set and Special Tool section. The gasket set is listed as a single assembly part number alongside individual gaskets and O-rings. Cross-reference piston ring set undersize (0.25, page 28) and piston bearing undersize (0.25, page 28) to determine whether a standard or undersize overhaul kit is needed before placing the order.
Is this Yanmar 3TNA72L-UB (K2103) & variants Parts Catalog a digital download?
A 56-page Parts Catalog in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Are there any print restrictions on this Yanmar 3TNA72L-UB (K2103) & variants?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Document Quality
This document is a scanned PDF with an OCR layer, so you can search and copy the full text. The text quality is crisp and easy to read throughout. Diagrams and illustrations are raster images, but their labels are clear and readable. Pages generally appear clean, though some exhibit minor scan artifacts and slight skewing typical of scanned materials. There are no notable blank or filler pages.
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