Part of the Yanmar Parts Manuals.
An engine on a stand comes apart faster than it goes back together, and the part you cannot name is the part you cannot order. This Yanmar parts catalog, publication Y00B3601, identifies every component on the 3TNA72L-UB (K2103) three cylinder diesel, with the breakdown titled for the 3TNA72L-UBVM build. It runs the whole engine end to end: cylinder block, crankshaft and flywheel, piston and connecting rod, camshaft, fuel injection pump and valves, governor, cooling water pump, starting motor, generator, and glow plugs.
Each section pairs an exploded diagram with factory part numbers, so a worn bearing, a torn o-ring, or a stripped sump plug gets matched to the exact item instead of sitting apart another week while you guess. The catalog also lists 0.25 undersize main bearings and piston ring sets for regrind work.
It is a 56 page PDF with 28 bookmarked sections. Print the diagram you need and let it get dirty at the bench; the file stays clean.
What's Inside This 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 |
