Part of the Yanmar Parts Manuals.
An engine on a stand with the crank out is a bad time to guess at bearing part numbers, and a Yanmar 4TN100L-RB is not an engine to order for from memory. This parts catalog, Yanmar publication Y00B4661, covers the 4TN100L-RB and the 4TN100L-RB (B7) build, and it exists so the numbers you read off the exploded views match what arrives in the box.
Forty-three pages walk the engine from cylinder block to governor: main and thrust bearings, gaskets and O-rings for the gear housing, the full lubrication and cooling water systems, piston and connecting rod assemblies, the fuel injection pump down to plunger, delivery valve and rack, and every link and spring inside the governor case.
It downloads as a PDF, so print the pages for the systems you have apart and let them get oily at the bench; the file stays clean on your drive.
What's Inside This Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 2-3 | Camshaft Bush, Main Bearing, Thrust Bearing, Piston Jet, Cylinder Head Bolt |
| Gear Housing | 4-5 | Oil Seal, Hydro Pump Gear, Ball Bearing, O-Ring, Gasket |
| Oil Seal Housing | 6-7 | Oil Seal Case, Oil Seal, Bolt |
| Lub.Oil System | 8-9 | Oil Sump, Oil Pump, Oil Level Gauge, Oil Filter, Drain Plug, Oil Pipe |
| Bonnet | 10-11 | Assembly, Breather Pipe, Breather Hose, Oil Supply Cap, Gasket, O-Ring |
| Cylinder Head | 12-13 | Suction Valve, Exhaust Valve, Valve Spring, Valve Stem Seal, Rocker Arm |
| Suction & Exhaust Manifold | 14-15 | Suction Manifold, Exhaust Manifold, Manifold Gasket, Air Heater, Switch, Bend |
| Camshaft & Driving Gear | 16-17 | Camshaft, Camshaft Gear, Fuel Injection Pump Gear, Tappet, Push Rod, Thrust Bearing |
| Crankshaft & Flywheel | 18-19 | Crankshaft Assy, Gear Crankshaft, Parallel Pin, V-Pulley Crankshaft, Flywheel Assy, Housing Flywheel |
| Piston & Connecting Rod | 20-21 | Piston W/RINGS, Ring Set, Pin Piston, Rod Assy Connecting, Bearing Crankpin, Bush Piston Pin |
| Cooling Water System | 22-23 | Pump Assy C.WATER, Gasket, O-Ring, Thermostat, Cover Thermostat, Switch Thermo |
| Oil Cooler Case | 24-25 | Case Assy Oil Cooler, Gasket, Bend, Cooler Oil, Plug, Sender Oil Pressure |
| Fuel Injection Pump | 26-27 | Pump Assy F.INJECT, Camshaft F.I.PUMP, Plunger W/BARREL, Tappet Assy, Valve W/SEAT Deliv, Rack |
| Governor | 28-43 | Case Governor, Link, Weight Assy Gov, Lever Assy Control, Lever Governor, Spring Governor |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Thermostat rating | 71BC | p. 22 |
| Main Bearing Undersize | 0.25U.S | p. 2 |
| Thrust Bearing Oversize | 0.25OS | p. 20 |
| Oil Seal Dimensions | 95x115x10 mm | p. 6 |
| Thermostat Opening Temperature | 71 °C | p. 22 |
| Governor Fuel Stop Motor Voltage | 12 V | p. 29 |
