Part of the Yanmar Parts Manuals.
Strip a Yanmar 3TN66L-EUBA down to the block and you will be ordering parts within the hour: main bearings, valve stem seals, crankpin bearings, the gaskets to close it all back up. This 33-page parts catalog, Yanmar publication Y00B6331, is how you order the right ones the first time. Guessing costs real money; the wrong bearing shell or nozzle assembly means a second teardown while the correct part sits on a shelf somewhere else.
Fifteen sections cover the complete engine: cylinder block, gear housing, flywheel housing and oil sump, cylinder head, manifolds, camshaft, crankshaft and piston, the lubricating oil and cooling water systems, the fuel injection device, governor, starting motor, and generator. Rebuild sizes are listed too, including 0.25 oversize piston and ring sets and 0.25 undersize bearings.
Download the PDF, print the pages for the system you are in, and check off part numbers as the engine goes back together and runs again.
What's Inside This Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 3-4 | Gear Housing Assy, Gear Case Cover Assy, Oil Seal HTC456208, Knock Pipe, Cover, Gasket, Filler Cover, Blind Cover |
| Gear Housing | 5-6 | Flywheel Housing, Flywheel Cover Cap, Oil Seal Case Assy, Oil Seal, Oil Sump Spacer, Oilpan Assy, Oil Pan Assy |
| 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 | Intake Manifold, Suction Manifold Gasket, Air Hose, Air Cleaner, Unloader Valve, Element, Air Creaner Cover, Air Cleaner Support |
| Suc. Manifold & Air Cleaner | 11-12 | Exhaust Manifold, Exhaust Manifold Gasket, Bolt, Stud |
| Exh. Manifold | 13-14 | Camshaft Assy, Camshaft Gear, Thrust Bearing, Push Rod, Tappet, Fuel Cam Bearing, Fuel Injection Pump Cam Assy, Flange |
| Camshaft & Driving Gear | 15-16 | Crankshaft Assy, Flywheel W/ Ring Gear, Ring Gear, V-Pulley, Piston W/ Ring, Ring Set, Connecting Rod Assy, Piston Pin Bush |
| Crankshaft & Piston | 17-18 | Lub. Oil Pump Assy, Lub. Oil Pump Gasket, Dipstick Guide, Lub. Oil Dipstick, Lub. Oil Switch, Lub. Oil Filter, Oil Press Valve Assy, Oil Intake Pipe Assy |
| Lub. Oil System | 19-20 | Cooling Water Pump Assy, Cooling Water Gasket, Gasket, V-Belt, Cooling Water Pump V-Pulley, Cooling Fan, Spacer, Thermostat Cover |
| 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 | 23-25 | Governor Case Cover, Gasket, Governor Weight Assy, Governor Sleeve, Link Color, Link, Governor Case, Spacer Assy |
| Governor | 26-27 | Starter, Magnetic Switch, Rear Cover Assy, Starter Metal, Pinion Assy, Shift Lever Kit, Armature, Pinion Stopper Set |
| Starting Motor | 28-29 | Generator, Plate Assy, Stator, Bearing 6201ZZC3, Collar, Coupler, Flywheel, Pulley |
| Generator | 30-31 | Gasket Set, Valve Stem Seal, Nozzle Gasket, Bonnet Gasket, Suction Manifold Gasket, Exhaust Manifold Gasket, Lub. Oil Pump Gasket, Cooling Water Gasket |
| Gasket Set (Optional) & Tools | 32-33 | Gasket, (Non-Asb.), Seal, Valve Stem, Nozzle, Liquid |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Thermostat operating temperature | 71ßC | p. 20 |
| Thrust Bearing Undersize | 0.25US | p. 16 |
| O-Ring P-Type Size | 12.0 | p. 4 |
| Pipe Dimension | 12*700 | p. 8 |
| Piston with Ring Oversize | 0.25 | p. 16 |
| Ring Set Oversize | 0.25 | p. 16 |
| Pin Bearing Undersize | 0.25 | p. 16 |
| Oil Pressure Switch Setting | 0.5KG | p. 18 |
| Governor Link Length (No Color) | 88.8 | p. 24 |
| O-Ring S-Type Size | 7.0 | p. 24 |
| Wire Gauge/Diameter | 0.6 | p. 25 |
