Part of the Yanmar Parts Manuals.
The fastest way to stall a rebuild on a Yanmar 3TN66L-(E)UB is to order the wrong bearing, because this engine turns up under several designations. This parts catalog, Yanmar publication Y00B4522, applies whether your data plate reads 3TN66L-(E)UB, 3TN66L-EUB, or 3TN66L-UB, so the part numbers you pull match the engine on your stand.
Across 35 pages it breaks the engine into part groups: cylinder block, cylinder head and bonnet, camshaft, crankshaft and piston, the lubricating oil and cooling water systems, fuel injection device, fuel pipe, governor, starting motor, generator, and the gasket set with tools. Exploded views sit beside the listings, so you count washers and O-rings instead of guessing.
At 0.65 MB the PDF rides along on a phone to the parts counter as easily as it opens on a laptop beside the bench. When the head is off and you need the valve guides and bonnet gasket identified before reassembly, the right number is a bookmark away.
What's Inside This Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Engine Information | 1 | Cylinder Block, Gear Housing, Flywheel Housing & L.O. Sump, Cylinder Head & Bonnet, Suction & Exhaust Manifold, Camshaft & Driving Gear, Crankshaft & Piston, Lub.Oil System, Cooling Water System, Fuel Injection Device, Fuel Pipe, Governor, Starting Motor, Generator, Gasket Set & Tools |
| Cylinder Block | 2-3 | Cylinder Block Assy, Main Bearing, Thrust Bearing, Camshaft Bush, Bush, Joint PT1, Cylinder Head Gasket, Gasket |
| Flywheel Housing & L.O. Sump | 6-7 | Flywheel Housing, Flywheel Cover Cap, Lub. Oil Sump Assy, Oil Sump Spacer, Oil Seal Case Assy, Oil Seal Housing, Oil Seal |
| Cylinder Head & Bonnet | 8-10 | Bonnet Assy, Filler Cover, Joint, Breather Joint, Shelter Plate, Gasket, Bonnet Gasket, Vinyl 12X Pipe |
| Suction & Exhaust Manifold | 11-12 | Suction Manifold, Intake Manifold, Suction Manifold Gasket, Exhaust Manifold, Exhaust Manifold Gasket |
| Camshaft & Driving Gear | 13-14 | Camshaft Assy, Camshaft Gear, Thrust Bearing, Tappet, Push Rod, Fuel Cam Bearing, Fuel Injection Pump Cam Assy, Flange |
| Crankshaft & Piston | 15-16 | Crankshaft Assy, Flywheel Assy, Ring Gear, V-pulley, Piston w/ Ring, Ring Set, Connecting Rod Assy, Crankpin Bearing |
| Lub.Oil System | 17-18 | Lub. Oil Pump Assy, Lub. Oil Pump Gasket, Dipstick Guide, Dipstick, Lub. Oil Filter, Oil Press Valve Assy, Lub. Oil Inlet Pipe Assy, Oil Pressure Switch |
| Cooling Water System | 19-20 | C.w Pump Assy, Cooling Water Pump Assy, Cooling Water Pump Gasket, Cooling Water Gasket, Gasket, Cooling Water Pump V-pulley, V-belt, Fan |
| Fuel Injection Device | 21-23 | Fuel Injection Pump Assy, Plunger w/ Barrel, Retainer, Plunger Spring, Delivery Valve w/ Seat, Delivery Valve Spring, Delivery Valve Holder, Delivery Gasket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Oil Pressure Switch Setting | 0.5KG | p. 17 |
| Governor Link Length (No Color) | 88.8 | p. 26 |
| Governor Link Length (White) | 88.6 | p. 26 |
| Governor Link Length (Red) | 89.0 | p. 26 |
| Key Size (Camshaft) | 4x12 | p. 13 |
