Need the factory part numbers for your Yanmar 3TN66L-EUBA engine? This 33-page parts catalog (OEM #Y00B6331) covers every assembly on the 3TN66L-EUBA, from cylinder block and crankshaft to fuel injection device and governor. Inside, you get fully exploded views with individual part numbers for 15 major systems: cylinder head with suction and exhaust valves, camshaft and driving gear, crankpin bearings, the lube oil pump assembly, cooling water pump, glow plugs, and the starting motor and generator. Every component is cross-referenced by part number so you can order exactly what you need without guessing at descriptions. Your thermostat opens at 71°C, piston and ring oversizes run 0.25, thrust bearing undersizes at 0.25US, real data points that confirm this is genuine Yanmar factory documentation, not a third-party reprint. Stop ordering the wrong part. Bookmarked by system, searchable by keyword: pull up the section you need before you even walk to the engine.
What's Inside This Yanmar 3TN66L-EUBA Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 3-4 | Main Bearing, Thrust Bearing, Cylinder Head Stud, Drain Plug, Gasket |
| Gear Housing | 5-6 | Gear Case Cover, Oil Seal, Knock Pipe, Gasket, O-Ring |
| Flywheel Housing & Lub. Oil Sump | 7-8 | Flywheel Housing, Flywheel Cover, Oil Seal, Oil Sump, Oil Pan, Drain Plug |
| Cylinder Head & Bonnet | 9-10 | Cylinder Head, Suction Valve, Exhaust Valve, Valve Spring, Valve Stem Seal, Rocker Arm, Bonnet, Glow Plug |
| Suc. Manifold & Air Cleaner | 11-12 | Intake Manifold, Manifold Gasket, Air Hose, Air Cleaner, Air Cleaner Element, Air Cleaner Cover |
| Exh. Manifold | 13-14 | Exhaust Manifold, Manifold Gasket, Bolt, Stud, Nut |
| Camshaft & Driving Gear | 15-16 | Camshaft, Camshaft Gear, Thrust Bearing, Push Rod, Tappet, Fuel Cam Bearing, Idle Gear |
| Crankshaft & Piston | 17-18 | Crankshaft, Flywheel, Ring Gear, Piston, Piston Ring, Connecting Rod, Crankpin Bearing |
| Lub. Oil System | 19-20 | Pump Assy, Lub. Oil, Gasket, L.O.PUMP, Dipstick, Filter, Valve Assy |
| Cooling Water System | 21-22 | Pump Assy, C. Water, Gasket, C.W., V-Pulley, C.W. Pump, Fan, Cooling |
| Fuel Injection Device | 23-25 | Pump Assy, F.INJECT., Plunger W/BARREL, Nozzle Assy, F.INJECT, Rack, Pinion, Pipe (1) |
| Governor | 26-27 | Weight Assy, Gov., Lever Assy, Shaft Assy, Regulator, Handle, Engine Stop Device |
| Starting Motor | 28-29 | Starter, Switch, Magnetic, Pinion Assy, Armature, (Non-Asb.), Housing, Gear |
| Generator | 30-31 | Stator, Bearing 6201ZZC3, Flywheel, Pulley, Shaft |
| 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 |
Yanmar 3TN66L-EUBA Common Problems This Manual Covers
Yanmar 3TN66L-EUBA fuel injection nozzle assembly part number unclear, unsure which nozzle fits engine serial range p. 23
Open the Fuel Injection Device exploded view on page 23. Locate the Nozzle Assy entry and record its part number. Confirm the injection pump O-ring before ordering: the S-type O-ring listed on page 24 measures 7.0. Cross-reference the Gasket Set on page 32 to check whether nozzle gaskets are included in the optional kit or ordered separately.
Manual Section: Fuel Injection DeviceCooling water pump assembly part number needed, also unsure which thermostat to order with it p. 21
Check the Cooling Water System section starting on page 21. Locate the Pump Assy C.W. entry and the thermostat part number in the exploded parts list. The thermostat listed on page 20 opens at 71°C. Verify this rating matches your application before ordering to avoid receiving an incompatible replacement.
Manual Section: Cooling Water SystemLube oil filter part number unknown, need oil pump assembly and dipstick parts for scheduled service p. 19
Reference the Lub. Oil System section on page 19. Identify the Filter entry and L.O. Pump Assy part numbers in the exploded view. Also note the Valve Assy part number listed there, which covers the oil pressure switch rated at 0.5KG (page 18), so you can confirm that part number before placing a complete service kit order.
Manual Section: Lub. Oil SystemPiston ring set part number needed, unclear whether standard or oversize rings fit after bore measurement p. 17
Turn to the Crankshaft and Piston section on page 17. Find the Piston Ring entry in the exploded parts list and note the part numbers for both standard and oversize versions. The catalog lists 0.25 oversize for the piston-with-ring set and ring set separately (page 16). Order the correct oversize code to match your measured bore before placing the order.
Manual Section: Crankshaft & PistonMain bearing and thrust bearing part numbers unclear, need correct undersize code for crankshaft journal clearance p. 3
Locate the Cylinder Block section starting on page 3. The Main Bearing and Thrust Bearing entries are in the exploded parts list there. Standard undersize for thrust bearings is 0.25US (page 2). Also verify the drain plug O-ring part number while you are in this section: the P-type O-ring listed on page 4 measures 12.0.
Manual Section: Cylinder BlockFrequently Asked Questions
What are the replacement specifications for oil filter?
The manual identifies the LUB. OIL FILTER with part number 119305-35150. This component is depicted as item 18 within the Lub. Oil System diagram on page 19, providing a specific part for replacement.
How do you fix yanmar 3TN66L-EUBA fuel injection nozzle assembly part number unclear, unsure which nozzle fits engine serial range?
Open the Fuel Injection Device exploded view on page 23. Locate the Nozzle Assy entry and record its part number. Confirm the injection pump O-ring before ordering: the S-type O-ring listed on page 24 measures 7.0. Cross-reference the Gasket Set on page 32 to check whether nozzle gaskets are included in the optional kit or ordered separately.
How do you fix cooling water pump assembly part number needed, also unsure which thermostat to order with it?
Check the Cooling Water System section starting on page 21. Locate the Pump Assy C.W. entry and the thermostat part number in the exploded parts list. The thermostat listed on page 20 opens at 71°C. Verify this rating matches your application before ordering to avoid receiving an incompatible replacement.
How do you fix lube oil filter part number unknown, need oil pump assembly and dipstick parts for scheduled service?
Reference the Lub. Oil System section on page 19. Identify the Filter entry and L.O. Pump Assy part numbers in the exploded view. Also note the Valve Assy part number listed there, which covers the oil pressure switch rated at 0.5KG (page 18), so you can confirm that part number before placing a complete service kit order.
What format is this manual in?
You get a 33-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Is this Yanmar 3TN66L-EUBA Parts Catalog printable?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Document Quality
This document is a scanned PDF with an added OCR layer, allowing you to search and copy text from the parts lists. The OCR text is crisp and easy to read throughout. All diagrams and illustrations are clear, high-resolution raster images, with sharp lines and easily readable labels. The pages are clean, free of scan artifacts, stains, or skewed content, and there are no notable blank pages.
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