All 35 pages of this Yanmar 3TN66L-(E)UB Parts Catalog (OEM #Y00B4522) cover one engine in two variants, the 3TN66L-(E)UB and 3TN66L-EUB, breaking every assembly down to individually numbered components. Inside, you get exploded views and itemized parts lists spanning 15 systems: cylinder block, crankshaft, fuel injection device, governor, starting motor, generator, and more. Open to any section and you'll find exact OEM part numbers alongside cross-references, so you can order the right piece without second-guessing fitment. The governor link length is specified at 88.8mm for the no-color variant, and the oil pressure switch setting is called out at 0.5 KG for positive component identification. Stop ordering parts that don't match. Bookmarks drop you straight to any system by section; search by keyword and pull the number you need in seconds.
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 |
| Spring Pin Size (Gear Housing) | 4x10 | p. 4 |
| Spring Pin Size (Cylinder Head) | 6x12 | p. 8 |
| Key Size (Camshaft) | 4x12 | p. 13 |
| Parallel Pin Size (Crankshaft) | 8x16 | p. 15 |
Yanmar 3TN66L-(E)UB Common Problems This Manual Covers
Yanmar 3TN66L lub oil filter, dipstick, and oil pressure switch part numbers needed for scheduled maintenance p. 17
Check the Lub. Oil System parts list on page 17. The section lists Filter, Dipstick, Guide, Pump Assy, and Valve Assy, Oil Press as separate line items. The oil pressure switch is rated at 0.5KG; order the matching switch part number. Confirm your serial number on page 1 before placing the order.
Manual Section: Lub.Oil SystemGovernor weight assembly and link part numbers unclear, wrong color-coded link ordered for replacement p. 26
Open the Governor parts diagram on page 26. Links come in three lengths by color code: no-color at 88.8, white at 88.6, red at 89.0. Locate your existing link's color marking before ordering. The section also covers Weight Assy, Sleeve, Driving Set, Case Assy, Shaft, and Lever; order these together if doing a complete governor service.
Manual Section: GovernorCylinder head bonnet, exhaust valve, and guide part numbers unclear for top-end component replacement p. 8
Open the Cylinder Head & Bonnet parts diagram on pages 8-10. Individual entries list Bonnet Assy, Head Assy, Suction Valve, Exhaust Valve, and Guide separately. The section includes a 6x12 spring pin entry; add that part number to your order if replacing the head assembly. For a complete seal and gasket kit, cross-reference page 33.
Manual Section: Cylinder Head & BonnetPiston ring set, connecting rod bearing, and crankshaft part numbers needed for bottom-end overhaul p. 15
Locate the Crankshaft & Piston parts list on page 15. The section covers Crankshaft Assy, Flywheel Assy, Piston with Ring, Piston Pin, Rod Assy Connecting, and Bearing as separate entries. The crankshaft uses an 8x16 parallel pin; confirm that part number is included in your order. For a complete overhaul, add the gasket set from pages 33-35.
Manual Section: Crankshaft & PistonCamshaft assembly, tappet, and push rod part numbers needed for valve train component identification p. 13
Check the Camshaft & Driving Gear parts diagram on page 13. Entries include Camshaft Assy, Gear Camshaft, Tappet, Rod Push, Cam Assy, and F.I. Pump Assy as individual line items. The camshaft uses a 4x12 key; note that part number when ordering a replacement shaft to ensure the key is included or ordered separately.
Manual Section: Camshaft & Driving GearFrequently Asked Questions
What are the replacement specifications for fuel filters?
The replacement specification for the fuel filter element is part number 124550-55700. This element is identified as item 10 in the Fuel Pipe section of the manual.
What are the replacement specifications for oil filters?
The replacement specifications for the oil filter include part number 119660-35150, listed as item 15, and part number 119305-35150, listed as item 16A. These filters are found in the Lub.Oil System section.
How do you fix yanmar 3TN66L lub oil filter, dipstick, and oil pressure switch part numbers needed for scheduled maintenance?
Check the Lub. Oil System parts list on page 17. The section lists Filter, Dipstick, Guide, Pump Assy, and Valve Assy, Oil Press as separate line items. The oil pressure switch is rated at 0.5KG; order the matching switch part number. Confirm your serial number on page 1 before placing the order.
How do you fix governor weight assembly and link part numbers unclear, wrong color-coded link ordered for replacement?
Open the Governor parts diagram on page 26. Links come in three lengths by color code: no-color at 88.8, white at 88.6, red at 89.0. Locate your existing link's color marking before ordering. The section also covers Weight Assy, Sleeve, Driving Set, Case Assy, Shaft, and Lever; order these together if doing a complete governor service.
What format is this Yanmar 3TN66L-(E)UB, 3TN66L-(E) UB, 3TN66L-EUB?
A 35-page Parts Catalog in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Can I print specific sections of this Yanmar 3TN66L-(E)UB, 3TN66L-(E) UB?
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 accurate OCR layer, which means you can search and copy text from all pages. The text quality is consistently crisp and easy to read, appearing sharp without any blurriness or fading. Diagrams and illustrations are clear scanned images, not vector, but all labels and part numbers are perfectly readable even when zoomed in. The pages are clean, free of scan artifacts, stains, or skewed content, ensuring a professional presentation with no blank or filler pages.
Reviews
There are no reviews yet.