All 43 pages of this Yanmar 4TN100L-RB Parts Catalog (OEM #Y00B4661) are built around one job: identifying and ordering the exact components your 4TN100L-RB engine needs, covering both the standard and B7 variants. You get exploded assembly views across 14 systems, from the Cylinder Block and Crankshaft & Flywheel down through the Fuel Injection Pump and Governor, each paired with itemized part number lists so you can cross-reference components without second-guessing yourself. Inside: Piston & Connecting Rod assemblies, Camshaft & Driving Gear breakdowns, Cooling Water System components, and Oil Cooler Case sub-assemblies, all called out with factory part numbers. When you're sourcing an oil seal (95x115x10 mm) or specifying a 0.25 U.S. main bearing undersize, you need the right number on the first call. Order the wrong part and you're waiting on a shipment. Bookmarked by system, so you jump straight to Lub.Oil or Governor without scrolling; pull it up on any device and get to the right page in seconds.
What's Inside This Yanmar 4TN100L-RB (B7) 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 |
Yanmar 4TN100L-RB (B7) Common Problems This Manual Covers
Yanmar 4TN100L-RB cooling water pump and thermostat part numbers needed, engine overheating p. 22
Open the Cooling Water System diagram on page 22. The pump assembly, gasket, O-ring, thermostat, thermostat cover, and thermo switch all carry individual part numbers there. The thermostat is rated at 71°C; confirm the replacement matches this spec before ordering. Note the O-ring size from the parts list before buying a generic seal.
Manual Section: Cooling Water SystemOil seal housing part number for crankshaft front seal leak, oil dripping at base p. 6
Check the Oil Seal Housing diagram on page 6. The oil seal listed measures 95x115x10 mm; match this dimension to the seal you pulled before ordering. The oil seal case and bolts are also itemized separately on the same page if the housing itself needs replacement.
Manual Section: Oil Seal HousingGovernor fuel stop motor and control lever part numbers, engine won't shut down p. 28
Open the Governor section starting on page 28. The fuel stop motor, weight assembly, control lever assembly, governor lever, and spring are each listed with part numbers. The fuel stop motor is rated at 12 V; verify your system voltage matches before ordering the replacement motor or solenoid.
Manual Section: GovernorPiston ring set and connecting rod bearing part numbers for blue smoke oil consumption p. 20
Find the Piston & Connecting Rod exploded view on page 20. Piston with rings, ring set, piston pin, rod assembly, crankpin bearing, and piston pin bush are all listed individually. The thrust bearing oversize is cataloged at 0.25OS; confirm whether your crankshaft is standard or has been reground before ordering bearing shells.
Manual Section: Piston & Connecting RodMain bearing and thrust bearing part numbers needed for crankshaft bottom-end knock p. 2
Check the Cylinder Block parts list on page 2. Main bearing, camshaft bush, and thrust bearing are all listed with part numbers. The main bearing undersize is offered at 0.25U.S; check the crankshaft journal diameter before ordering to determine whether standard or undersize bearings are required. The crankshaft assembly is detailed on page 18.
Manual Section: Cylinder BlockFrequently Asked Questions
What are the replacement specifications for fuel filters?
The manual identifies the fuel filter as part number 119000-55600, with a quantity of 1. However, it does not provide any replacement specifications such as recommended intervals or detailed procedures for replacement.
How do you fix yanmar 4TN100L-RB cooling water pump and thermostat part numbers needed, engine overheating?
Open the Cooling Water System diagram on page 22. The pump assembly, gasket, O-ring, thermostat, thermostat cover, and thermo switch all carry individual part numbers there. The thermostat is rated at 71°C; confirm the replacement matches this spec before ordering. Note the O-ring size from the parts list before buying a generic seal.
How do you fix oil seal housing part number for crankshaft front seal leak, oil dripping at base?
Check the Oil Seal Housing diagram on page 6. The oil seal listed measures 95x115x10 mm; match this dimension to the seal you pulled before ordering. The oil seal case and bolts are also itemized separately on the same page if the housing itself needs replacement.
How do you fix governor fuel stop motor and control lever part numbers, engine won't shut down?
Open the Governor section starting on page 28. The fuel stop motor, weight assembly, control lever assembly, governor lever, and spring are each listed with part numbers. The fuel stop motor is rated at 12 V; verify your system voltage matches before ordering the replacement motor or solenoid.
Is this Yanmar 4TN100L-RB, 4TN100L-RB (B7) Parts Catalog a digital download?
Instant PDF download. You get the full 43-page searchable Parts Catalog immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Are there any print restrictions on this Yanmar 4TN100L-RB, 4TN100L-RB (B7)?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Document Quality
This document is a high-quality scanned PDF with an accurate OCR text layer, allowing you to search and copy text throughout. Both the textual content and the exploded diagrams are crisp and easy to read. Diagrams are clear raster images with readable labels, and there are no blurry or pixelated illustrations. The pages are clean, free from scan artifacts, stains, or skewed content, presenting a consistent and professional appearance.
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