Part of the Yanmar Parts Manuals.
An engine on a stand with the crank out is a bad time to guess at bearing part numbers, and a Yanmar 4TN100L-RB is not an engine to order for from memory. This parts catalog, Yanmar publication Y00B4661, covers the 4TN100L-RB and the 4TN100L-RB (B7) build, and it exists so the numbers you read off the exploded views match what arrives in the box.
Forty-three pages walk the engine from cylinder block to governor: main and thrust bearings, gaskets and O-rings for the gear housing, the full lubrication and cooling water systems, piston and connecting rod assemblies, the fuel injection pump down to plunger, delivery valve and rack, and every link and spring inside the governor case.
It downloads as a PDF, so print the pages for the systems you have apart and let them get oily at the bench; the file stays clean on your drive.
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
Low oil pressure from worn main bearings
Once you have measured the journals and found them under limit, the Cylinder Block section lists the main bearing sets, including a 0.25 undersize, along with the thrust bearings, piston jets, and cylinder head bolts worth putting on the same order.
Manual Section: Cylinder Block p. 2Crankshaft oil seal leaking at the flywheel
A wet flywheel housing usually traces back to the rear crankshaft seal. The Oil Seal Housing section identifies the seal case, the 95x115x10 mm seal itself, and the bolts, so you replace the whole interface instead of reusing a tired case.
Manual Section: Oil Seal Housing p. 6Overheating or running cold
An engine that creeps hot under load, or never reaches temperature, points at the thermostat or water pump. The Cooling Water System section lists the water pump assembly, the 71 °C thermostat, its cover, the thermo switch, and the gaskets and O-rings for the job.
Manual Section: Cooling Water System p. 22Blue smoke and rising oil consumption
Oil burning on a worn 4TN100L-RB comes down to rings, piston pin bushes, or crankpin bearings letting oil past. The Piston & Connecting Rod section carries part numbers for pistons with rings, ring sets, piston pins, connecting rod assemblies, and crankpin bearings.
Manual Section: Piston & Connecting Rod p. 20Hard starting and uneven running
When bleeding the fuel system does not cure rough running, the injection pump internals are next. The Fuel Injection Pump section breaks the pump down to its camshaft, plunger with barrel, tappet assemblies, delivery valve with seat, and rack.
Manual Section: Fuel Injection Pump p. 26Hunting and surging at idle
Tired governor springs and worn linkages make the engine hunt as the weights and levers chase each other. The Governor section, the largest in the catalog, itemizes the governor case, weight assembly, control and governor levers, links, and springs, plus the 12 V fuel stop motor.
Manual Section: Governor p. 28Oil leaks at the sump and filter
Seepage from the sump joint or filter mount is cheap to fix if you order every sealing part at once. The Lub.Oil System section covers the oil sump, oil pump, filter, drain plug, level gauge, and oil pipes.
Manual Section: Lub.Oil System p. 8Frequently Asked Questions
Which Yanmar engines does this parts catalog cover?
It covers the Yanmar 4TN100L-RB diesel engine, including the 4TN100L-RB (B7) build, under Yanmar publication number Y00B4661. Part numbers come from the engine model itself, so it applies wherever your 4TN100L-RB happens to be installed.
Does it include torque specs and rebuild procedures?
No. This is a parts catalog: 43 pages of exploded views and part numbers organized by system, from the Cylinder Block through the Governor. Use it to identify and order the right parts; torque sequences and rebuild procedures belong in a separate service manual.
Are undersize bearings listed for a reground crankshaft?
Yes. The Cylinder Block section lists main bearings including a 0.25 undersize, and the Piston & Connecting Rod section carries the crankpin bearings, so you can order shells to match your regrind before the block goes back together. p. 2
Does it cover the cooling water system?
Yes. The Cooling Water System section lists the water pump assembly, the thermostat with its 71 °C opening temperature, the thermostat cover, the thermo switch, and the gaskets and O-rings you need for reassembly. p. 22
Is this Yanmar 4TN100L-RB manual a download or a disc?
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.
Does this Yanmar 4TN100L-RB manual allow printing?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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