Part of the Yanmar Parts Manuals.
Guess at a main bearing shell or an O-ring size mid-rebuild and you find out the expensive way when the parts arrive wrong. This PDF is Yanmar's own parts catalog, publication number Y00B6190, for the 4TNE84T-BS industrial diesel, including the 4TNE84T-BS (B50W-1) specification, and it exists so nothing on your order sheet is a guess.
Across 40 pages and 20 bookmarked sections it breaks the engine into exploded views with factory part numbers: Cylinder Block, Crankshaft & Piston, Cylinder Head & Bonnet, Turbocharger, Fuel Injection Pump, Governor, Cooling Water System and Lub. Oil System, right through the Starting Motor and Generator down to brushes and diode assemblies.
With the engine stripped on a stand, you match each piece that came out, bearings, thrust metals (a 0.25 oversize is listed), head gasket, seals, against the factory listing and order the right number the first time.
What's Inside This Yanmar 4TNE84T-BS (B50W-1) Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Information | 1-2 | - |
| Cylinder Block | 3-4 | Gear Housing Flange, Gear Case Assy, Oil Seal, Lub. Oil Supply Cap, Hydraulic Oil Pump Cover, Gasket, Knock Pipe, Retainer |
| Gear Housing | 5-6 | Flywheel Housing, Flywheel Cover Cap, Lub. Oil Sump Assy, Oil Sump, Knock Pipe, Oil Seal Case Assy, Oil Seal |
| Flywheel Housing & Lub. Oil Sump | 7-8 | Bonnet Assy, Breather Cover, Shelter Plate, Breather Baffle, Bonnet Gasket, Lub. Oil Supply Cap, Pipe 16X, Knob |
| Cylinder Head & Bonnet | 9-10 | Intake Manifold, Gasket, Air Heater, Air Cleaner Hose, Air Cleaner Assy, Mark, Cover Assy, Unloader Valve |
| Suc. Manifold & Air Cleaner | 11-12 | Exhaust Manifold Gasket, Exhaust Manifold, Silencer, Silencer Support |
| Exhaust Manifold & Silencer | 13-14 | Tappet, Push Rod, Camshaft Assy, Thrust Metal, Camshaft Gear, Idle Gear Shaft, Gear w/ Bush, Idle Gear Bush |
| Camshaft & Driving Gear | 15-16 | Turbo Charger, Heat Protector, Hose, Turbine Rotor Set, Blower Housing Set, Turbine Housing Set, Bearing Housing Set, Control Assy |
| Turbocharger | 17-18 | Crankshaft Assy, Crankshaft Gear, Crankshaft V-pulley, Flywheel Assy, Ring Gear, Piston w/ Ring, Piston Ring Set, Connecting Rod Assy |
| Crankshaft & Piston | 19-20 | Lub. Oil Pump Assy, Lub. Oil Pump Gasket, Lub. Oil Cooler, Dipstick Guide, Lub. Oil Dipstick, Gasket, Oil Inlet Pipe, Bracket Assy |
| Lub. Oil System | 21-22 | Oil Pressure Switch, Lo Pipe Assy, Retainer, Round Gasket, Elbow, Lub. Oil Return Pipe, Rubber Joint |
| Lub. Oil Pipe | 23-24 | Cooling Water Pump Assy, Cooling Water Pump Gasket, Elbow Pt, V-belt, V-pulley, Cooling Fan, Spacer, Thermostat Cover |
| Cooling Water System | 25-26 | F.i.inject Pump Assy, Camshaft, Thrust Ball Bearing, Cam Shaft Support, Plunger w/ Barrel, Retainer A, Plunger Spring Shoe, Plunger Spring |
| Fuel Injection Pump | 27-28 | Fuel Injection Valve Assy, Fuel Injection Nozzle Assy, Nozzle Holder Assy, Nozzle Spring, Nozzle Spring Seat, Stop Plate, Injection Pipe Retainer, Fuel Injection Pipe |
| Fuel Injection Pipe | 29-30 | Pipe Joint, Fuel Oil Pipe Assy, Fuel Pipe, Fuel Return Pipe, Joint, Cap, Check Valve Assy, Round Gasket |
| Fuel Pipe | 31-32 | Packing, Cover, Link, Governor Weight Assy, Sleeve, Control Shaft Assy, Shaft Spacer, Spacer Assy |
| Governor | 33-34 | Starting Motor, Armature Assy, Thrust Washer Kit, Pinion Stopper Kit, Field Coil Assy, Brush, Rear Cover Assy, Holder |
| Starting Motor | 35-36 | Generator, Rotor Assy, Starter Assy, Rear Cover Assy, Regulator Brush Assy, Brush Assy, Fan Side Guide, Diode Assy |
| Generator | 37-38 | Flex Horn, Liquid, Gasket |
| Tool | 39-40 | - |
Every system also includes assembly.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Plug size | PT1/4 | p. 2 |
| O-ring size | 1A P-16.0 | p. 4 |
| Clamp size | 70 | p. 10 |
| Key size | 7x14 | p. 14 |
| Circlip size | 26 | p. 18 |
| V-belt type | A-36 | p. 24 |
| Cooling fan diameter | 370mm | p. 24 |
Yanmar 4TNE84T-BS (B50W-1) Common Problems This Manual Covers
Hard starting after sitting overnight
Fuel drain-back and contamination are the usual suspects when a 4TNE84T-BS cranks clean but will not light off cold. The Fuel Pipe section lists the fuel strainer assembly, return lines, clamps and gaskets by part number so you can renew the whole supply path instead of chasing one leak at a time.
Manual Section: Fuel Pipe p. 31White smoke and rough combustion
Contaminated or worn injector nozzles show up as white smoke, poor starting and uneven running. The Fuel Injection Pump section itemizes the nozzle assembly, nozzle case, holder assembly, nozzle spring and injection pipes, so a full set of injector parts can be ordered in one pass.
Manual Section: Fuel Injection Pump p. 27Low oil pressure after oil neglect
Old or contaminated oil is a common route to bearing damage on these engines, and by the time pressure drops the pump and cooler deserve scrutiny too. The Lub. Oil System section identifies the oil pump, oil cooler and their O-rings by factory number.
Manual Section: Lub. Oil System p. 21Overheating and coolant loss
Coolant leaks and creeping temperature are recurring complaints on Yanmar diesels, and a tired water pump usually announces itself with seepage first. The Cooling Water System section identifies the cooling components by part number so replacements match what the factory fitted.
Manual Section: Cooling Water System p. 25Turbocharger wear on high-hour engines
Shaft play or oil carryover on the turbo means rotor and housing parts, not guesswork. The Turbocharger section lists the rotor set, turbine and blower housing sets so a rebuild or replacement is ordered against the correct assemblies.
Manual Section: Turbocharger p. 17Starter drags or fails to engage
Engines that only start with ether often turn out to have a tired starter compounding a fuel issue. The Starting Motor section breaks the starter into armature assembly, field coil assembly, brushes and brush holder so worn internals can be replaced individually.
Manual Section: Starting Motor p. 35Charging system stops keeping up
A battery that will not hold charge points at the generator, and these fail in stages: brushes, regulator, diodes. The Generator section lists the rotor assembly, brush assemblies, regulator, diode assembly and condenser by part number.
Manual Section: Generator p. 37Frequently Asked Questions
Which engine does this parts catalog cover?
It covers the Yanmar 4TNE84T-BS industrial vertical multi-cylinder diesel, including the 4TNE84T-BS (B50W-1) specification. It is Yanmar publication Y00B6190, and the opening Information section carries the part and engine specification data used to confirm your unit. p. 1
Does it include torque specs or repair procedures?
No. This is a parts catalog, not a service manual: exploded views and factory part numbers across 20 sections from Cylinder Block through Tool. For head bolt torque sequences, valve lash or injection timing procedures you would pair it with the engine's service manual.
Can I find fuel injector and injection pump part numbers?
Yes. The Fuel Injection Pump section lists the nozzle assembly, nozzle case, holder assembly, seat, nozzle spring and injection pipe, and the adjacent Fuel Injection Pipe and Fuel Pipe sections cover the lines, strainer and return fittings. p. 27
What exactly do I receive with this Yanmar 4TNE84T-BS Parts Catalog?
You get a 40-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Can I print a copy of this Yanmar 4TNE84T-BS Parts Catalog for the shop?
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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