Part of the Yanmar Parts Manuals.
With the main caps pulled and a worn crankshaft on the stand, the next question is which undersize bearing Yanmar actually supplies for this block. Publication Y00B5891, Yanmar's factory parts catalog for the 3TNE82A-B1 diesel engine (B27-2B specification), answers it in the listings: 0.25 undersize main and crankpin bearings, 0.25 oversize pistons and ring sets, each tied to the correct factory part number.
The 36-page PDF breaks the engine into 17 sections, from Cylinder Block and Crankshaft & Piston through the Fuel Injection Pump, Governor, Cooling Water System, Starting Motor, and the optional gasket set. When you are alone with a stripped engine and no parts counter to call, this is how you identify every plug, bush, seal, and gasket before you order.
It downloads instantly, prints cleanly, and lives on whatever device sits next to the stand, so the listings are with the engine, not back at the desk.
What's Inside This Yanmar 3TNE82A-B1, B27-2B Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 2-3 | Cylinder Block Assy, Main Bearing, Thrust Bearing, Camshaft Bush, Head Gasket |
| Gear Housing | 4-5 | Gear Housing Assy, Oil Seal, Lub. Oil Supply Cap, Gears Housing Flange, Hydraulic Oil Pump Cover, Gasket, Knock Pipe, Blind Cover |
| Flywheel Housing & Oil Sump | 6-7 | Flywheel Housing, Lub. Oil Sump Spacer, Oil Sump Assy, Oil Seal Case Assy, Oil Seal, Flywheel Cover Cap |
| Cylinder Head & Bonnet | 8-9 | Cylinder Head Assy, Valve Guide, Suction Valve, Exhaust Valve, Valve Spring, Spring Retainer, Valve Stem Seal, Valve Cap |
| Suction Manifold & Air Cleaner | 10-11 | Suction Manifold, Gasket, Air Heater, Suction Silencer, Cleaner Support Assy, Support Seat, Band, Rubber Sheet |
| Exhaust Manifold & Silencer | 12-13 | Exhaust Manifold, Exhaust Manifold Gasket, Gasket, Silencer, Silencer Stay |
| Camshaft & Driving Gear | 14-15 | Camshaft Assy, Camshaft Gear, Thrust Metal, Idle Gear Shaft, Gear W/ Bush, Idle Gear Bush, Tappet, Push Rod |
| Crankshaft & Piston | 16-17 | Crankshaft Assy, Crankshaft Gear, Crankshaft V-Pulley, Flywheel W/ Gear, Ring Gear, Piston Assy, Piston Ring Set, Connecting Rod Assy |
| Lubrication Oil System | 18-19 | Lub. Oil Pump Assy, Lub. Oil Pump Gasket, Lub. Oil Dipstic, Dipstick Guide, Gasket, Oil Inlet Pipe Assy, Strainer Bracket, Filter 80X80L |
| Cooling Water System | 20-21 | Cooling Water Pump, Cooling Water Pump Gasket, V-Belt, V-Pulley, Cooling Fan, Thermostat Cover, Gasket, Thermostat |
| Fuel Injection Pump | 22-23 | Fuel Injection Pump Assy, Camshaft, Thrust Ball Bearing, Cam Shaft Support, Plunger W/ Barrel, Retainer a, Plunger Spring Shoe, Plunger Spring |
| Fuel Injection Pipe | 24-25 | Fuel Injection Valve Assy, Fuel Injection Nozzle Assy, Nozzle Holder Assy, Nozzle Spring, Nozzle Spring Seat, Stop Plate, Injection Pipe Retainer |
| Fuel Pipe | 26-27 | Fuel Strainer Assy, Taper Valve, Taper Valve Spring, Lever, Strainer Cup, Retaining Ring, Spring, Element |
| Governor | 28-29 | Governor Case, Packing, Cover, Link, Governor Weight Assy, Sleeve, Control Shaft Assy, Shaft Spacer |
| Starting Motor | 30-31 | Starter, Armature Assy, Bearing, Field Coil Assy, Brush, Rear Cover, Brush Holder Assy, Brush Spring |
| Generator | 32-33 | Collar, Plate Assy, Stator, Coupler, Flywheel Assy, Adjuster |
| Gasket Set (Optional) & Tool | 34-36 | Gasket Set, Head Gasket, Bonnet Gasket, Exhaust Manifold Gasket, Lub. Oil Pump Gasket, Cooling Water Pump Gasket, Liquid Gasket, Flex Horn |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Bearing Replacement Size | US=0.25 | p. 2 |
| Crankpin Bearing Replacement Size | U.S=0.25 | p. 16 |
| Main Bearing Undersize | 0.25 | p. 2 |
| Thrust Bearing Oversize | 0.25 | p. 2 |
| Camshaft Key Size | 7x14 | p. 14 |
| Crankshaft Key Size | 7x14 | p. 16 |
| Crankpin Bearing Undersize | 0.25 | p. 16 |
| Piston with Ring Oversize | 0.25 | p. 16 |
| Piston Ring Set Oversize | 0.25 | p. 16 |
| V-Belt Type | A-39 | p. 20 |
Yanmar 3TNE82A-B1, B27-2B Common Problems This Manual Covers
Low oil pressure or main bearing knock
Worn or spun main bearings are the usual end of an oil-starved diesel. The Cylinder Block section lists the block assembly, main bearings, and bushes, including the 0.25 undersize main bearing for a reground crankshaft.
Manual Section: Cylinder Block p. 2Rod knock after high hours
Crankpin bearing wear shows up as a knock under load, and bore wear as blowby and oil use. The Crankshaft & Piston section lists 0.25 undersize crankpin bearings plus 0.25 oversize pistons and ring sets for an overbore.
Manual Section: Crankshaft & Piston p. 16Hard starting from fuel delivery faults
A worn plunger and barrel or a sticking rack will leave this engine cranking without firing. The Fuel Injection Pump section identifies the pump assembly, plunger with barrel, delivery valve with seat, rack, and control pinion.
Manual Section: Fuel Injection Pump p. 22Smoke and rough running from injectors
Tired nozzles cause white or black smoke, rough idle, and lost power. The Fuel Injection Pipe section lists the injection valve assemblies, nozzle assemblies, holders, and springs you need to order a matched replacement set.
Manual Section: Fuel Injection Pipe p. 24Overheating and coolant loss
A weeping water pump or a slipping, cracked belt will cook any diesel. The Cooling Water System section covers the pump, fan, covers, and the A-39 V-belt so you can replace the whole drive in one order.
Manual Section: Cooling Water System p. 20Oil leaks at gaskets and seals
Aging engines seep at the head, bonnet, and exhaust manifold joints. The Gasket Set (Optional) & Tool section lists the head gasket, bonnet gasket, exhaust manifold gasket, and O-rings, including the optional full gasket set for a reseal.
Manual Section: Gasket Set (Optional) & Tool p. 34Starter drags or fails to engage
Worn brushes, a tired magnetic switch, or a slipping clutch turn every cold start into a gamble. The Starting Motor section breaks the starter into armature, field coil, brushes, clutch assembly, and switch so you can rebuild instead of replace.
Manual Section: Starting Motor p. 30Frequently Asked Questions
Which engine does this parts catalog cover?
It is Yanmar factory publication Y00B5891, the parts catalog for the 3TNE82A-B1 diesel engine built to the B27-2B specification. It covers the bare engine and its fitted systems, so it applies whether yours sits in a machine, a genset, or on a stand.
Does it list undersize bearings for a reground crankshaft?
Yes. The Cylinder Block section lists 0.25 undersize main bearings, and the Crankshaft & Piston section lists 0.25 undersize crankpin bearings along with 0.25 oversize pistons and piston ring sets, so you can order rebuild parts to match your machining. p. 2
Does it cover the fuel injection pump internals?
Yes. The Fuel Injection Pump section lists the pump assembly down to the plunger with barrel, delivery valve with seat, rack, and control pinion. Injection valves, nozzle assemblies, and holders are in the Fuel Injection Pipe section that follows it. p. 22
Is this a service manual with torque specs and procedures?
No. This is the parts catalog: it identifies every assembly and part number across 17 sections, from cylinder block to generator. It does not contain rebuild procedures, clearances, or torque sequences, so pair it with a service manual when you are setting up the bottom end.
Is this Yanmar 3TNE82A-B1 Parts Catalog a digital download?
A 36-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 this manual?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
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