Part of the Yanmar Parts Manuals.
Three rod bearings on the bench and no certainty which undersize you are holding is a bad spot to be in mid-rebuild. Yanmar publication Y00B3752 is the factory parts catalog for the 3TN84L diesel, covering the 3TN84L-RBS, 3TN84L-RBSVM and 3TN84L-RBFVM builds along with the YB271/B and YB listings, and its job is to put a factory part number on every piece you pull off this engine.
Across 49 pages and 14 sections it covers the complete engine, from cylinder block and head through crankshaft, pistons and connecting rods to the lubrication and cooling water systems and thermostat. Every exploded drawing keys each part, gasket, O-ring and oil seal to the number Yanmar assigned it.
You buy it once and it stays yours, a 0.7 MB PDF that opens anywhere and prints cleanly. Keep it beside the engine while it is apart, and order every shell, ring set and seal by its factory number, not a parts counter guess.
What's Inside This Yanmar Yanmar 3TN84L-RBS Series Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Cylinder Block | 3-4 | Gear Housing Assy, Oil Seal, Lub. Oil Supply Cap, Gears Housing Flange, Gear Housing Flange, Hydraulic Oil Pump Cover, Hydraulic Oil Pump Gasket, Gasket |
| Gear Housing | 5-6 | Flywheel Housing, Flywheel Cover Cap, Oil Seal Case Assy, Oil Seal, Oil Seal Case Gasket |
| Flywheel Housing | 7-8 | Lub. Oil Sump Assy, Oil Pan Assy, Oil Pan Cover, Plug |
| Lub. Oil Sump | 9-10 | Bonnet Assy, Lub. Oil Supply Cap, Bonnet Gasket, Breather Cover, Shelter Plate, Breather Baffle, Breather Pipe, Retainer |
| Bonnet | 11-12 | Cylinder Head Assy, Intake Valve, Exhaust Valve, Valve Spring, Spring Retainer, Valve Stem Seal, Valve Cap, Rocker Shaft Assy |
| Cylinder Head | 13-14 | Suction Manifold, Suction Manifold Gasket, Gasket, Silencer Gasket, Silencer, Silencer Stay, Exhaust Manifold, Exhaust Manifold Gasket |
| Suction & Exhaust Manifold | 15-16 | Camshaft Assy, Thrust Bearing, Camshaft Gear, Tappet, Push Rod, Idle Gear Shaft, Gear w/ Bush, Idle Gear Bush |
| Camshaft & Driving Gear | 17-18 | Crankshaft Assy, Crankshaft Gear, Crankshaft V-pulley, Flywheel w/ Ring Gear, Ring Gear |
| Crankshaft & Flywheel | 19-20 | Piston w/ Ring, Ring Set, Piston Ring Set, Connecting Rod Assy, Crankpin Bearing, Piston Pin Bush |
| Piston & Connecting Rod | 21-22 | Lub. Oil Pump Assy, Lub. Oil Pump Gasket, Lub. Oil Dipstick, Dipstick, Dipstick Guide, Gasket, Oil Inlet Pipe Assy, Strainer Bracket |
| Lub. Oil System | 23-24 | Oil Pressure Switch, Lub. Oil Pipe Assy, Round Gasket, Bolt |
| Lub. Oil Line | 25-26 | Cooling Water Pump Assy, Cooling Water Pump Gasket, V-belt, V-pulley, Cooling Fan, Spacer |
| Cooling Water System | 27-28 | Thermostat Cover, Upper Gasket, Gasket, Thermostat Case Assy, Joint PT1, Cover Gasket, Thermost.case Cover, Thermostat |
| Thermostat | 29-49 | Joint PT1, Cooling Water Pipe, Gasket, Thermo Switch, Fuel Injection Pump Pump Assy, Camshaft, Thrust Ball Bearing, Bearing Retainer |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| V-Belt Size | A-38 | p. 26 |
Yanmar Yanmar 3TN84L-RBS Series Common Problems This Manual Covers
Overheating from water pump or V-belt wear
Water pump seals and bearings wear out on these small diesels, and a glazed or cracked V-belt lets the temperature climb long before the pump actually fails. The Cooling Water System section shows the pump assembly, gasket, cooling fan, V-pulley and V-belt by part number so you can renew the whole drive in one order.
Manual Section: Cooling Water System p. 27Thermostat stuck open or closed
A thermostat stuck partly open never lets the engine reach working temperature, and one stuck closed will cook it. The Thermostat section lists the cover, upper case assembly, thermostat case, joint and every gasket in between.
Manual Section: Thermostat p. 29Low oil pressure at warm idle
Low pressure on a warm idle often traces back to a worn lube oil pump rather than the gauge or sender. The Lub. Oil System section carries the oil pump assembly, its gasket, the dipstick and the oil inlet pipe assembly.
Manual Section: Lub. Oil System p. 23Oil leak at the pressure switch
A film of oil around the pressure switch or its pipe joints is a common leak point that mimics worse problems. The Lub. Oil Line section lists the oil pressure switch, pipe joint bolts, lube oil pipe assembly and gaskets.
Manual Section: Lub. Oil Line p. 25Rear crankshaft seal leaking into flywheel housing
Oil slung around the inside of the flywheel housing usually means the rear seal has hardened. The Flywheel Housing section shows the oil seal, oil seal case assembly and its gasket, a cheap fix while the flywheel is already off.
Manual Section: Flywheel Housing p. 7Front oil leak behind the crank pulley
Oil seeping from behind the V-pulley points to the gear housing oil seal or a flattened gasket. The Gear Housing section keys the oil seal, cover, gaskets and O-rings so you can reseal the front of the engine in one pass.
Manual Section: Gear Housing p. 5Blow-by and oil burning from worn rings
Blow-by at the breather and rising oil consumption point to worn rings or tired bores. The Piston & Connecting Rod section lists pistons with rings, ring sets, piston pins, connecting rod assemblies and rod bearings for the rebuild order.
Manual Section: Piston & Connecting Rod p. 21Frequently Asked Questions
Which Yanmar engines does this parts catalog cover?
It is Yanmar factory parts catalog Y00B3752 for the 3TN84L diesel, covering the 3TN84L-RBS, 3TN84L-RBSVM and 3TN84L-RBFVM versions plus the YB271/B and YB listings. If your engine plate shows one of these codes, this is the matching parts book.
Is this a service manual with torque specs and clearances?
No. It is the factory parts catalog: exploded drawings with Yanmar part numbers across 14 sections, from Cylinder Block to Thermostat. It identifies and orders parts; it does not give torque sequences or clearances. Pair it with a service manual for those, because a guessed head torque figure is how a fresh gasket fails.
Does it list the rebuild parts, like rings and bearings?
Yes. The Piston & Connecting Rod section lists pistons with rings, ring sets, piston pins, connecting rod assemblies and rod bearings, and the Cylinder Block section carries main bearings, thrust bearings and the head gasket, so a bottom-end parts order comes straight off these pages. p. 21
Can I identify cooling system parts from it?
The Cooling Water System section covers the cooling water pump assembly, gasket, cooling fan, V-pulley and V-belt (A-38 and A-36 belt sizes appear in the listings), and the Thermostat section handles the thermostat case, covers and gaskets. p. 27
What do I get after purchasing this 3TN84L-RBS & variants manual?
Immediate download of the complete 49-page searchable Parts Catalog. Access it on any device, from a laptop at your desk to a phone in the field.
Can I print specific sections of this 3TN84L-RBS & variants 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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