Part of the Yanmar Parts Manuals.
Every subassembly on the 3TNV84T-XBL gets its own exploded view here: cylinder block, gear housing, cylinder head and bonnet, camshaft and driving gear, crankshaft and piston, fuel injection pump, governor, injection valves, turbine and silencer, cooling water system, starter motor and generator, right down to the gasket set. This is Yanmar's own parts catalog, publication 0CB10-M73401EN, and it also lists the 4JH-DT, 4JH-DTZ, 4JH-DTZA, 4JH-DTZY and 4JH-DTZP.
When the engine is apart on a stand and there is nobody to ask which main bearing assembly or valve stem seal fits, the effective machine number columns and interchangeability symbols settle it against your serial. Prefixes E00185, E/#21868, E/#25364, E/#27323, E/#30635 and E/#32451 are covered.
The whole catalog is a 26 page PDF, about 1.1 MB, delivered as a download the moment you pay. Print the page you are working from, take it to the bench and let it get oily; the file stays clean.
What's Inside This Yanmar 3TNV84T-XBL / 4JH-DT Series Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Reference Materials | 2 | Fuel Injection Pump, Fuel Injection Pump N, Camshaft, Roller Bearing, Retainer |
| Cylinder Block | 4 | Cylinder Block Assy, Camshaft Bush, Camshaft N Bush, Main Bearing Assy, Main Lower N Bearing, Thrust Bearing Assy, Thrust N Bearing Assy, Head Gasket |
| Gear Housing | 5 | Gear Case Assy, Oil Seal, Oil N Seal, Cover Assy, Pump Cover, Relief Valve, Spring, Gear Case Flange |
| Mounting Flange & Oil Sump | 6 | Oil Seal Case Assy, Oil Seal, Oil-Pan Spacer, Mounting Flange, Oil Sump Assy |
| Cylinder Head & Bonnet | 7 | Engine Lifter, Rocker Shaft Assy, Rocker Arm Shaft, Rocker Arm Support, Rocker Spring, Rocker Arm Assy, Valve Cap, Cylinder Head Assy |
| Suction Manifold | 8 | Air Intake Pipe, Air Intake Manifold, Manifold Gasket, Air 11V Heater, Air 11V N Heater, Air Heater Gasket, Air Heater Bend |
| Exhaust Manifold | 9 | Exhaust Manifold Gasket, Bolt |
| Camshaft & Driving Gear | 10 | Tappet, Push-Rod, Camshaft Assy, Thrust Bearing, Camshaft Gear, Idle Shaft, Idle Gear Assy, Idle N Gear Assy |
| Turbine & Silencer | 11 | Gasket, RHB31w/ G Turbine, Silencer, Silencer Bracket, Silencer F Bracket, Pulley Spacer, Spacer S |
| Crankshaft & Piston | 12 | Crankshaft Assy, Crank V-Pulley, Flywheel Assy, Ring Gear, Piston Assy, Piston Ring Set, Ring, Connecting Rod Assy |
| Lub. Oil System | 13 | Oil Dipstick, Dipstick Guide, Gasket, Oil Inlet Pipe Assy, Cooling Nozzle, Filter Bracket Assy, Lo Filter, Hydraulic Switch |
| Lub. Oil Pipe | 14 | Oil Pipe Assy, Rubber Joint, Joint M8 Bolt Assy, 8X1 Gasket |
| Cooling Water System | 15 | Water Pump Assy, Water Pump Gasket, Pump Plate, Joint, Thermostat Gasket, V-Pulley, A38 V-Belt, Cooling D380 Fan |
| Fuel Injection Pump | 16-17 | Injection Pump Assy, Over Flow Joint, Tappet Stopper, Delivery Valve Assy, Delivery Spring, Delivery Holder, Cooling Water Joint, Link Lifter |
| Governor | 18 | Gasket, Governor Case Cover, Governor Case N Cover, Return Spring, Regulator Lever, Shaft Stopper, Stop Solenoid |
| Fuel Injection Valve | 19 | Fuel Injector Assy, F.i Nozzle Assy, Nozzle Spring, Spring Seat, Spacer, Cap, Cap N, Pipe Retainer |
| Fuel Pipe | 20 | Filter Bracket, Filter R Bracket, Fo Filter, D13XL220 Hose Assy, Fuel Hose, Corrugated Tube, Nylon Band |
| Starter Motor | 21 | Starter Assy, Switch Assy, Armature Assy, Field Coil Assy, Brush, Cover, Brush Holder Assy, Brush Spring |
| Generator | 22 | 40A Generator Assy, Rotor Assy, Bearing Cover, Generator Frame Assy, Retainer, Frame Assy, Cover, Generator Pulley |
| Gasket Set & Tool | 23 | Gasket Set, Head Gasket, Valve Stem Seal, Nozzle Protector, Nozzle Seat, Bonnet Gasket, Air Heater Gasket, Exhaust Manifold Gasket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Thermostat operating temperature | 71C | p. 15 |
| Air Heater Voltage | 11V | p. 8 |
| Thermostat Opening Temperature | 71C | p. 15 |
| V-Belt Type/Size | A38.5 | p. 15 |
| Thermo Switch Temperature | 110C | p. 15 |
Yanmar 3TNV84T-XBL / 4JH-DT Series Common Problems This Manual Covers
Overheating and coolant temperature swings
Blocked passages, a tired water pump or a stuck thermostat are the usual suspects when the temperature climbs. The Cooling Water System section identifies the 71C thermostat and the A38.5 V-belt, so one order covers the cooling refresh.
Manual Section: Cooling Water System p. 15Hard starting when cold
Cold-start trouble on these engines often traces back to fuel delivery or a dead intake air heater. The Suction Manifold section lists the 11V air heater along with the intake pipe and manifold gaskets you disturb getting to it.
Manual Section: Suction Manifold p. 8Stalling from fuel starvation
An engine that dies under load and only restarts after bleeding usually has a clogged filter or a cracked hose pulling air. The Fuel Pipe section covers the filter bracket, hose assemblies, clamps and corrugated tube in one spread.
Manual Section: Fuel Pipe p. 20White smoke and rough combustion
Clogged or worn nozzles ruin atomization long before they fail outright. The Fuel Injection Valve section pins down the injector parts by effective machine number so the replacements match your serial range.
Manual Section: Fuel Injection Valve p. 19Injection pump wear from dirty fuel
Contaminated fuel wears the injection pump internals, and the pump is the most expensive fuel component to guess wrong on. The catalog gives the Fuel Injection Pump two full pages of listings for identifying the correct assembly.
Manual Section: Fuel Injection Pump p. 16Low oil pressure and bearing damage
Contaminated oil takes out main and thrust bearings first, and a knock at the bottom end means a full teardown. The Cylinder Block section lists the main and thrust bearing assemblies along with the block, cylinder bushes and camshaft bores they run against.
Manual Section: Cylinder Block p. 4Starter drags or will not engage
Brushes and the pinion wear out on any diesel that lives on short run cycles. The Starter Motor section breaks the unit down to the armature assembly, ball bearings, brushes, switch assembly and pinion assembly.
Manual Section: Starter Motor p. 21Frequently Asked Questions
Which Yanmar engines does this parts catalog cover?
It covers the 3TNV84T-XBL along with the 4JH-DT, 4JH-DTZ, 4JH-DTZA, 4JH-DTZY and 4JH-DTZP under publication number 0CB10-M73401EN. Listed serial prefixes include E00185, E/#21868, E/#25364, E/#27323, E/#30635 and E/#32451. Check your engine plate against these before buying.
Is this a service manual with torque specs and clearances?
No. It is a factory parts catalog: exploded diagrams with reference numbers, part levels, interchangeability symbols and effective machine numbers. The Reference Materials page explains how to read those columns. For cylinder head torque sequences and bearing clearances you would need the separate service manual. p. 2
Does it break down the fuel system?
Yes. The Fuel Injection Pump section runs two pages, and separate sections cover the Governor, Fuel Injection Valve and Fuel Pipe, down to the filter bracket, hose assemblies and clamps. p. 16
How quickly can I access this manual after buying?
This is a 26-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print specific sections of this manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
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