Part of the Yanmar Repair Manuals.
Set the crank at top dead center, slide a feeler gauge under the rocker, and you need the correct lash figure for your exact engine before touching the adjuster. This Yanmar TNV series service manual (publication 0BTNV0-G0000, 370 pages) walks the 3TNV82A, 3TNV84, 3TNV84T, 3TNV88, 4TNV84, 4TNV84T, 4TNV88, 4TNV94L, 4TNV98, 4TNV98T, 4TNV106, and 4TNV106T end to end: general service data, periodic maintenance, engine teardown, fuel system, cooling, lubrication, turbocharger, starter, alternator, wiring, and troubleshooting.
Whether the engine sits in a genset, a pump, a boat, or on a stand in your shop, the procedures are the same, and when it is just you and a half-stripped block, there is no dealer tech to ask. The compression measurement methods, troubleshooting charts, and torque and clearance tables are the figures a rebuild lives or dies on.
Once downloaded, the PDF is yours to keep for this engine: print the pages that will get greasy, keep the rest on a tablet at the bench.
What's Inside This Yanmar TNV Series Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 5-6 | - |
| Warranties | 7-14 | Yanmar Limited Warranty, What Is Covered by This Warranty?, How Long Is the Warranty Period?, What the Engine Owner Must Do, Emission System Warranty |
| Safety | 15-36 | - |
| General Service | 37-84 | Component Identification, Location of Labels, Emission Control Regulations, Engine Family, Major Engine Components, Diesel Fuel, Engine Oil, Engine Coolant |
| Periodic Maintenance | 85-124 | Before You Begin Servicing, The Importance of Periodic Maintenance |
| Engine | 125-218 | - |
| Fuel System | 219-256 | - |
| Cooling System | 257-268 | - |
| Lubrication System | 269-284 | Oil Pump Service Information, Lubrication System Diagram, Checking Engine Oil Pressure, Trochoid Oil Pump, Disassembly of Oil Pump, Cleaning and Inspection |
| Turbocharger | 285-300 | Specifications, Turbocharger Service Information, Troubleshooting, Turbocharger Components, Turbocharger Component Functions, Washing Procedure |
| Starter | 301-320 | Starter Motor Information, Starter Motor Specifications, Starter Motor Troubleshooting, Starter Motor Components, Removal of Starter Motor, Installation of Starter Motor |
| Alternator | 321-342 | Dynamo and Alternator Information, Alternator Specifications, Alternator Troubleshooting, Alternator Components, Alternator Wiring Diagram, Alternator Standard Output |
| Electric Wiring | 343-350 | Electric Wiring Precautions, Electrical Wire Resistance, Battery Cable Resistance, Electrical Wire Sizes - Voltage Drop, Conversion of Awg to European Standards |
| Troubleshooting | 351-370 | Special Service Tools, Troubleshooting by Measuring Compression Pressure, Compression Pressure Measurement Method, Quick Reference Table for Troubleshooting, Troubleshooting Charts |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 3TNV82A, 3TNV84, 3TNV84T, 3TNV88, 4TNV84, 4TNV84T, 4TNV88 | ||
| Cylinder Head Bolt Torque | 63 - 67 ft·lb (85.1 - 91.1 N·m; 8.7 - 9.3 kgf·m) | p. 147 |
| 3TNV82A to 4TNV88 | ||
| Fuel Injector Retainer Bolt Torque | 29 ft·lb (39.2 N·m; 4 kgf·m) | p. 226 |
| 4TNV106, 4TNV106T | ||
| Valve Clearance | 0.010 - 0.014 in. (0.25 - 0.35 mm) | p. 130 |
| All Models | ||
| Thermostat Full Opening Lift Temperature | 157 - 163°F (70°C - 73°C) | p. 80 |
| Output Allowable Deviation (After Break-In) | ± 3% | p. 55 |
Yanmar TNV Series Common Problems This Manual Covers
Hard starting after sitting unused
Air in the fuel lines, clogged filters, or water contamination will keep a TNV from lighting off after storage or a filter change. The fuel system section covers the injection equipment so you can restore clean, air-free delivery.
Manual Section: Section 7 Fuel System p. 219Overheating under sustained load
A fouled radiator, stuck thermostat, or tired water pump shows up first as climbing temperature under load and coolant loss. The cooling system section walks through inspecting and servicing these components before a head gasket pays the price.
Manual Section: Section 8 Cooling System p. 257Low oil pressure at speed
Worn trochoid oil pump rotors let pressure sag at rated speed, and bearings follow soon after. The lubrication section includes the system diagram, the oil pressure checking procedure, and disassembly and inspection of the trochoid pump.
Manual Section: Section 9 Lubrication System p. 269Boost loss or turbo oil leaks
On the turbocharged T variants, worn seals and bearings show up as oil weeping at the compressor, whistle, and lost boost. The turbocharger section gives component functions, troubleshooting, and the washing procedure.
Manual Section: Section 10 Turbocharger p. 285Starter clicks but will not crank
A dragging or dead starter motor is a common failure on engines that live outdoors and start cold. The starter section covers troubleshooting, component breakdown, and removal and installation of the motor.
Manual Section: Section 11 Starter p. 301Battery going flat between runs
A weak alternator or bad wiring quietly discharges the battery until one morning the engine will not spin. The alternator section provides specifications, troubleshooting steps, the wiring diagram, and standard output figures to test against.
Manual Section: Section 12 Alternator p. 321Blow-by, smoke, and weak compression
Worn rings, cylinder wear, or valve trouble show up as crankcase pressure, oil consumption, and soft starting. The troubleshooting section lays out the compression pressure measurement method and quick reference charts to isolate the cause before teardown.
Manual Section: Section 14 Troubleshooting p. 351Frequently Asked Questions
Which Yanmar engine models does this service manual cover?
It covers the TNV series industrial diesels: 3TNV82A, 3TNV84, 3TNV84T, 3TNV88, 4TNV84, 4TNV84T, 4TNV88, 4TNV94L, 4TNV98, 4TNV98T, 4TNV106 and 4TNV106T, including the turbocharged T variants. Where the models differ the manual splits the figures by engine - the oil capacity table on page 50 is the first of them. It is Yanmar publication 0BTNV0-G0000, 370 pages.
Does it include cylinder head bolt torque specs?
Yes. The Engine section gives the cylinder head bolt torque, 63 to 67 ft-lb for the 3TNV82A through 4TNV88 models, along with the other fastener torques and clearances you need for reassembly. p. 125
Does it explain how to diagnose low compression?
Yes. The Troubleshooting section covers troubleshooting by measuring compression pressure, including the measurement method, special service tools, a quick reference table, and troubleshooting charts to trace the fault to rings, valves, or head sealing. p. 351
How will I receive this Service Manual?
This is a 370-page searchable PDF (18 MB) 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.
Are there any print restrictions on this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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