Part of the Yanmar Repair Manuals.
Drop a dial indicator on the crank nose of a stripped TNE block and you need one number: how much endplay is too much. That is the kind of figure this Yanmar factory service manual exists to settle, for the whole TNE family: 2TNE68, 3TNE68, 3TNE74, 3TNE78A, 3TNE82A, 3TNE82, 3TNE84, 3TNE88, 4TNE82, 4TNE84 and 4TNE88, plus the turbocharged 3TNE84T and 4TNE84T.
Whether the engine sits on a stand or is still bolted where it works, the manual takes you from diagnosis to reassembly: compression testing, valve lash, injector pop pressure and spray pattern checks, injection timing, then full measuring procedures with service limits for the head, block, pistons, rods, camshaft and crankshaft. Separate chapters rebuild the injection pumps (indirect and direct), the governor and the turbocharger.
It is a 134 page English PDF, sized to print the pages you need and take them to the bench.
What's Inside This Yanmar TNE Series Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications and Performance | 6-18 | 2TNE68, 3TNE68, 3TNE74, 3TNE78A, 3TNE82A, 3TNE82, 3TNE84, 3TNE88 |
| Cross Sectional Views | 19-21 | Special Swirl Pre-Combustion Chamber System, Direct Injection System |
| Cooling Water, Lubricating Oil and Fuel Oil | 22-24 | Cooling Water, Lubricating Oil, Fuel Oil |
| Troubleshooting | 25-27 | Trouble Causes and Remedies, Trouble Diagnosis Through Measurement of Compression Pressure |
| Special Service Tools and Measuring Instruments | 28-34 | Special Service Tools, Measuring Instruments |
| Measurement, Inspection and Adjustment | 35-49 | Measuring the Compression Pressure, Valve Head Clearance, Checking the V-Belt Tension, Measuring and Checking the Injection Pressure and Spray Patterns of the Fuel Injection Valve |
| Measuring Procedures, Service Data and Corrective Action | 50-76 | Cylinder Head, Cylinder Block, Valve Rocker Arm, Piston and Piston Ring, Connecting Rod, Camshaft, Crankshaft, Gears |
| Disassembly and Reassembly | 77-84 | Disassembly, Precautions Before and During Reassembly |
| Service Data | 85-94 | Cylinder Head, Cylinder Block, Valve Rocker Arm, Piston, Piston Ring, Connecting Rod, Camshaft, Crankshaft |
| Fuel Injection Pump for Indirect Injection System | 97-101 | Fuel Injection Pump, Bottom Cover, Fuel Feed Pump, Governor Weight Assembly, Governor Weight Extractor Tool, Fuel Injection Pump Side Cover, Plunger Guide, Tappet Holders |
| Fuel Injection Pump for Direct Injection System | 102-114 | Fuel Injection Pump, Plunger Guide, Plunger Barrel, Fuel Injection Pump Camshaft, Bearing, Control Rack, Fuel Control Pinion, Governor |
| Governor | 115-128 | Governor Lever Shaft Assembly, Torque Spring Assembly, Springs, Angleich Spring Assembly, Governor Weight Assembly, Stop Lever, Control Lever Shaft, Governor Link |
| Turbocharger | 129-134 | Specifications, Waste Gate Valve Adjusting Method, Exploded View of Turbocharger, Tightening Torque, Service Standards |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| V-belt tension (deflection) | 10-15 mm | p. 37 |
| Intake/exhaust valve head clearance | 0.15 ~ 0.25 mm | p. 37 |
Yanmar TNE Series Common Problems This Manual Covers
Cranks but will not start
Air in the fuel lines, tired injectors, or compression loss all produce the same long crank and no fire. The Troubleshooting section pairs cause and remedy tables with a procedure for diagnosing faults through compression pressure measurement, so you stop guessing which one it is.
Manual Section: Troubleshooting p. 25White smoke and rough running
Poor atomization or late injection timing shows up as white smoke and an uneven idle. This manual walks through measuring injector opening pressure and spray patterns, then checking and adjusting the fuel injection timing.
Manual Section: Measurement, Inspection and Adjustment p. 35Blowby and worn cylinder bores
High hours push ring end gap and bore wear past the point where the engine holds oil and compression. The measuring procedures give service data and corrective action for the cylinder block, pistons and piston rings, so you decide between re-ringing and machining with numbers instead of feel.
Manual Section: Measuring Procedures, Service Data and Corrective Action p. 50Injection pump wear and leaks
A worn pump element or leaking delivery valve robs fuel delivery long before the pump fails outright. Exploded views plus disassembly, inspection and reassembly steps cover the direct injection pump, and a separate chapter handles the indirect injection version.
Manual Section: Fuel Injection Pump for Direct Injection System p. 102Hunting and surging at idle
Sticking linkage or worn governor internals make these engines hunt under light load. The Governor chapter gives exploded views for both the indirect and direct injection systems, with disassembly, inspection and reassembly procedures.
Manual Section: Governor p. 115Turbo down on boost
On the 3TNE84T and 4TNE84T, a lazy waste gate or worn bearings means low boost and smoke under load. The Turbocharger section covers construction, the waste gate valve adjusting method, tightening torque and service standards.
Manual Section: Turbocharger p. 129Overheating from neglected coolant
Industrial diesels that run steady loads cook their coolant, and scale and corrosion follow. The manual specifies the cooling water, lubricating oil and fuel oil the TNE series needs, so a fresh rebuild is not undone by the wrong fluids.
Manual Section: Cooling Water, Lubricating Oil and Fuel Oil p. 22Frequently Asked Questions
Which Yanmar engines does this manual cover?
Thirteen TNE series industrial diesels: 2TNE68, 3TNE68, 3TNE74, 3TNE78A, 3TNE82A, 3TNE82, 3TNE84, 3TNE88, 4TNE82, 4TNE84 and 4TNE88, plus the turbocharged 3TNE84T and 4TNE84T. The Specifications and Performance section gives each model its own data sheet. p. 6
Does it give the valve lash setting?
Yes. Intake and exhaust valve head clearance is 0.15 to 0.25 mm, and the Measurement, Inspection and Adjustment section walks through setting it, alongside checks like V-belt tension (10 to 15 mm deflection) and compression pressure. p. 37
Are the turbocharged models covered?
Yes. The Turbocharger section applies to the turbocharged 3TNE84T and 4TNE84T and covers specifications, construction, the waste gate valve adjusting method, an exploded view, tightening torque and service standards. p. 129
Can I rebuild the injection pump with this manual?
Yes, and it treats the two designs separately. The Fuel Injection Pump for Indirect Injection System section and its direct injection counterpart each give exploded views, disassembly, inspection and reassembly, and the governor gets its own chapter. p. 97
How will I receive this Service Manual?
You get a 134-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Are there any print restrictions on 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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