All 175 pages of this Yanmar 3TN100E, 4TN100E, 4TN100TE Service Manual PDF (OEM #0000AOC1927 T 8905) focus on getting your TN 100 series industrial diesel engine back to factory condition. Inside, you get complete fuel injection equipment teardowns, detailed electrical system wiring diagrams, and a full troubleshooting section to track down hard-starting issues. Open to the basic engine section to find step-by-step procedures for the cylinder block, head, and timing gear, backed by page after page of exploded views. Verify the water pump impeller to body clearance at 0.3 to 0.7 mm, and confirm your fuel injection nozzle opening pressure sits exactly between 200 and 210 kg/cm² before firing it up. Guessing at clearances costs you time and money. Grab this bookmarked download, open it on your tablet right in the shop, and fix the engine properly on the first attempt.
What's Inside This Yanmar 3TN100E, 4TN100E, 4TN100TE Manual
| System | Pages | Key Topics |
|---|---|---|
| Yanmar Service Manual | 1 | Basic Engine, Fuel Injection Equipment, Lubricating System, Cooling System, Air Induction System, Electrical System |
| Preface | 2-3 | - |
| General | 4-19 | Specifications, Performance Curves, Cross Sectional Views, Dimensions, Maintenance |
| Basic Engine | 20-52 | Cylinder Block, Cylinder Head, Piston and Piston Pins, Connecting Rod, Crankshaft and Main Bearing, Camshaft and Tappets, Timing Gear, Flywheel |
| Fuel Injection Equipment | 53-96 | Fuel Supply System, Disassembly, Reassembly and Inspection of Governor, Reassembly and Inspection of Fuel Injection Pump |
| Lubricating System | 97-109 | Lubrication System, Lube Oil Pump, Lube Oil Filter & Oil Pressure Control Valve, Oil Cooler, Piston Cooling Nozzle, Oil Pressure Control Valve |
| Cooling System | 110-119 | Radiator Fan Belt, Thermostat, Cooling Water Pump |
| Air Induction System | 120-136 | Air Cleaner, Turbocharger |
| Electrical System | 137-158 | Wiring Diagram, Starter Motor, Alternator, Starting Aids |
| Disassembly and Reassembly | 159-174 | Disassembly, Reassembly, Bolt/Nut Tightening Torque |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Nozzle opening pressure | 200 - 210 kg/cm² | p. 87 |
| Fuel injection nozzle retainer nut tightening torque (to cylinder head) | 0.4 ~ 0.5 kg-m (2.9 ~ 3.6 ft-lb) | p. 171 |
| Fuel injection pump driving gear nut torque | 11.5 ~ 12.5 kg-m | p. 174 |
| Water pump impeller to body clearance (Standard) | 0.3 ~ 0.7 mm | p. 117 |
| Cooling water pump support tightening torque | 1.8 ~ 2.3 kg-m (13 ~ 16.7 ft-lb) | p. 171 |
| Valve clearance (Intake and exhaust) | 0.27 – 0.33 mm (0.0106 – 0.0130 in) | p. 32 |
| Radiator cap working pressure | 0.9 kg/cm² (0.98/12.8 PSI) | p. 112 |
| Alternator nominal output | 12V-40A | p. 149 |
| Connecting rod clamping bolt torque | 11.5 – 12.5 kg-m | p. 174 |
Yanmar 3TN100E, 4TN100E, 4TN100TE Common Problems This Manual Covers
Yanmar TN 100 series engine won't start in cold weather and produces excessive white smoke p. 87
Remove the fuel injectors and test the nozzle opening pressure. Verify the pressure reaches 200 - 210 kg/cm² as specified on page 87. If pressure falls below this limit, clean or replace the nozzle assembly. Reinstall and torque the retainer nut to 0.4 - 0.5 kg-m.
Manual Section: Fuel Injection EquipmentRapidly rising coolant temperature under load with coolant leaking around the front timing cover p. 117
Inspect the cooling water pump for internal wear. Drain the coolant and remove the pump housing. Measure the water pump impeller to body clearance to ensure it measures exactly 0.3 - 0.7 mm as detailed on page 117. Replace the impeller if the clearance exceeds standard limits.
Manual Section: Cooling SystemRough idling, poor combustion, and noticeable ticking noise coming from the cylinder head p. 32
Adjust the intake and exhaust valve lash. Remove the valve cover and rotate the engine to top dead center. Set the valve clearance to 0.27 - 0.33 mm (0.0106 - 0.0130 in) using a feeler gauge as instructed on page 32. Recheck clearances after tightening the adjustment locknuts.
Manual Section: Basic EngineSudden loss of power and abnormal engine knocking noise during heavy industrial operation p. 174
Check the fuel injection pump timing and drive gear security. Remove the front timing cover and inspect the gear assembly. Torque the fuel injection pump driving gear nut to 11.5 - 12.5 kg-m as specified on page 174. Retime the injection pump if the gear slipped.
Manual Section: Disassembly and ReassemblyFrequently Asked Questions
What are the torque specs for the cylinder head?
The cylinder head bolts should be tightened in three steps: first to 5 kgf·m (36.17 ft·lb), then to 10 kgf·m (72.35 ft·lb), and finally to 15 kgf·m (108.52 ft·lb).
Document Quality
This document is a scanned PDF, not a native digital file. As a result, the text is image-only, meaning you cannot search or copy text directly from the document. The text quality is generally clear and readable, though some pages exhibit minor fading or slight blur. Diagrams and illustrations are raster images (scanned drawings) with mostly readable labels, but some fine details may lack crispness. Page condition is fair; you will notice scan artifacts like speckling, especially along the left margins, and several blank pages are included between sections.
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