Part of the Yanmar Repair Manuals.
Need the factory rebuild procedures for your Yanmar 4TNV84T-DFM diesel engine? This 300-page technical manual (OEM #TM 9-2815-538-24&P) walks you from valve lash adjustment through full turbocharger teardown, built to U.S. Army field-level maintenance standards. Chapter 2 gives you a complete troubleshooting index: starting malfunctions, exhaust smoke diagnosis, combustion sound faults, and overheating, each walking through isolation steps down to component-level decisions. Inside the procedures section: fuel injector nozzle pressure testing, cylinder head R&R, compression checks, turbocharger axial play measurement, and flywheel assembly, backed by exploded-view figures and a full PMCS schedule. Torque your 18 head bolts in sequence: 30.31 to 34.60 lb-ft on the initial pass, then 62.91 to 67.19 lb-ft final. Any injector with nozzle pressure below 3,133 psi gets replaced. Your engine is down. Bookmarked chapters put you on the right spec in seconds; open it on your phone, walk to the machine, and get to work.
What's Inside This Yanmar 4TNV84T-DFM / -DEM Manual
| System | Pages | Key Topics |
|---|---|---|
| Introductory Information With Theory of Operation | General Information, Equipment Description and Data, Theory of Operation | |
| Troubleshooting Procedures | Troubleshooting Index | |
| Maintenance Instructions | Service Upon Receipt, PMCS Including Lubrication Instructions, General Maintenance, Battery Charging Alternator (24 Vdc), Fan, V-Pulley, and V-Belt, Water Pump Assembly, Thermostat, Cover, and Temperature Switch, Gear Case Assembly, Fuel Injection Pump Assembly, Fuel Filter and Fuel Hoses, Oil Cooler Assembly and Oil Pressure Switch, Starter Motor Assembly, Fuel Injectors, Compression Test, Cylinder Head Assembly, Valve Lash Adjustment, Intake Manifold and Air Heaters, Turbocharger Assembly and Exhaust Manifold, Flywheel Assembly and Flywheel Housing, Torque Limits | |
| Supporting Information | References, Maintenance Allocation Chart (MAC), Repair Parts and Special Tools List, Expendable and Durable Items List, National Stock Number Index, Part Number Index |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder head bolts initial torque | 30.31 to 34.60 lb-ft (41.1 to 46.9 Nm) | p. 160 |
| Cylinder head bolts final torque | 62.91 to 67.19 lb-ft (85.3 to 91.1 Nm) | p. 160 |
| Exhaust manifold bolts torque | 16.7 to 21.0 lb-ft (22.6 to 28.4 Nm) | p. 177 |
| Fuel injection pump assembly drive gear nut torque | 57.5 to 64.9 lb-ft (78 to 88 Nm) | p. 129 |
| Fuel injector nozzle pressure replacement threshold | Less than 3,133 to 3,278 psi (21.6 to 22.6 MPa) | p. 151 |
| Fuel injector nozzle case nut torque | 28.9 to 32.5 lb-ft (39.2 to 44.1 Nm) | p. 151 |
| Valve stem seal part number | 119717-11340 | p. 222 |
| Engine Oil Capacity | 6 qt (5.7L) | p. 35 |
| Normal Operating Oil Pressure | 43 to 56 psi (294 to 391 kPa) | p. 35 |
| Valve Lash Setting (cold engine) Inlet | 0.0059 to 0.098 in. (0.15 to 0.25 mm) | p. 35 |
| Normal Operating Coolant Temperature | 170°F to 200°F (77°C to 93°C) | p. 35 |
| Fuel Consumption Rate | 1.5 gph (5.7 lph) | p. 35 |
