Part of the Yanmar Repair Manuals.
Dropping a cylinder head back onto a small Yanmar diesel without the nut sequence and torque figure in front of you is how heads warp and gaskets weep. This factory-level service manual covers the Yanmar T-(H)LE series two and three cylinder diesels: 2T72HLE, 2T75HLE, 3T72HLE, 3T75HLE, 2T90LE, 3T80LE and 3T90LE, whether the engine is still installed or stripped on a stand.
Across 286 pages it works through the cylinder head and valves, pistons, connecting rods, crankshaft, camshaft and timing gear, lubrication, cooling, the fuel injection pump and nozzles, governor, air induction, the electrical system with wiring diagram, and P.T.O. facilities, then finishes with full disassembly and assembly procedures and a troubleshooting chapter.
Each system chapter opens with service information, inspection limits and tightening torques, so you rebuild to spec instead of guessing. Delivered as a bookmarked English PDF you can download and print.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 3-36 | External View, Scope, Specifications, Performance Curves, Sectional Views, Accessories, Fuel, Lubricant and Coolant |
| Maintenance | 37-44 | Maintenance Schedule, Maintenance Procedure, Bleeding Air From the Fuel Injection Equipment, Long Term Storage |
| Cylinder Head & Valve | 45-74 | Service Information, Loosening Order of Cylinder Head Nuts, Disassembly, Repair, Assembly, Tightening Torque |
| Engine Proper | 75-120 | Service Information, Piston, Connecting Rod, Cylinder Sleeve, Cylinder Block, Crankshaft, Camshaft, Timing Gear |
| Lubrication System | 121-128 | Service Information, Oil Pump, Oil Filter, Oil Pressure Control Valve |
| Cooling System | 129-138 | Service Information, Radiator, Cooling Water Fan Belt, Thermostat, Cooling Water Pump, Cooling Water Check, Remedies for Overheating, Cooling Water Capacity |
| Fuel System | 139-166 | Service Information, Fuel Injection Pump, Fuel Injection Nozzle, Fuel Filter, Fuel Lift Pump |
| Governor System | 167-174 | Governor, Governor Linkage |
| Air Induction System | 175-178 | Air Cleaner |
| Electrical System | 179-218 | Wiring Diagram, Battery, Starter Motor, Charging Equipment, Warning System, Cold Starting Aids |
| P.T.O. Facilities | 219-232 | Flywheel, Substantial P.T.O. Equipment, Side and Thrust Loads |
| Engine Disassembly and Assembly | 233-270 | Service Information, Disassembly, Assembly, Engine Operating Instructions |
| Troubleshooting | 271-286 | Engine Is Hard to Start, Pinion Engages with Ring Gear But Starter Does Not Turn, Engine Turns at Full Speed Before Pinion Engages with Ring Gear |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 2T72HLE, 2T75HLE, 3T72HLE, 3T75HLE | ||
| Cylinder head tightening torque (2T72HLE, 2T75HLE, 3T72HLE, 3T75HLE) | 10.0 kgf-m (98.1 Nm/72.3 lbf-ft) | p. 69 |
| 3T80LE | ||
| Cylinder head tightening torque, 3T80LE | 16.0 kgf-m (156.9 Nm/115.7 lbf-ft) | p. 69 |
| All Models | ||
| Standard tightening torque (M6 x 1.0) | 0.8 ~ 1.0 kgf-m (7.8 ~ 9.8 Nm / 6 ~ 7 lbf-ft) | p. 29 |
| Standard tightening torque (M8 x 1.25) | 2.5 ~ 2.7 kgf-m (24.5 ~ 26.5 Nm / 18 ~ 20 lbf-ft) | p. 29 |
| 2T72HLE, 2T75HLE | ||
| Cylinder Head Tightening Torque (2T72HLE, 2T75HLE) | 10.0 kgf-m (98.1 Nm/72.3 lbf-ft) | p. 73 |
