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 Yanmar 2T/3T HLE Series 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 |
Yanmar 2T/3T HLE Series Common Problems This Manual Covers
Engine cranks but will not start
Hard starting after long storage or in cold weather usually traces to fuel supply, compression or cold starting aids, and guessing wrong means parts you did not need. The Troubleshooting chapter starts with Engine Is Hard to Start and works through the causes in order.
Manual Section: Troubleshooting p. 271Air in the fuel injection equipment
Run the tank dry or change a filter without bleeding and the engine will stumble, hunt or refuse to fire. The Maintenance section gives the procedure for bleeding air from the fuel injection equipment, along with the service schedule that keeps filters ahead of trouble.
Manual Section: Maintenance p. 37Overheating and coolant loss
A stuck thermostat, slipping fan belt or tired cooling water pump will cook an engine long before the gauge convinces you to stop. The Cooling System section covers checking, repair and a dedicated Remedies for Overheating procedure.
Manual Section: Cooling System p. 129Low oil pressure
Low oil pressure left unchecked ends in burned bearings and a crankshaft regrind, a far bigger bill than the fix. The Lubrication System section covers the oil pump, filter and oil pressure control valve so you can find the cause before the bottom end pays for it.
Manual Section: Lubrication System p. 121White smoke and rough combustion
White smoke with uneven running points at clogged or misadjusted injection nozzles or fuel injection pump trouble. The Fuel System section covers inspection and service of the injection pump, nozzles, fuel filter and lift pump.
Manual Section: Fuel System p. 139Starter and charging faults
A starter that clicks, drags or spins without engaging can be the battery, the motor or the pinion, and swapping parts blind gets expensive. The Electrical System section covers the battery, starter motor, charging equipment, warning system and cold starting aids, with a wiring diagram.
Manual Section: Electrical System p. 179Low compression from worn valves
Poor compression on one cylinder often comes back to worn valves and seats. The Cylinder Head & Valve section gives the loosening order for the head nuts, inspection and repair limits, and the tightening procedure for reassembly.
Manual Section: Cylinder Head & Valve p. 45Frequently Asked Questions
Which Yanmar engines does this service manual cover?
It covers the Yanmar T-(H)LE series industrial diesels: 2T72HLE, 2T75HLE, 3T72HLE, 3T75HLE, 2T90LE, 3T80LE and 3T90LE. The book really does treat them separately rather than as one family - the cylinder head tightening torque, for instance, is given for the two-cylinder and the three-cylinder engines as different figures on page 69.
Does it give the cylinder head tightening torque?
Yes. The Cylinder Head & Valve section lists 10.0 kgf-m (98.1 Nm / 72.3 lbf-ft) for the 2T72HLE, 2T75HLE, 3T72HLE and 3T75HLE, 16.0 kgf-m (156.9 Nm) for the 3T80LE, and 18.0 kgf-m (176.5 Nm) for the 2T90LE and 3T90LE, along with the nut loosening order. p. 45
Is a wiring diagram included?
Yes. The Electrical System section includes the wiring diagram and covers the battery, starter motor, charging equipment, warning system and cold starting aids. p. 179
Does it cover a complete teardown and rebuild?
Yes. The Engine Disassembly and Assembly section gives full disassembly and assembly procedures plus operating instructions, and the Engine Proper section covers the piston, connecting rod, cylinder sleeve, crankshaft, camshaft and timing gear with service limits. p. 233
What do I get after purchasing this Yanmar T-(H)LE series & variants manual?
Immediate download of the complete 286-page searchable Service Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Am I able to print pages from this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Does this Yanmar T-(H)LE series & variants manual include wiring diagrams?
Beyond the wiring diagram already described above, this book carries no separate harness-routing or connector-pinout material. Do not buy it expecting a standalone electrical volume.
Reviews
There are no reviews yet.