Part of the Yanmar Repair Manuals.
Pull the head off a 2TM and the number you need before it goes back on is 13.5 to 14.5 kg-m on the head nuts, tightened in sequence. That figure is in this Yanmar service manual, along with main bearing torque of 19 to 21 kg-m, ring end gaps, and injector opening pressure for the 2TM, 3TM, and 4TM marine diesels.
There is rarely anyone to phone when one of these engines is in pieces on a stand. These 182 pages stand in: cylinder block, liners, pistons, crankshaft, injection pump and governor, lubrication, sea water cooling, the reduction and reversing gear (with separate procedures for the 2TM/3TM and the 4TM), electrical system, and stern bearings.
It is a bookmarked PDF, so you can jump from a symptom in the troubleshooting chapter to the spec table at the back, print the pages you need, and get the engine back together.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 4-24 | External Veiw, Specifications, Performance Curves, Engine Cross-Section, Piping Diagram, Disassembly and Reassembly Tools |
| Basic Engine | 25-65 | Cylinder Block, Cylinder Liner, Cylinder Head, Piston, Connecting Rod, Crankshaft, Camshaft, Timing Gears |
| Fuel System | 66-88 | Fuel Supply System, Injection Pump, Governor and Linkage, Fuel Injection Nozzle, Fuel Feed Pump, Fuel Filter, Water Separator, Fuel Tank (Option) |
| Intake and Exhaust System | 89-91 | Intake Port, Exhaust Pipe, Exhaust Silencer, Exhaust Manifold, Cylinder Head, Gasket Packing, Fuel Oil Pump |
| Lubrication System | 92-104 | Oil Pump, Oil Filter, Oil Cooler |
| Cooling System | 105-113 | Water Pump, Kingston Cock, Sea Water Filter (Option) |
| Chain Overdrive Hand-Operated System | 114-116 | Sprocket Wheel, Camshaft Gear, Crankshaft Gear, Roller Chain, Starting Shaft Support |
| Reduction and Reversing Gear | 117-143 | Governor Assembly, Reversing Gear Upper Case, Reversing Gear Shaft Assembly, Clutch Housing, Reversing Gear Box, Thrust Shaft, Thrust Gear |
| Electrical System | 144-168 | Composition, Battery, Starter Motor, Alternator, Option |
| Stern Equipment | 169-171 | Stern Arrangement (Yanmar Standard), Stern Bearings |
| Troubleshooting | 172-176 | Flywheel, Starter, Fuel System, Piston, Bearings, Valves, Oil Pump, Water Pump |
| Inspection and Servicing | 177-181 | Fuel Oil, Lube Oil, Cooling Water, Fuel Injection Pump, Fuel Injection Valve, Cylinder Head, Electrical Equipment, Marine Gear |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder head fixing nut tightening torque | 13.5 ~ 14.5 kg-m (97.8 ~ 105 lb-ft) | p. 180 |
| Fuel injection pump fixing nut tightening torque | 0.9 ~ 1.1 kg-m (6.5 ~ 8.0 lb-ft) | p. 180 |
| Main bearing bolt tightening torque | 19 ~ 21 kg-m (138 ~ 152 lb-ft) | p. 180 |
| Allowable error between cylinders (Fuel injection volume) | ±0.5cc/1000 st. | p. 72 |
| Piston ring end gap (No. 1,2,3) - Standard | 0.25 ~ 0.45 mm (0.0098 ~ 0.0177 in.) | p. 179 |
| Piston ring end gap (Oil ring) - Standard | 0.20 ~ 0.40 mm (0.0079 ~ 0.0157 in.) | p. 179 |
| Filter type | Paper type | p. 85 |
| Filtration area | 4000cm² | p. 85 |
| Cylinder Head Bolt Tightening Torque | 13.5 ~ 14.5 kg-m | p. 28 |
| Main Bearing Cap Bolt Tightening Torque | 19 ~ 21 kg-m | p. 54 |
| Nozzle Valve Opening Pressure | 200 ~ 205 kg/cm² | p. 79 |
