Part of the Yanmar Repair Manuals.
A connecting rod hanging half torqued on the stand stops the whole rebuild if the one figure you need is missing. This Yanmar service manual for the 1SM, 2SM, and 3SM diesel engines is where those figures live: the 9 kg-m (65 ft-lb) rod bolt torque, the 160 kg/cm² injection pressure for the nozzle tester, the 2 to 2.5 kg/cm² lubricating oil pressure the factory set at delivery.
Across 104 pages (publication A0A1005.8511) it walks the full teardown and reassembly in order, then handles the fuel injection pump, injection valve, cylinder head, cylinder liner replacement, pistons and rods, and clutch housing separately. Adjustment procedures, maintenance standards for main parts, and a troubleshooting chapter covering the reduction reversing gear round it out, with approved oils listed at the back.
It downloads as a bookmarked PDF, so the same book is on the bench, on a laptop, or printed page by page wherever the engine sits apart.
What's Inside This Yanmar 1SM, 2SM, 3SM Manual
| System | Pages | Key Topics |
|---|---|---|
| Preface | 6 | - |
| Outline of Structures | 7 | - |
| Fuel and Lubricating Oil | 8-12 | Fuel (Light Oil, Properties of Fuel & Engine Performances, Cautions on Fuel), Lubricating Oil (Engine Oil) |
| Servicing and Periodical Checking | 13-17 | 3-1.Main Points of Servicing and Training, 3-2.Time of Periodical Checking |
| Engine Disassembly | 18-34 | 4-1.Preparation for Disassembly, 4-2.Precautions for Disassembly, 4-3.Disassembling Procedure |
| Engine Reassembly | 35-52 | 5-1.Precautions for Reassembly, 5-2.Reassembling Procedure |
| Disassembly and Reassembly of Other Parts | 53-71 | 6-1.Fuel Injectoin Pump, 6-2.Fuel Injection Valve, 6-3.Cylinder Head, 6-4.Replacement of Cylinder Liner, 6-5.Piston Rings, Piston and Connecting Rod, 6-6.Clutch Housing |
| Adjustment and Servicing | 72-90 | 7-1.How to Adjust the Adjusting Part, 7-2.Servicing and Repairing of Major Parts, 7-3.Maintenance Standards of Main Parts |
| Countermeasures to Engine Troubles | 91-99 | 8-1.Engine Troubles, Causes and Measures, 8-2.Causes and Measures for Reduction Reversing Gear |
| Storage of Engine | 100 | - |
| List of Approved Oils | 101-103 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Piston & Connecting Rod bolt torque | 9 kg-m (65 ft-lb) | p. 66 |
| Fuel injection pressure | 160 kg/cm² | p. 70 |
| New engine lubricating oil pressure (delivery from factory) | 2~2.5 kg/cm² | p. 74 |
| Lubricating oil pressure (cold weather start) | 4 kg/cm² | p. 74 |
| Lub. Oil Change Interval | 3000 hr. | p. 16 |
| Lub. Oil Pressure (delivery) | 2-2.5 kg/cm² | p. 74 |
Yanmar 1SM, 2SM, 3SM Common Problems This Manual Covers
Hard starting after a long layup
An engine that sat idle often cranks without firing because air has worked into the fuel system or the filters have clogged. The Countermeasures to Engine Troubles chapter lists starting failures with their causes and the measures to take, so you work down a list instead of guessing.
Manual Section: 8.Countermeasures to Engine Troubles p. 91Rough running and exhaust smoke
Smoke and uneven running usually trace back to injectors that no longer atomize properly. The manual covers removing and servicing the fuel injection valve and setting pop pressure to 160 kg/cm² on a nozzle tester.
Manual Section: 6.Disassembly and Reassembly of Other Parts p. 53Low oil pressure or bearing knock
Falling oil pressure points at pump wear, blocked passages, or bearing clearance gone past the limit. The manual gives the factory delivery setting of 2 to 2.5 kg/cm² so you can judge a gauge reading before deciding to open the crankcase.
Manual Section: 7.Adjustment and Servicing p. 72Blow-by from worn liners and rings
High-hour engines lose compression and start burning oil as the rings and liners wear. Cylinder liner replacement and piston ring fitting each get their own step-by-step procedure, along with piston and connecting rod work.
Manual Section: 6.Disassembly and Reassembly of Other Parts p. 53Head gasket leaks after top-end work
A cylinder head that goes back on out of sequence weeps compression or coolant soon after. The reassembly chapter sets out the order and precautions for putting the engine back together so the joint seals the first time.
Manual Section: 5.Engine Reassembly p. 35Wrong oil shortens engine life
These engines predate modern oil labeling, so grabbing whatever is on the shelf is a gamble. The manual explains engine oil selection and fuel requirements, and closes with a list of approved oils by brand.
Manual Section: 2.Fuel and Lubricating Oil p. 8Reversing gear noise or slipping
Trouble in the reduction reversing gear shows up as noise, slip, or failure to engage. The troubleshooting chapter includes a dedicated table of causes and measures for the reversing gear alongside the engine faults.
Manual Section: 8.Countermeasures to Engine Troubles p. 91Frequently Asked Questions
Which Yanmar engines does this service manual cover?
It covers the Yanmar 1SM, 2SM, and 3SM diesel engines, publication A0A1005.8511, 104 pages in English. The content follows the engine itself: disassembly, reassembly, adjustment, and troubleshooting, whatever the engine is installed in.
Does it give torque specs and wear limits?
Yes. The procedures carry torques where you need them, for example 9 kg-m (65 ft-lb) on the connecting rod bolts in the piston and connecting rod work, and the Maintenance Standards of Main Parts tables collect dimensions and limits for judging worn components. p. 53
What should the lubricating oil pressure be on the Yanmar 1SM, 2SM, 3SM diesel engine?
The engine side lubricating oil pressure is set at 2 to 2.5 kg/cm² at delivery from the factory, and it can reach 4 kg/cm² immediately after starting in cold weather. The Adjustment and Servicing chapter covers checking and adjusting it. p. 72
How quickly can I access this manual after buying?
You get a 104-page searchable PDF (7 MB) that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Does this Yanmar 1SM manual allow printing?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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