Part of the Yanmar Repair Manuals.
Lay the SKE's cylinder head on the bench and two numbers decide how the day ends: 10 kg-m on the head bolts and 0.15 mm of cold valve lash. Both come straight out of this Yanmar SKE service manual, publication A0A1027, a 63-page English PDF built around putting this engine back together correctly.
Inside are Yanmar's installation procedures for the engine, from stern tube and engine bed through alignment and cooling water piping, plus periodic checks at 50, 250, 500 and 1500 hour intervals, clearance and tolerance tables for the main components, wear exchange standards, a tightening torque list, troubleshooting charts, the optional fuel feed pump, and the approved oil list.
Guess a clearance and you pay for it with the wrong part and a second teardown. Measure against the printed limit instead, torque it once to spec, and get the engine running again.
What's Inside This Yanmar SKE Manual
| System | Pages | Key Topics |
|---|---|---|
| General Description | 5-8 | Name of Parts, Data and Settings, Piping Diagram, Dimensions |
| Installation | 9-13 | Installation of Stern Tube, Selection of Engine Bed and Installation, Installation of Sea Cock, Alignment, Cooling Water Piping Installation, Fuel Tank Installation |
| Power Transfer (Power Take Off) | 14-15 | Pulley, Flywheel, Bearing, Engine |
| General Servicing | 16-39 | Main Points of Servicing, Time of Periodic Checks (Table of Periodic Checks, Every 50 Hours, Every 250 Hours, Every 500 Hours, Every 1500 Hours, Other Time Interval Check) |
| Maintenance Standards for Main Components | 40-49 | Engine Disassembly Precautions, Clearance & Tolerance of Main Components, Exchange Standards for Wear of Main Parts, Specified Tightening Torque for Major Parts |
| Trouble Shooting | 50-58 | Fuel Injection Valve, Fuel Injection Pump, Governor, Cooling Water Pump, Lubricating Oil Pump, Reduction Reversing Gear |
| Fuel Feed Pump (Optional Parts) | 59-60 | Fuel Feed Pump, Fuel Injection Pump, Fuel Pipe, Fuel Strainer Bracket, Oil Level Stick, O-Ring |
| List of Approved Oils | 61-62 | Diesel Oils, Lubricating Oils |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fuel injection pressure (start) | 160 kg/cm² | p. 6 |
| Fuel injection timing (start) | 12° ±1° Before Top Dead Center (BDC) | p. 6 |
| Cylinder head bolts tightening torque | 10 kg-m | p. 49 |
| Oil pressure (hand start) at 2,400 rpm | 2-2.5 kg/cm² | p. 6 |
| Rated Engine Speed | 2,400 rpm | p. 6 |
| Cylinder Bore x Stroke | 92 x 100 mm | p. 6 |
| Valve Clearance (Cold Engine) | 0.15 mm | p. 6 |
| Engine Oil Change Interval | Every 500 hours | p. 20 |
| Flywheel Retaining Nut Tightening Torque | 24 kg-m | p. 49 |
| Connecting Rod Bolts & Nuts Tightening Torque | 6.6 kg-in | p. 49 |
Yanmar SKE Common Problems This Manual Covers
Cranks but refuses to start
Air in the fuel lines or a starved feed system will keep a small diesel cranking all morning. The troubleshooting charts run the no-start symptoms in order, from fuel supply through injection, so you fix the actual cause instead of swapping parts.
Manual Section: Trouble Shooting p. 46Oil pressure sags at rated speed
The manual lists 2 to 2.5 kg/cm² at 2,400 rpm (hand start) as the healthy figure; a gauge reading below that points at the lubrication circuit, not the sender. The troubleshooting section traces low pressure back through the pump, passages and bearings.
Manual Section: Trouble Shooting p. 46Injectors drift off pop pressure
Pop pressure falls as nozzles wear, and the spray quality goes with it: smoke, hard starting, rough running. The servicing section sets pressure back to the 160 kg/cm² figure using the pressure controlling plates; one 0.1 mm plate moves it about 10 kg/cm².
Manual Section: General Servicing p. 12Clattering valve train, lost lash
Valve lash opens up with hours and the tappets tell you first. The periodic check tables schedule the adjustment, and the cold setting is 0.15 mm.
Manual Section: Time of Periodic Checks p. 15Blow-by from worn rings and bore
Blow-by, rising oil consumption and soft compression mean the rings and bore are past their service limits. The exchange standards table gives the wear point at which each main part comes out rather than goes back in.
Manual Section: Exchange Standards for Wear of Main Parts p. 42Bottom end knock after long hours
A knock that grows with load usually means main or rod bearing clearance has opened past tolerance. Measure during teardown against the clearance and tolerance table before you order parts, not after a second teardown proves the guess wrong.
Manual Section: Clearance & Tolerance of Main Components p. 40Runs hot on restricted cooling water
A blocked sea cock or badly routed cooling water piping will overheat this engine under load. The installation section covers sea cock installation and cooling water piping layout so the raw water side flows the way Yanmar intended.
Manual Section: Installation p. 5Frequently Asked Questions
Which engine does this manual cover?
It covers the Yanmar SKE engine and is Yanmar publication A0A1027. On page 6 the Data and Settings section gives a 92 x 100 mm bore and stroke and a rated speed of 2,400 rpm, so you can confirm your engine against the printed specifications before you buy.
Does it include torque specifications for reassembly?
Yes. The Specified Tightening Torque for Major Parts table lists figures such as 10 kg-m for the cylinder head bolts and 24 kg-m for the flywheel retaining nut, alongside the clearance and tolerance data you need for the rest of the rebuild. p. 45
Does it give wear limits for a full rebuild?
Yes. The Maintenance Standards for Main Components section covers disassembly precautions, clearance and tolerance of the main components, exchange standards for worn parts, and the tightening torque table, which is the core of what you need with the engine apart on a stand. p. 36
Will it help diagnose a no-start or low oil pressure problem?
The Trouble Shooting section works through running faults symptom by symptom, and the Data and Settings page gives the healthy baselines, such as 2 to 2.5 kg/cm² of oil pressure at 2,400 rpm, so you know when a reading is genuinely out of line. p. 46
What do I get after purchasing this Yanmar SKE manual?
You get a 63-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Can I print specific sections of this Service Manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Are electrical wiring diagrams included in this Yanmar SKE Service Manual?
Yes, full electrical schematics are included with wire colors, connector locations, and circuit descriptions.
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