Part of the Yanmar Repair Manuals.
The head is off, the new gasket is sitting on the block, and the job stalls right there without a torque figure: the tightening tables in this book give 25 ±0.5 kgf/m for the cylinder head main bolts, threads oiled, along with figures for rod bolts, flywheel, and main bearings. It is Yanmar's own service publication for the 6CX-ETE marine diesel, number AOA5023 9205SP, 119 pages in English.
The core of the book is teardown and inspection: disassembly and reassembly procedures, then measurement of pistons, sleeves, connecting rods, crankshaft and main bearings against the service standard tables. Fuel injection pump, governor, and injection valve servicing get their own chapter, alongside lube oil, cooling water, electrical equipment, the turbocharger, and the reduction reversing gears.
It is a PDF download, so it prints page by page for the bench and travels on a phone or laptop to wherever the engine sits, in a hull, on a stand, or in a crate.
What's Inside This Yanmar 6CX-ETE Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications | 4-5 | Major Specification, Marine Gear |
| Disassembly and Reassembly | 6-34 | Preparations Before Disassembly and Reassembly, Disassembly and Reassembly Tools, Reassembly Procedures |
| Piston and Piston Pin | 37-40 | Piston, Piston Pin, Piston Ring |
| Connecting Rod | 41 | Inspection of Connecting Rod, Crank Pin Bearing, Piston Pin Bearing |
| Cylinder Sleeve | 42-43 | Measurement of Sleeve, Insertion of Sleeve, Measurement of Projection |
| Cylinder Block | 44 | Inspection for Cracks, Cleaning of Oil Holes, Inspection Procedures |
| Crankshaft and Main Bearing | 44-48 | Inspection of Crankshaft, Side Clearance of Crankshaft, Inspection of Main Bearing, Crankshaft Oil Seal, Measurement of Crankshaft Deflection |
| Camshaft and Valve Gear | 49-50 | Camshaft and Bearing, Tappets, Push Rods |
| Timing Gear | 51 | |
| Lube Oil System | 52-55 | Lube Oil Diagram, Lube Oil Pump, Oil Filter, Lube Oil Pressure Control Valve, Lube Oil Pressure Control Valve for Turbine |
| Cooling Water System | 56-59 | Cooling Water System Diagram, Sea Water Cooling System, Fresh Water Cooling System, Inspection of Thermostat, Water Leakage Check of the Fresh Water System |
| Fuel Oil System | 60-74 | Fuel System, Fuel Filter, Feed Pump, Fuel Injection Pump, Fuel Injection Valve, Governor |
| Piping Diagram | 75-78 | Fuel Oil System, Sea Water System, Fresh Water System, Lube Oil System |
| Electrical Equipment | 79-92 | Starting Motor, Alternator, Electric Wiring Diagram |
| Reduction Reversing Gears | 93-103 | Major Specifications, Power Transmission, Hydraulic System, Clutch, Disassembly and Reassembly |
| Turbocharger | 104-108 | Specifications, Cautions for Installation, Tightening Torque, Service Procedures and Service Standard, Wear Limit |
| Front Driving Equipment | 109 | - |
| Periodic Inspection | 113-114 | Fuel Oil System, Lube Oil System, Cooling Water System, Fuel Injection Pump and Injection Valve, Cylinder Head, Turbocharger |
| Service Standard | 115-116 | Cylinder Liner, Piston Pin, Piston Rings, Cylinder Head, Intake/Exhaust Valve, Crankshaft |
| Adjustment and Set Values | 117 | Injection Start |
| Tightening Torque of Major Bolts and Nuts | 118-119 | Cylinder Head Installation Bolts, Connecting Rod Tightening Bolts, Flywheel Tightening Bolts, Main Bearing Installation Bolts, Cam Shaft Drive Gear Tightening Bolts |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cylinder head installation bolts torque | 25 ±0.5 kgf/m | p. 118 |
| Connecting rod tightening bolts torque | 23 ±0.5 kgf/m | p. 118 |
| Fuel injection valve opening pressure | 240±5 kgf/cm² | p. 67 |
| Fuel filter element replacement interval | Every 250 hrs. of use | p. 65 |
| Fuel filter element part number | 127695-55630 | p. 65 |
| Oil filter relief valve opening pressure | 1.8±0.2kgf/cm² | p. 54 |
| Seawater pump impeller part number | 127695-42010 | p. 56 |
| Seawater pump drive gear tightening nuts torque | 14.5 ±0.5 kgf/m | p. 118 |
| Continuous Rating | 375 HP/2600 rpm | p. 4 |
| Hydraulic Oil Pressure (Marine Gear) | 24 kgf/cm² ±0.5 | p. 5 |
| Cylinder Head Bolt Torque | 25 ±0.5 kgf/m | p. 118 |
| Fuel Injection Pressure | 240 ±5 kgf/cm² | p. 117 |
Yanmar 6CX-ETE Common Problems This Manual Covers
Overheating from a worn seawater impeller
Temperature creeps up under load when the raw water side loses flow through a worn impeller or a fouled cooler. The Cooling Water System section covers the sea water and fresh water circuits, thermostat inspection, and leak checking, and the manual lists the impeller part number 127695-42010.
Manual Section: Cooling Water System p. 56Hard starting after sitting
A 6CX-ETE that cranks but will not fire has usually drawn air into the fuel system or plugged its filters. The Fuel Oil System section covers the feed pump, fuel filter, injection pump, and governor, and gives the filter element part number 127695-55630 with a 250 hour replacement interval.
Manual Section: Fuel Oil System p. 60Low oil pressure when hot
Pressure that sags once the engine warms up points at the lube oil pump, a clogged filter, or the pressure control valve. The Lube Oil System section covers all three, including the separate pressure control valve for the turbine and the filter relief valve setting of 1.8 ±0.2 kgf/cm².
Manual Section: Lube Oil System p. 52Smoke and weak boost under load
Excessive smoke with a flat top end often traces to the turbocharger rather than the injectors. The Turbocharger chapter gives specifications, installation cautions, tightening torques, service procedures, and wear limits for judging whether the unit goes back on or gets rebuilt.
Manual Section: Turbocharger p. 104Starter drags or will not engage
A slow, grinding crank on a cold morning is a starting motor or wiring problem before it is anything else. The Electrical Equipment section covers the starting motor, the alternator, and the electric wiring diagram for chasing the fault through the circuit.
Manual Section: Electrical Equipment p. 79Marine gear slips or engages late
A reduction reversing gear that hesitates going into ahead or slips under throttle needs its hydraulic system and clutch checked. This section covers the structure, power transmission, hydraulic circuit, and clutch, with full disassembly and reassembly, and the hydraulic oil pressure spec of 24 kgf/cm² ±0.5.
Manual Section: Reduction Reversing Gears p. 93Knock traced to crank bearings
A deep knock at speed means measuring the crankshaft before anything goes back together. The Crankshaft and Main Bearing section covers crankshaft inspection, side clearance, main bearing inspection, the oil seal, and deflection measurement against the wear limits.
Manual Section: Crankshaft and Main Bearing p. 44Frequently Asked Questions
Which engine does this manual cover?
The Yanmar 6CX-ETE marine diesel engine, Yanmar publication AOA5023 9205SP. Beyond the base engine it covers the reduction reversing gears (marine gear), the turbocharger, front driving equipment, and the electrical equipment, across 119 pages in English.
Does it include torque specs for reassembly?
Yes. The Tightening Torque of Major Bolts and Nuts section lists cylinder head main bolts at 25 ±0.5 kgf/m and connecting rod bolts at 23 ±0.5 kgf/m, plus flywheel, main bearing, and camshaft drive gear figures. The head bolts go on in three stages, not one: 12 ±0.25 kgf·m, then 18 ±0.5 kgf·m, then the final 25 ±0.5 kgf·m, with the sequence given on page 35. p. 118
Are valve and injection settings listed?
The Adjustment and Set Values section covers intake and exhaust valve settings, injection start, fuel injection pressure at 240 ±5 kgf/cm², top clearance, and lube oil for the engine, clutch, hydro, and turbo. p. 117
Does it cover the marine gear, not just the engine?
Yes. The Reduction Reversing Gears section covers major specifications, power transmission, structure, the hydraulic system, and the clutch, through full disassembly and reassembly. p. 93
How quickly can I access this manual after buying?
You get a 119-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Are there any print restrictions on this 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.
Can I find hydraulic circuit diagrams in this Yanmar 6CX-ETE manual?
The hydraulic coverage here is the marine gear's. The Reduction Reversing Gears section covers its hydraulic system alongside the clutch and power transmission, and the specifications give the marine gear hydraulic oil pressure as 24 kgf/cm² ±0.5 on page 5. The separate Piping Diagram section covers the fuel oil, sea water, fresh water and lube oil circuits.
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