Part of the Yanmar Repair Manuals.
Torque a 6CXM-GTE cylinder head from a forum guess and you find out at sea whether the gasket held. Yanmar publication M9961-H13021 is where the real numbers live: the factory service manual for the 6CXM-GTE and 6CXM-GTE2 marine diesel engines, 132 pages of the procedures Yanmar's own technicians work from, delivered as a PDF.
The book walks the whole engine: disassembly and reassembly, then inspection and servicing of the cylinder head, pistons and piston pins, connecting rods, cylinder sleeves and block, crankshaft and main bearings, camshaft and valve gear, timing gear, lube oil, cooling water and fuel oil systems, electrical equipment, and the turbocharger. Wiring and piping diagrams and specifications sit in the General section up front.
Service standards, adjustment and check values, a tightening torque table for the major bolts, and a symptom-based troubleshooting chapter close it out. Bought once, it stays with the engine.
What's Inside This Yanmar 6CXM-GTE, 6CXM-GTE2, 6CXM-GTE/GTE2 Manual
| System | Pages | Key Topics |
|---|---|---|
| Revision History List | 3 | Document Name, Product Name, Revision No., Revision Date, Reason for Revision, Revision Outline |
| For Safe Operation | 7-11 | Warning Symbols, Precautions for Safe Servicing, Tools to Be Used, Use of Genuine Parts, Oil and Grease, Bolt and Nut Tightening Torques, Handling of Product |
| Location for Product Safety Labels | 12 | Product Safety Labels, Parts Code Numbers, Danger, Warning |
| General | 13-20 | Exterior Views, Specifications, Performance Curve, Dimensions, Electric Wiring Diagram, Piping Diagram |
| Disassembly and Reassembly | 21-46 | Preparations Before Disassembly Abd Reassembly, Tools and Agent, Reassembly Procedures |
| Cylinder Head | 47-51 | - |
| Piston and Piston Pin | 52-55 | - |
| Connecting Rod | 56-63 | Cylinder Sleeve, Cylinder Block, Crankshaft and Main Bearing |
| Camshaft and Valve Gear | 64-69 | Timing Gear, Lube Oil System |
| Cooling Water System | 70-74 | - |
| Fuel Oil System | 75-112 | - |
| Electrical Equipment | 113-116 | - |
| Turbocharger | 117 | - |
| Periodic Inspection | 118 | Fuel Oil System, Engine Lube Oil System, Cooling Water System, Fuel Injection and Injection Valve, Cylinder Head, Turbocharger |
| Service Standard | 119-121 | Service Values, Adjustment Values, Check Values |
| Tightening Torque of Major Bolts and Nuts | 122 | Cylinder Head Installation Bolts, Connecting Rod Tightening Bolts, Flywheel Tightening Bolts, Main Bearing Installation Bolts, Taper Plug, Pipe Joint Bolt |
| Troubleshooting | 123-131 | Does Not Start or Difficult to Start, Unsmooth Running, Sudden Engine Stop, Poor Exhaust Gas Color, Insufficient Output, Ununiformity Output for Each Cylinder, Knocking |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Cylinder head installation bolts (final torque) | 245 ± 4.9 N·m (25 ± 0.5 kgf·m) | p. 50 |
| Connecting rod tightening bolts torque | 226 ± 4.9 N·m (23 ± 0.5 kgf·m) | p. 56 |
| Seawater pump rubber impeller part number | 128620-42200 | p. 70 |
| Fuel filter element replacement interval | Every 250 hours of use | p. 109 |
| Fuel filter element part number | 127695-55630 | p. 109 |
| Thermostat valve open temperature | 71°C ± 2 | p. 73 |
| Turbocharger shaft dia. at bearing (Standard dimension) | 12.192 - 12.200 mm | p. 117 |
| Lub.oil capacity (Max.) | 22 L | p. 110 |
| 6CXM-GTE | ||
| Max. rating (ISO3046-1), 6CXM-GTE | 342(465)/2850 kW(PS)/rpm | p. 14 |
| High idle/Low idle speed, 6CXM-GTE | 3200 ± 25 rpm | p. 14 |
| 6CXM-GTE2 | ||
| Max. rating (ISO3046-1), 6CXM-GTE2 | 357(485)/2900 kW(PS)/rpm | p. 14 |
| High idle/Low idle speed, 6CXM-GTE2 | 3250 ± 25 rpm | p. 14 |
Yanmar 6CXM-GTE, 6CXM-GTE2, 6CXM-GTE/GTE2 Common Problems This Manual Covers
Overheating from a worn seawater impeller
Raw water flow drops as the rubber impeller vanes wear or shed, and coolant temperature climbs under load. The manual's cooling water system coverage includes seawater pump servicing and identifies the rubber impeller by part number 128620-42200, plus the thermostat opening temperature of 71 degrees C plus or minus 2 for checking the fresh water side.
Manual Section: 3. Inspection and Servicing of Major Engine Parts p. 47Hard starting or no start
A 6CXM that cranks but will not fire usually comes down to fuel delivery, compression, or the starting circuit, and chasing it by swapping parts gets expensive fast. The troubleshooting chapter opens with a dedicated chart for does not start or difficult to start, working cause by cause to the fix.
Manual Section: 7. Troubleshooting p. 123Clogged fuel filters starving the engine
Dirty fuel shows up as surging, insufficient output, or a sudden stop. The manual sets the fuel filter element replacement at every 250 hours and gives the element part number 127695-55630, alongside the other fuel, lube oil, and cooling system intervals.
Manual Section: 4. Periodic Inspection p. 118Turbocharger wear and lag
Slow boost, oil in the compressor housing, or shaft play means the turbo needs measuring, not guessing. The turbocharger portion of the inspection section gives standard dimensions, including a shaft diameter at the bearing of 12.192 to 12.200 mm, so you can judge whether the cartridge is still serviceable.
Manual Section: 3. Inspection and Servicing of Major Engine Parts p. 47Reassembly with guessed torque figures
A made-up head bolt figure either crushes the gasket or lets it weep, and either way the head comes back off. The torque table covers cylinder head installation bolts, connecting rod bolts, flywheel bolts, and main bearing bolts in one place; the head bolt procedure itself is staged in three passes ending at 245 N.m.
Manual Section: 6. Tightening Torque of Major Bolts and Nuts p. 122Knocking or uneven output per cylinder
A knock or one weak cylinder points at injection, valve lash, or a mechanical fault, and the wrong guess can turn into a metallic banging that ends the engine. The troubleshooting chapter has separate charts for knocking and for ununiform output between cylinders to isolate the cause before it spreads.
Manual Section: 7. Troubleshooting p. 123Frequently Asked Questions
Which engines does this manual cover?
The Yanmar 6CXM-GTE and 6CXM-GTE2 marine diesel engines. It is Yanmar's own service manual, publication number M9961-H13021, 132 pages, in English. Specifications for both versions, including their different rated speeds, are given in the General section.
Does it include torque specs for the head and rod bolts?
Yes. The Tightening Torque of Major Bolts and Nuts section tables the cylinder head installation bolts, connecting rod bolts, flywheel bolts, and main bearing bolts. The reassembly procedures also give the staged tightening sequence for the head, three passes ending at 245 N.m, plus 226 N.m for the connecting rod caps. p. 122
Are wear limits and clearances listed for a rebuild?
Yes. The Service Standard section collects service values, adjustment values, and check values, and the Inspection and Servicing of Major Engine Parts section gives measuring procedures for the crankshaft, bearings, pistons, sleeves, valve gear, and turbocharger so you can judge each part against its limit. p. 119
Does it cover the cooling and fuel systems, not just the core engine?
Yes. The Inspection and Servicing section includes the lube oil system, cooling water system (seawater pump and impeller included), fuel oil system, electrical equipment, and turbocharger. The General section adds the electric wiring diagram and piping diagram. p. 47
How quickly can I access this manual?
Immediate download of the complete 132-page searchable Service Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Are there any print restrictions on this manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Can I trace circuits with this Yanmar 6CXM-GTE manual?
Yes, full electrical schematics are included with wire colors, connector locations, and circuit descriptions.
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