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6H3-11111-01 6H3-11111-01-1S 6H3-11111-02-1S 6H3-11111-00
PREMARINE
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1. Technical Specifications
| Parameter | Specification / Detail |
| Component Type | Outboard Engine Cylinder Head (Head, Cylinder 1) |
| OEM & Interchange Part Numbers | 6H3-11111-01-1S / 6H3-11111-01 / 6H3-11111-02-1S / 6H3-11111-00 |
| Engine Configuration | Inline-3, 2-Stroke Marine Outboard Engines (849cc 6H3 platform) |
| Horsepower Range | Yamaha 60HP & 70HP 2-Stroke Models (60F, 70B, E60H, etc.) |
| Spark Plug Ports | 3-Cylinder standard M14 threaded spark plug ports |
| Color & Coating | Yamaha 1S / 8D Dark Bluish Gray / Silver Metallic baked marine finish |
| Material Composition | Marine-grade low-copper die-cast aluminum alloy with high thermal conductivity |
2. Key Features
High Thermal Conductivity & Corrosion Resistance: Cast from premium low-copper aluminum alloy to provide superior heat dissipation and resist galvanic corrosion inside raw seawater cooling passages.
Precision CNC Combustion Chambers: Hemispherical combustion domes are precision machined for balanced chamber volumes, delivering uniform compression ratios and smooth 3-cylinder engine balance.
Optimized Cooling Water Jacket Flow: Engineered coolant jacket passages eliminate hot spots, ensuring rapid thermal transfer away from spark plug bosses to prevent engine knocking and scuffing.
Direct OEM Fitment: Cylinder head bolt patterns, cooling water cover mating surfaces, thermo-switch bosses, and spark plug threads conform strictly to factory drawings for seamless installation.
3. Compatible Models
Primarily compatible with Yamaha 3-cylinder 2-stroke 849cc outboards built on the 6H3 platform:
Yamaha 60 HP 2-Stroke Series: 60F, 60FED, 60FET, 60TLR, E60H
Yamaha 70 HP 2-Stroke Series: 70B, 70BED, 70BET, 70TLR, 70TR
Outboard Clones: Compatible with Parsun (T60/T70), Hidea (HD60/HD70), Powertec, and other outboards based on the Yamaha 6H3 powerhead architecture
4. Aftermarket & Brand Compatibility
OEM Brand Fitment:
Yamaha Marine: Designed for genuine Yamaha 60HP and 70HP 2-stroke powerhead combustion and cooling systems.
PREMARINE Brand Aftermarket Replacement:
PREMARINE Quality Standard: PREMARINE specializes in high-reliability marine powerhead castings, cylinder heads, exhaust covers, and engine overhaul components. This cylinder head is manufactured using high-pressure vacuum die-casting and precision CNC machining.
Direct OEM-Level Performance: Deck flatness, combustion volume consistency, and corrosion endurance meet or exceed OEM specifications, serving as the premier cost-effective choice for major engine overhauls.
5. Common Symptoms & Troubleshooting
Engine Overheating, Low Compression, or External Head Gasket Seepage:
Cause: Severe thermal warpage of the cylinder head deck failing to clamp the head gasket uniformly.
Troubleshooting: Remove the head and inspect deck flatness using a precision straight edge and feeler gauge; replace the cylinder head if warpage exceeds service limits.
Severe Salt Pitting, Water Jacket Corrosion, or Pinholes into Combustion Chamber:
Cause: Prolonged saltwater operation without routine freshwater flushing, leading to galvanic oxidation perforating internal casting walls.
Troubleshooting: Inspect internal water cooling chambers for heavy calcium/salt crusting and wall erosion; replace corroded heads immediately.
Stripped Spark Plug Threads:
Cause: Cross-threading or excessive tightening torque on spark plugs damaging the aluminum threads.
Troubleshooting: Inspect spark plug thread integrity; replace the cylinder head assembly if threads cannot safely hold specified torque.
OEM Part Numbers
Compatible OEM references include:
6H3-11111-01
6H3-11111-01-1S
6H3-11111-02-1S
6H3-11111-00
Compatible Engine Models
This Cylinder Head is primarily designed for:
2-Stroke 60/70HP
If you are unsure about compatibility, please provide your engine model number or identification plate for verification before ordering.
Applications
This Cylinder Head is commonly used for:
Outboard engine repair
Engine rebuilding projects
Marine maintenance workshops
Boat fleet maintenance
Commercial fishing vessels
Recreational boats
Marine spare parts distribution
