Mercury 175hp Industrial Marine Propulsion System — V6, 131kW, SmartCraft, 2-Yr Military Warranty

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Diesel Outboards

Mercury 175hp

Propshaft Rated Horsepower 175
• Kilowatts (kW) 131
Max RPM at Full Throttle 5000-6000
Cylinders/Engine Configuration V-6 (60-Degree Vee)
Displacement
• Cubic Inches (CID) 186
• Liters (L) 3
• Cubic Centimeters (cc) 3,046
Bore & Stroke
• Inches (in.) 3.63 x 3.00
• Millimeters (mm) 92.1 x 76.2
Induction System Crankcase Reed Induction
Fuel System Computer Controlled
2-Stage Direct Fuel Injection
Fuel Requirements Ultra Low Sulfur #2 Diesel
(15 PPM Max)
Ignition System Digital Multi-Strike
Charging System Fully Regulated Belt Driven
60-Amp (756 Watt)
Exhaust System Through Prop
Cooling System Water Cooled with Thermostat
& Pressure Controlled
Fuel/Oil Ratio Electronic Multipoint
Oil Requirement Mercury Premium Plus
2-Stroke Oil
Engine Management System SmartCraft
Gear Shift F-N-R
Gear Ratio 2:1 (FM)
Driveshaft Length 25" (XL, CXL)
Counter Rotation Available
Dry Weight (lbs./kg)1 517/235
Warranty 2-Year Limited Warranty for
Military Agencies

Description

Mercury 175hp manufacture

INTRODUCING THE OPTIMAX DIESEL,a second engine in Mercury Racing’s arsenal of “stealth” outboards. Developed for the U.S. Department of Defense (DoD), this exclusive spark ignited, direct fuel injected 2-stroke runs on ultra-low sulfur diesel fuel which is readily available around the globe. The 3.0 Liter V-6 Diesel, which produces 175 propshaft horsepower, shares 95% of its components with the gasoline engine it was derived from. And, with only a handful of unique parts, there are minimal training requirements necessary for maintenance.
 
INDUSTRY EXCLUSIVE DIRECT FUEL INJECTED - SPARK IGNITED DIESEL A two-stage direct-injection system uses a small charge of compressed air to finely atomize the diesel fuel as it injects it into the combustion chamber. Atomizing the fuel into a fine mist allows for ignition via spark to occur while delivering enhanced high rpm running quality. A glow plug works in concert with the spark plug for improved cold weather starting and idle quality
 
An on board Propulsion Control Module (PCM) microprocessor optimizes fuel and spark timing for improved running quality and performance throughout the engine's operating range. SmartCraft® Engine Guardian provides real-time, self-protection engine fault diagnostics and messaging.
 
Mercury Racing® OptiMax Diesel outboards are available with a 25” (635 mm) center section and the 2:1 Fleet Master gearcase in both right-hand and left-hand rotation.
 
KEY FEATURES
 
Mercury 175hp supplier
 
Industry exclusive spark ignited diesel engine. Glow plug ensures consistent, reliable cold starting.
• Mercury Racing cylinder heads designed specifically for combusting diesel fuel.
• High performance cylinder liners for maximum horsepower and optimal engine running quality.
• Fuel/air mixture is injected into the combustion chamber at 95 psi (15 psi higher fuel/air differential than standard OptiMax product) for enhanced high rpm running quality.
• Custom calibrated Propulsion Control Module (PCM) microprocessor optimizes fuel and spark timing for enhanced running quality and performance.
• SmartCraft Engine Guardian provides real-time, self protection engine fault diagnostics and messaging.
• Electronic multipoint lubrication system delivers precise amounts of oil where and when it’s needed.
• Multi-strike ignition coils fire spark plugs up to seven times per revolution for a complete fuel burn, eliminating any chance of misfire.
• The 60-amp, belt-driven alternator is the most powerful in its class.
• Acoustically tuned foam cowling wrap and new exhaust bucket design results in quieter engine sound throughout the operating range.
• Stealthy tone-on-tone graphics featuring the new Mercury Racing word mark.
 
OPTIMAX® DIESEL SPECIFICATIONS
 
Propshaft Rated Horsepower 175
• Kilowatts (kW) 131
Max RPM at Full Throttle 5000-6000
Cylinders/Engine Configuration V-6 (60-Degree Vee)
Displacement
• Cubic Inches (CID) 186
• Liters (L) 3
• Cubic Centimeters (cc) 3,046
Bore & Stroke
• Inches (in.) 3.63 x 3.00
• Millimeters (mm) 92.1 x 76.2
Induction System Crankcase Reed Induction
Fuel System Computer Controlled
2-Stage Direct Fuel Injection
Fuel Requirements Ultra Low Sulfur #2 Diesel
(15 PPM Max)
Ignition System Digital Multi-Strike
Charging System Fully Regulated Belt Driven
60-Amp (756 Watt)
Exhaust System Through Prop
Cooling System Water Cooled with Thermostat
& Pressure Controlled
Fuel/Oil Ratio Electronic Multipoint
Oil Requirement Mercury Premium Plus
2-Stroke Oil
Engine Management System SmartCraft
Gear Shift F-N-R
Gear Ratio 2:1 (FM)
Driveshaft Length 25" (XL, CXL)
Counter Rotation Available
Dry Weight (lbs./kg)1 517/235
Warranty 2-Year Limited Warranty for
Military Agencies
 
PART # MC 2557 ©2015 MERCURY MARINE All Rights Reserved. Reproduction in whole or in part without permission is prohibited. All models and specifications are subject to change without notice or without incurring obligations to modify previously manufactured products. The OptiMax Diesel outboard is not EPA certified and and not available for recreational markets. All trademarks belong to Brunswick Corporation.

About Mercury Marine

Mercury Marine is a globally recognized marine propulsion brand headquartered in the United States, with a history spanning more than 80 years. As one of the most influential names in the marine industry, Mercury has built its reputation through continuous innovation, engineering excellence, and a strong commitment to product reliability.

From recreational boating to commercial and professional marine applications, Mercury designs and manufactures engines and related systems that are tested under demanding real-world conditions. Each product is developed to meet strict performance and durability standards, ensuring stable operation in diverse marine environments. Through long-term investment in research and development, Mercury continues to refine its technologies to improve efficiency, safety, and user experience.

Today, Mercury Marine products are widely used across global markets and supported by an extensive network of authorized distributors and service providers. This global presence ensures that customers receive consistent product quality, technical support, and after-sales service throughout the entire lifecycle of their equipment.

The Importance of Choosing Genuine Mercury Parts

Choosing genuine Mercury parts is essential for maintaining the performance, reliability, and safety of a marine propulsion system. Original parts are engineered in accordance with Mercury’s technical specifications, ensuring precise compatibility with the engine and related onboard systems.

In marine environments, even minor differences in component design or tolerance can lead to accelerated wear, reduced efficiency, or unpredictable system behavior. Genuine Mercury parts help minimize these risks by maintaining consistent quality standards and reliable performance characteristics. They are designed to integrate seamlessly with Mercury engines, supporting stable operation under a wide range of conditions.

In addition to performance benefits, using original parts supports long-term system protection. Properly matched components help reduce unnecessary stress on critical systems, simplify maintenance procedures, and contribute to extended service life. This approach provides users with greater confidence during daily operation while also helping preserve the overall value of their equipment.

Why Purchase from Us

As an authorized first-tier Mercury distributor in China, we provide customers with direct access to genuine Mercury products and reliable professional support. With 28 years of experience in the marine industry, we have developed extensive expertise in Mercury systems as well as a deep understanding of local market requirements.

Our long-standing partnership with Mercury allows us to ensure stable product supply, accurate technical information, and compliance with official brand standards. Over nearly three decades, we have served customers across recreational, commercial, and professional sectors, building strong relationships based on trust, consistency, and service quality.

By purchasing through us, customers benefit not only from authentic products, but also from professional consultation, dependable logistics, and long-term after-sales support. We are committed to providing a complete purchasing and ownership experience that aligns with Mercury’s global standards.

Mercury-Certified Technical Support and After-Sales Service

We are supported by a team of Mercury-certified technical engineers who have received official training and certification from Mercury Marine. All installation, maintenance, and after-sales services are provided strictly in accordance with Mercury’s official technical requirements and service guidelines.

Our technical team follows standardized service procedures to ensure accurate diagnostics, proper installation, and reliable maintenance support. This professional approach helps maintain system integrity, reduce operational risks, and ensure consistent performance throughout the service lifecycle.

By delivering after-sales service that aligns with Mercury’s global standards, we help customers maintain long-term confidence in their equipment. From technical consultation to ongoing maintenance support, our goal is to provide professional, transparent, and dependable service throughout the entire ownership experience.

FAQ

Q: What is the minimum order quantity (MOQ) and lead time for international orders?​

A: ​​MOQ:​​ Flexible, from single units to bulk orders. ​​Lead time:​​ In-stock parts ship within 24H (excluding holidays).

​Q: Are your Mercury Marine parts genuine?​

A: Yes. All parts are ​​100% authentic Mercury Marine components​​, with original packaging, anti-counterfeit labels, and traceable part numbers.

​Q: How can I confirm if a part is compatible with my engine?​

A: Provide the ​​engine’s serial/model number​​ from the nameplate. Our technical engineers will verify compatibility for you.

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