Yamaha Outboard Corrosion Resistance

Yamaha Outboard Corrosion Resistance


Ultimate Corrosion Resistance Ensuring the excellent durability of Yamaha Outboard Motors

One of the distinguishing qualities of Yamaha Outboard Motors is their renowned durability tried and proven in tough use in demanding conditions around the world for the past 60 years. That is why so many users in various conditions throughout the world depend on and love their Yamaha outboards; from sweltering tropical heat to extreme cold, high-salinity seawater, the thin air of high elevations, muddy freshwater and more. Of course, the experience and know-how gained over the years have fueled continuing improvements that are fully employed in today`s pleasure-use models as well. Here we introduce one of the important components of outboard durability, Yamaha`s high level of anti-corrosion measures and technology.




Yamaha`s exclusive high-standard corrosion testing


Yamaha outboard motors are the products of ongoing research and development efforts aimed at giving them the durability to handle the toughest use environments they will encounter all over the world. A good example of the conditions that test an outboard motor are tropical seas and their high water temperature. The resulting high rate of ion exchange in the saltwater plays a large part in the corrosion of aluminum. Air temperature, humidity, seawater temperature, salinity, dissolved oxygen levels, the amount of pollutants in the water and pH values (acidity/alkalinity) are some of the factors that highly influence corrosion rates. To verify the corrosion resistance of its outboards, Yamaha recreates the actual conditions of the use environments from different regions of the world with regard to these factors in testing its outboards. The unique evaluation standards used in these tests have been formulated based on more than half a century of experience and the results of exhaustive on-site market surveys in seawater and freshwater environments of the primarily pleasure-use markets of North America and Europe and the mainly utility-use markets of regions like Southeast Asia, Africa and South America, where outboards must often endure strenuous use in severe conditions.


Market monitor surveys Periodic market monitoring surveys are run in order to collect evaluations from actual users.
Cycle corrosion test evaluation Extensive corrosion testing is conducted with Yamaha-exclusive test devices/equipment that recreate severe use environments.
Salt spray test evaluation A number of outboard units are regularly chosen at random from production lots for post-production quality evaluation.






Yamaha`s Seven Corrosion Resistance Measures


Image of Yamaha`s Seven Corrosion Resistance Measures

In addition to these seven measures, Yamaha Outboard Motors are designed and engineered throughout to improve corrosion resistance through extensive research and reviews for the best parts materials, the optimum layout for each functioning device and more.



1.YDC-30: Proprietary Alloys

The main structural members of Yamaha outboards are die-cast using Yamaha`s exclusively developed "YDC-30" aluminum alloy. This alloy contains silicon, magnesium, titanium and other elements to give it a high level of corrosion resistance that dramatically increases the anti-corrosion performance in an outboard motor. Furthermore, in addition to the main structure, the parts used throughout the engine including each and every bolt are given special coatings to ensure the highest levels of corrosion resistance.

Image of YDC-30: Proprietary Alloys



2.Multi-layer Paint Process


Yamaha outboards are painted with an exclusive multi-layer painting process. An undercoating of oxidized Zr (zirconium) is applied, and then a coating of high-performance, environmentally friendly chrome-free primer is applied. This not only protects against saltwater corrosion but also against deterioration due to strong sunlight and ultraviolet rays.


Image of Multi-layer paint process
Image of Multi-layer paint process
Image of Multi-layer paint process



Image of Freshwater Flush Device

3.Freshwater Flush Device


Yamaha outboards are designed with a Freshwater Flushing Device that makes it possible to flush any saltwater out of the cooling passages with freshwater, without starting the engine. This exclusive Yamaha system heightens usability and makes it possible for the users themselves to greatly increase the life of their engine with a simple flushing operation.



4.Multiple Additional Sacrificial Anodes


Sacrificial anodes are used to draw corrosion away from the motor`s aluminum body components. In the engine, anodes are positioned particularly in the cooling water passages, on the cylinder block and in the exhaust system to prevent corrosion. The strategic positioning and specific design of these anodes has dramatically increased the anti-corrosion effect. Furthermore, larger anodes are placed in effective locations on the parts of the motor that get the most constant exposure to saltwater like the brackets and lower casing.


  • Image of Multiple Additional Sacrificial Anodes


  • Image of Multiple Additional Sacrificial Anodes



Image of Enhanced Head Gaskets

5.Enhanced Head Gaskets


Yamaha outboards are fitted with exclusively developed high-density, high-strength head gaskets. These gaskets create a reliable seal that prevents cooling water from entering the engine cylinders. Furthermore, they are shaped in a way that hinders the process of corrosion should water somehow get into the seal.



6.Anodized Exhaust System


To further heighten corrosion resistance, the exhaust guide and oil pan, as well as the other exhaust system components of the muffler, exhaust plate and pipe, are given an anodic oxide coating with its excellent anti-corrosion, anti-abrasion qualities.



7.Special Paint Process


An electrodeposition coating process is used for both the inside and out of the powerhead on a Yamaha outboard. Compared to conventional spray-painting methods, this method ensures a more thorough coating into all the smallest crevices of the powerhead, ensuring more complete corrosion prevention. The electrodeposition method is also used to coat the internal surfaces of the muffler and exhaust plate for more effective corrosion resistance.


Image of Special Paint Process




Yamaha Outboard Corrosion Resistance

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