Mercury Runs Circles Around Aftermarket

This photo shows aftermarket gears, used in an aftermarket engine, after only 50 hours of use. Since manufacturers of aftermarket products are not required to do any testing, this gear failure may not be found until after the engine's been installed in your boat.

When it comes to replacing part of your engine, or repowering your boat, there are really only two options available: genuine Mercury Marine engines and components – or aftermarket.

Mercury Marine is the most-recognized name in the marine industry – because this is what we do. For more than 70 years, Mercury has stood for reliability and durability; it is the name you can trust. Our products are designed and built to rigid specifications, and are built to last. All of the parts and components are made to work together – whether for new engines or for remanufactured products. In fact, the parts we use when remanufacturing our engines and components are the same as those used in the factory to make new products. Mercury Remanufacturing products are examined, rebuilt and tested by Mercury employees. We stand behind our products, and all remanufactured engines and components come with a standard limited warranty, and are also eligible for extended factory-backed coverage plans.

When you take a risk by buying aftermarket products, what you see may not always be what you get. Aftermarket engines and components could be built from other aftermarket parts. The parts may not be designed to work together, may not be marine-grade, and may not even be able to withstand the rigors and high RPMs of boating.

The old adage "You get what you pay for" still proves true today. What may appear to be up-front savings may cost you more in future repairs. So whether you're repowering your boat or repairing your engine, be sure to use genuine Mercury Remanufacturing products.

See examples of what sets Mercury products apart:

Aftermarket Competitor’s Shaft & Yoke:

  1. Inside diameter of hole is too large and will cause noisy U-joint and premature failure.
  2. Center-line of holes is not true and will cause excessive vibration.
  3. Spline diameter is too small so gear will fit loose and cause premature gear wear.
  4. Threads are not pitched correctly – threads could strip and nut will not remain torqued.

Twisted splines on competitor’s aftermarket driveshaft


  • Utilizing forged gear blanks and higher quality steel rather than less expensive bar stock ensures added strength, reliability and durability.
  • Gears are shot peened to increase gear tooth strength.
  • Mercury precisely duplicates gear geometry to ensure long gear life.