Sierra Marine Engine Parts & Drive Parts   Sierra Marine is a trusted name in aftermarket replacement boat engine and drive parts. Sierra’s products are designed and engineered to exceed the high horsepower demands of today’s engines in the harshest marine environments. All Sierra products meet or exceed the original equipment part it replaces.   If you need help finding a part, we need, Make, Model, Year, Horsepower, and Serial number of your engine.   Warning: We can no longer ship engine parts International or to California Due to Prop 65.

Water tube guides for Mercury and Mercruiser.

Recommended for low to high horsepower under regular use. May be used in freshwater and occasionally in saltwater. Use with aluminum and stainless propellers.

Recommended for low to high horsepower under regular use. May be used in freshwater and occasionally in saltwater. Use with aluminum and stainless propellers.

Sierra water pump kits Mercury and Mariner outboard engines. Kit contents based on application.

Sierra water pump kits Mercury and Mariner outboard engines. Kit contents based on application.

Sierra water pump kits Mercury and Mariner outboard engines. Kit contents based on application.

The Environmental Protection Agency published a final rule aimed at reducing exhaust emissions from diesel-powered recreational boats.   The National Marine Manufacturers Association says the rule helps the marine industry avoid “a series of very detrimental after treatment catalyst-based standards.”   As originally proposed, the rule, “Control of Emissions of Air Pollution from Locomotive Engines and Marine Compression Ignition Engines Less Than 30 Liters Per Cylinder,” would have required U.S.-flagged recreational marine diesel-powered vessels with engines greater than 2000 kW to install catalyst after treatment systems.   “This rule had the potential to very severely impact recreational yacht builders,” said John McKnight, the NMMA director of environmental safety and compliance, in a statement. “Once a rule like this gets on the books and the technology is required, it could spread to all vessels operated within U.S. waters, regardless of horsepower or where the vessel is flagged.”   A diesel catalyst system requires urea, a chemical made from ammonia and carbon dioxide and low-sulfur fuel. Urea is not necessarily suitable for storage on a recreational yacht, nor is it widely available, according to McKnight. He says the lack of availability of urea ultra-low sulfur fuel in many foreign ports that luxury yachts frequent could have severely compromised the value of U.S.-flagged vessels.   “The major flaw in EPA's proposal was that the rule only applied to U.S. flagged vessels,” McKnight said. “We were able to convince the agency that the rule, as proposed, would only encourage more yacht owners to flag their vessels outside the U.S.”   In the final rule, the EPA exempted recreational yachts from Tier IV catalyst-based standards. The final rule instead requires engine manufacturers to meet the more stringent Tier III requirements; however, McKnight says this requirement will be transparent to yacht builders.   Despite this key regulatory accomplishment, McKnight warns yacht manufacturers to remain cautious.   The International Marine Organization's Marine Protection Committee released a proposal April 4 requiring aftertreatment on all recreational and commercial diesel marine engines greater than 750 hp. The NMMA is working with the ICOMIA Marine Engine Committee and the European Association of Internal Combustion Engine Manufacturers to oppose this proposal.   IMO would only require a recreational yacht traveling to ports within countries that signed a treaty with the organization to be equipped with aftertreatment; however, the significance of the proposal is that countries that have signed IMO treaties encompass a majority of the well-traveled world.   To date, the United States has not signed a treaty with IMO. If, however, the proposed IMO rule is finalized as is, the EPA is expected to move quickly to adopt aftertreatment standards.   For information about the latest EPA rule or the IMO proposal, contact John McKnight at (202) 737-9757 or jmcknight@nmma.org.

Water tube guides for Mercury and Mercruiser.

Sierra water pump repair kits with upper housing for Mercury outboards.

Water tube guides for Mercury and Mercruiser.

Chesapeake Black 2" Trim Gauge (Mercury / Mariner / Mercruiser / Volvo DP / Yamaha '01 and newer) Perimeter-lighted Black dial with stylish Blue and White graphics, polished stainless steel bezel, contoured White pointer and domed glass lens. 2"- Hole Size: 2.0625" (53mm) For Engine Types: (Mercury / Mariner / Mercruiser / Volvo DP / Yamaha '01 and newer) Specifications: Anti-scratch glass lens Perimeter lighted back light 12 VDC negative ground Can be adapted for 24 VDC systems Factory P/N GP9402 *Sold as an Individual **Gauge Cover not Included This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.

Chesapeake White SS 2" Trim Gauge (Mercury / Mariner / Mercruiser / Volvo DP / Yamaha - '01 and Newer) Perimeter-lighted White dial with stylish Blue and White graphics, polished stainless steel bezel, contoured White pointer and domed glass lens. 2"- Hole Size: 2.0625" (53mm) For Engine Types: (Mercury / Mariner / Mercruiser / Volvo DP / Yamaha-2001 and newer) Specifications: Anti-scratch glass lens Plastic Cases for corrosion resistance and long life 12 VDC negative ground Can be adapted for 24 VDC systems Factory P/N GP9649 *Sold as an Individual **Gauge Cover not Included This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.

Dress White 2" Trim Gauge (Mercury / Mariner / Mercruiser / Volvo DP / Yamaha '01 and newer)  Perimeter-lighted White dial with bold Black graphics, White aluminum bezel, contoured Black pointer and flat glass lens. 2"- Hole Size: 2.0625" (53mm) For Engine Types: (Mercury / Mariner / Mercruiser / Volvo DP / Yamaha '01 and newer) Specifications: Anti-scratch glass lens 12 VDC negative ground Can be adapted for 24 VDC systems Factory P/N GP9712 *Sold as an Individual *Gauge Cover not Included This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.

Euro Black 2" Trim Gauge f/ Mercury/Mariner/Mercruiser/Volvo DP/Yamaha '01 and Newer Perimeter-lighted Black dial with bold White graphics, Black aluminum bezel, contoured White pointer and flat glass lens.  2"- Hole Size: 2.0625" (53mm) For Engine Types: Mercury / Mariner / Mercruiser / Volvo DP / Yamaha '01 and Newer Specifications: Anti-scratch glass lens 12 VDC negative ground Perimeter-lighted Black dial Can be adapted for 24 VDC systems Factory P/N GP9374 *Sold as an Individual **Gauge Cover not Included This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.