Sierra Engine Parts Your headquarters for over 1,100 quality replacement parts for most popular marine powerplants! The complete source of quality engine replacement parts from the leader in the field: Sierra. Our distribution centers stock a huge selection of parts so we can deliver the parts you need quickly even overnight! Our conveniently located stores across the country have the most frequently needed tune-up and repair kits in stock. For help determining the correct parts, or to order the exact replacement parts you need, call our toll-free number 1-800-BOATING (1-800-262-8464).