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guidebook

Parts Selection Guide

Find the parts you need

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Prop Selection Guide

Find the right prop for your boat

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      Mercruiser Gearcase & Drive Parts

      • Sierra 18-7115 O-Ring
        $1.99

        Sierra 18-7115 O-Ring Sierra replacement O-ring for marine engines. Width: 0.135" or 3.4mm I.D.: 1.735" or 44.1mm Package of 1 Interchangeable with: GLM 82240 Johnson/Evinrude Outboard 302588 Mercruiser Stern...

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      • Sierra 18-7156-9 O-Ring (Pkg Of 5)
        $14.99
        $11.49

        Sierra 18-7156-9 O-Ring (Pkg Of 5) Sierra replacement O-ring for Mercury, Mercruiser, Johnson/Evinrude, and OMC engines. I.D.: 1.185" or 30.1mm Width: 0.100" or 2.5mm Package of 5 Interchangeable with: GLM 81230 Johnson/Evinrude...

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      • Sierra 18-7175 O-Ring
        $6.99
        $5.49

        Sierra 18-7175 O-Ring Package of 5 O-Rings. I.D.: 3.750" or 95.3mm Width: 0.270" or 6.9mm Interchangeable with: GLM 88170 Mercruiser Stern Drive 25-62817

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      •  Sierra 18-7321-9 Bellows Clamp (Pkg Of 5)
        $12.49
        $9.49

        Sierra 18-7321-9 Mercruiser Bellows Clamp (Pkg Of 5) Sierra replacement bellows clamp for Mercruiser Stern Drives. Package of 5 Interchangeable with: GLM 21790 Mallory 9-73115 Mercruiser Stern...

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      • Sierra 18-7426-9 O-Ring (Priced Per Pkg Of 2)
        $3.49
        $2.99

        Sierra 18-7426-9 O-Ring (Priced Per Pkg Of 2) Sierra high-quality engine parts are designed to meet OEM specifications. For Mercury and Mercruiser engines. I.D.: 0.740" Width: 0.310" Interchangeable...

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      • Sierra Retainer Seal Kit 18-2469
        $100.49
        $75.49

        Sierra Retainer Seal Kit 18-2469 This Sierra Retainer Seal Kit has Sierra's guaranteed fitment, backed by their lifetime warranty. It has a direct application fitment that exceeds OEM quality.  Interchangeable with: Mercruiser Stern...

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      • Mercruiser 8M0147076 Bravo 3 Sterndrive 300 Hour Service Kit
        $745.63
        $621.36

        Mercruiser 8M0147076 Bravo 3 Sterndrive 300 Hour Service Kit This Mercruiser Bravo 3 Sterndrive 300 Hour Service Kit has everything needed to service your sterndrive in one convenient kit. For Bravo 3 sterndrives (2003 and Newer) Kit...

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      • Mercruiser 8M0147072 Alpha One Outdrive 300 HR Service Kit
        $563.92
        $469.93

        Mercruiser Alpha One Outdrive 300 Hour Service Kit This Mercruiser Alpha One Outdrive 300 Hour Service Kit has everything needed to service your outdrive in one convenient kit. For Alpha One Outdrives (1990-1994) Kit Includes: Drive Installation...

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      Mercruiser OEM Engine Parts Finder

      Mercruiser Gearcase

      Shims, yokes, and spools may throw your head in a whirl. Just the idea of “gearcase” is an intimidating one, especially for newer boaters and those just taking on the do-it-yourself route. You’ve made a wise choice with your Mercruiser engine, but are now hoping to perform preventative maintenance or repair a busted part. Wholesale Marine has all that you need for your Mercruiser gearcase for pre-Alpha, Alpha, and Bravo drives.

      Where to Begin?

      Whether a pro boater or a casual weekend cruiser, your Mercruiser gearcase needs attention from time to time. The delicate intricacies of the gearcase are not to be taken lightly, and we recommend referring to your engine’s manual, manufacturer’s website, or a number of other resources as you diagnose or update your boat’s engine. Once you know what you are looking for, we strive to make it as easy as possible to locate it, beginning with our Parts Selection Guide. We offer a wide array of Mercruiser gearcase components. Both upper and lower gear housing seal kits are offered, each one meeting OEM standards and including all that you need. Upper unit gears, shift spools, replacement drives, shims, O-rings, and seals make this an excellent comprehensive site for all of your Mercruiser gearcase needs.

      Whether an engine expert or a newer novice, we want to assist you in your Mercruiser gearcase journey. We have a highly-trained team full of experienced boaters who have been in your shoes and can help you choose the right part from the get-go. We are here Monday through Friday, 9:00 AM to 6:00 PM EST, at (877) 388-2628 to help you narrow down your search and select just the right part for the job. Our Captain’s Club loyalty rewards program, shipping perks, and price match guarantee are added bonuses to ensure each and every customers’ satisfaction