{"product_id":"mercury-mercruiser-seacore-port-trim-cylinder-assembly-8m0128692-bravo","title":"Mercury MerCruiser SeaCore Port Trim Cylinder Assembly — OEM 8M0128692 | Bravo One, Two, Three","description":"\u003ch2\u003eMercury MerCruiser SeaCore Port Trim Cylinder Assembly — OEM 8M0128692 | Bravo One, Two, Three\u003c\/h2\u003e\u003cp\u003eThis genuine OEM port-side power-trim cylinder is the SeaCore-configuration replacement for selected MerCruiser Bravo sterndrives. It works together with the starboard cylinder to raise, lower, and hold the sterndrive at the correct trim angle under hydraulic pressure. If the port side of your Bravo trim system is leaking, won’t hold trim position, or has a damaged rod or cylinder body, 8M0128692 is the OEM replacement — but confirming the SeaCore configuration is critical before ordering, as standard Bravo drives use a different port-side cylinder.\u003c\/p\u003e\u003ch2\u003ePart Information\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e 8M0128692\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mercury \/ MerCruiser\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOfficial Product Type:\u003c\/strong\u003e Port hydraulic power-trim cylinder assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e SeaCore\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Port (left side)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatching Starboard Cylinder:\u003c\/strong\u003e \u003ca href=\"\/products\/mercury-mercruiser-seacore-starboard-trim-cylinder-assembly-oem-8m0128693-bravo-one-two-three\"\u003e8M0128693\u003c\/a\u003e (SeaCore starboard side)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Hydraulic power-trim system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e One port cylinder per trim assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN \/ UPC:\u003c\/strong\u003e Not on file — verify at time of order\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser Bravo One — SeaCore trim-cylinder configuration\u003c\/li\u003e\n\u003cli\u003eMerCruiser Bravo Two — SeaCore trim-cylinder configuration\u003c\/li\u003e\n\u003cli\u003eMerCruiser Bravo Three — SeaCore trim-cylinder configuration\u003c\/li\u003e\n\u003cli\u003eMerCruiser Bravo X One \/ Two \/ Three — SeaCore configuration\u003c\/li\u003e\n\u003cli\u003eMerCruiser Bravo XR One \/ Three — SeaCore configuration\u003c\/li\u003e\n\u003cli\u003eMerCruiser Bravo XR SportMaster — SeaCore configuration\u003c\/li\u003e\n\u003cli\u003eSelected high-performance and integrated transom applications using this SeaCore port cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImportant:\u003c\/strong\u003e Confirm the drive model, transom assembly, and trim-cylinder configuration before ordering — standard (non-SeaCore) Bravo drives use a different port trim cylinder\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eRelated Parts\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/mercury-mercruiser-seacore-starboard-trim-cylinder-assembly-oem-8m0128693-bravo-one-two-three\"\u003eMercury MerCruiser SeaCore Starboard Trim Cylinder Assembly — 8M0128693\u003c\/a\u003e (matching starboard cylinder)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/mercury-mercruiser-quicksilver-bravo-trim-cylinder-assy-starboard-8m0132610\"\u003eMercury MerCruiser Bravo Trim Cylinder Assembly Starboard — 8M0132610\u003c\/a\u003e (standard non-SeaCore starboard reference)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhen to Replace\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHydraulic fluid leaking from the cylinder body, rod seal, or fitting connections\u003c\/li\u003e\n\u003cli\u003eSterndrive will not hold trim position and diagnosis points to the port cylinder\u003c\/li\u003e\n\u003cli\u003eCylinder rod is bent, scored, or corroded beyond service limits\u003c\/li\u003e\n\u003cli\u003eCylinder body is cracked or physically damaged\u003c\/li\u003e\n\u003cli\u003eInternal cylinder wear causing erratic or weak trim operation on the port side\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eInspect hydraulic hoses, fittings, mounting pins, anodes, and mating hardware while the cylinder is removed\u003c\/li\u003e\n\u003cli\u003eReplace hoses and seals as needed rather than reusing worn components\u003c\/li\u003e\n\u003cli\u003eFollow the applicable Mercury service procedure for cylinder installation and hydraulic-system bleeding\u003c\/li\u003e\n\u003cli\u003eVerify smooth, full-range trim operation on both port and starboard sides and check for fluid leakage before returning the drive to service\u003c\/li\u003e\n\u003cli\u003eTorque all hydraulic fittings to Mercury specification to prevent leaks under pressure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical FAQ\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the SeaCore and standard port trim cylinder?\u003c\/strong\u003e\u003cbr\u003eSeaCore trim cylinders are built with a corrosion-protection package for saltwater environments, including specific cylinder materials and coatings. Standard Bravo drives use a different port-side cylinder. The two configurations are not interchangeable — always confirm whether your transom assembly is SeaCore or standard before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I replace both port and starboard cylinders at the same time?\u003c\/strong\u003e\u003cbr\u003eIt is strongly recommended. If one cylinder is leaking or failing, the other has experienced the same service hours and conditions. Replacing both together during the same service visit avoids a repeat job and ensures balanced trim performance. The matching starboard cylinder is \u003ca href=\"\/products\/mercury-mercruiser-seacore-starboard-trim-cylinder-assembly-oem-8m0128693-bravo-one-two-three\"\u003e8M0128693\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I confirm this is the correct cylinder for my drive?\u003c\/strong\u003e\u003cbr\u003eThe most reliable method is to match the existing cylinder’s part number or check the transom assembly number against Mercury’s parts catalog. Drive model alone (e.g., Bravo Three) is not sufficient, because both SeaCore and standard cylinders are listed for the same drive families.\u003c\/p\u003e\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\u003cp\u003ePort and starboard trim cylinders on Bravo drives almost always need to be replaced together — if a customer comes in for one cylinder, the recommendation should always be to do both sides. The SeaCore vs. standard configuration mix-up is the most common ordering error on Bravo trim cylinders, and it’s easy to make because the drive model names are the same across both configurations. The safest confirmation is the existing cylinder part number. Browse the full \u003ca href=\"\/collections\/mercruiser-marine-engine-parts\"\u003eMerCruiser Marine Engine Parts\u003c\/a\u003e collection for related sterndrive and trim components.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":51324693938212,"sku":"8M0128692","price":1136.24,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/39dbb344-ea2c-4713-945f-9edc05bface6_6d55f661-7526-49eb-843f-ce958c06337f.png?v=1788215744","url":"https:\/\/marisolmarine.com\/products\/mercury-mercruiser-seacore-port-trim-cylinder-assembly-8m0128692-bravo","provider":"Marisol Marine Company","version":"1.0","type":"link"}