{"product_id":"8m0156116-genuine-mercury-mercruiser®-steering-cylinder-power","title":"8M0156116 | Genuine Mercury Mercruiser® Steering Cylinder Power","description":"\u003cp\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e Steering Cylinder Power\u003cbr\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003cbr\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e Mercury Mercruiser\u003cbr\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 8M0156116\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVehicle Fitment\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp\u003e\u003cb\u003eCompatible Engines \u0026amp; Drives\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003ePart number is designed for marine applications featuring power-assisted steering systems:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eMerCruiser Alpha One® (Gen II) \u0026amp; Bravo® Series Drives:\u003c\/b\u003e Bravo One, Bravo Two, Bravo Three sterndrives.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eMerCruiser Gas Engines:\u003c\/b\u003e 3.0L, 4.3L V6, 5.0L V8, 5.7L (350 MAG), 6.2L, 7.4L, and 8.2L MAG engines equipped with hydraulic power steering.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eMerCruiser Diesel Engines:\u003c\/b\u003e Select QSD, CMD, and D-Tronic marine diesel platforms.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eMercury Inboards:\u003c\/b\u003e Select inboard gasoline and diesel engines with transom-mounted steering actuator hardware.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cb\u003ePower Steering Cylinder Assembly \u003c\/b\u003eis an OEM hydraulic actuator mounted inside the boat's transom assembly. It transforms hydraulic pressure from the engine's power steering pump into mechanical force to turn the outdrive or rudder effortlessly.\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cb\u003e1. What is it?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003ePart \u003cb\u003e8M0063382\u003c\/b\u003e is a heavy-duty hydraulic cylinder (steering actuator) that mounts on the inner transom plate of MerCruiser sterndrive engines. It links the mechanical steering cable coming from the helm to the outdrive's steering arm, acting as the power-assist interface for the vessel.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e2. Core Functions \u0026amp; Features\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eHydraulic Power Assist:\u003c\/b\u003e Uses pressurized hydraulic fluid from the power steering pump to reduce steering effort at the wheel, especially during tight maneuvers or at high speeds.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eAbsorbs Propeller Torque:\u003c\/b\u003e Neutralizes feedback forces generated by the spinning propeller (propeller torque steer) so the helm stays stable and smooth.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCable-to-Hydraulic Conversion:\u003c\/b\u003e Features an integrated control valve spool that senses movement from the manual mechanical steering cable and immediately directs hydraulic pressure to move the outdrive in the desired direction.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCorrosion Protection:\u003c\/b\u003e Built with marine-grade materials and seals designed to withstand harsh marine environments (both freshwater and saltwater).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSigns of Faulty \u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp\u003e\u003cb\u003e1. Heavy or Stiff Steering Wheel Effort\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSymptom:\u003c\/b\u003e The steering wheel becomes extremely hard to turn, particularly at low speeds or when idling into a slip, feeling as if the boat lacks power steering entirely.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCause:\u003c\/b\u003e Internal piston seals are torn or bypass fluid, preventing hydraulic pressure from building up inside the cylinder chambers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003e2. Hydraulic Fluid Leaking into the Engine Bilge\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSymptom:\u003c\/b\u003e Bright red or clear power steering fluid pools under the inner transom plate or drips down the steering ram. You may also notice fluid levels dropping rapidly in the power steering pump reservoir.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCause:\u003c\/b\u003e Blown rod seals, corroded cylinder shafts, or failed high-pressure hydraulic hose connections at the cylinder body.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003e3. Excessive \"Wander\" or Loose Steering Play (Slop)\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSymptom:\u003c\/b\u003e The boat strays off course, requiring constant steering correction at the helm, or there is noticeable free-play in the outdrive before the boat responds.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCause:\u003c\/b\u003e Mechanical wear in the cylinder’s internal spool control valve, worn guide bushings, or play in the cable coupler attachment pin.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003e4. \"Jerky\" or Hesitant Steering Response\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSymptom:\u003c\/b\u003e The outdrive stutters, vibrates, or catches abruptly when turning the steering wheel from side to side under acceleration.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCause:\u003c\/b\u003e Air trapped in the hydraulic circuit due to seal failure, or sticky control valve shuttle movement inside the actuator head.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003e5. Strong \"Propeller Torque\" Pull to One Side\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSymptom:\u003c\/b\u003e The helm forcefully pulls in one direction when cruising, requiring constant physical force to keep the boat running straight.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCause:\u003c\/b\u003e The internal directional spool valve inside the cylinder assembly has failed or is binding, causing uneven hydraulic assistance to one side.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer information\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMercury Marine\u003c\/strong\u003e is a marine engine division of Brunswick Corporation headquartered in Fond du Lac, Wisconsin. The main product line is outboard engines. It also produces the MerCruiser line of sterndrives and inboard engines. Some manufacturing is in Fond du Lac, while 40-60 HP engines are made in China. Smaller engines are Tohatsus that have been rebadged.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eFirst Truck Parts offers a\u003cstrong\u003e 365-days warranty\u003c\/strong\u003e for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website\u003c\/p\u003e","brand":"Mercury Marine®","offers":[{"title":"Default Title","offer_id":45851688108276,"sku":"8M0156116","price":1089.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/1479\/5764\/files\/s-l1600_5_18a61b94-a725-4496-b45a-436c6f6d2f17.webp?v=1729120178","url":"https:\/\/firsttruckparts.com\/products\/8m0156116-genuine-mercury-mercruiser%c2%ae-steering-cylinder-power","provider":"First Truck Parts","version":"1.0","type":"link"}