{"product_id":"merc-1316","title":"Mercury Quicksilver — Water Pump Impeller Washer — 8M0204722","description":"\u003ch2\u003eMercury Quicksilver Water Pump Impeller Washer 8M0204722\u003c\/h2\u003e\n\u003cp\u003eMercury Quicksilver 8M0204722 is a genuine OEM washer used in Mercury outboard water-pump and gear-housing assemblies. It is installed in the water-pump stack around the impeller and drive key and replaces earlier Mercury part number 8M0027721.\u003c\/p\u003e\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMercury 30 HP two-cylinder two-stroke outboards\u003c\/li\u003e\n\u003cli\u003eMercury 40 HP two-cylinder two-stroke outboards\u003c\/li\u003e\n\u003cli\u003eMercury 40 HP three-cylinder two-stroke outboards\u003c\/li\u003e\n\u003cli\u003eAdditional Mercury gear housings whose water-pump diagram specifies 8M0204722 or superseded 8M0027721\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSerial-number fitment:\u003c\/strong\u003e Confirm the engine serial number and gear-housing diagram before ordering. Mercury used different water-pump arrangements across horsepower ranges and production years.\u003c\/p\u003e\n\u003ch3\u003ePart Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent part number:\u003c\/strong\u003e 8M0204722\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatalog-form number:\u003c\/strong\u003e 12-8M0204722\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mercury Quicksilver\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct type:\u003c\/strong\u003e Water-pump impeller washer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Gear-housing raw-water pump\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupersedes:\u003c\/strong\u003e 8M0027721\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine OEM water-pump component\u003c\/li\u003e\n\u003cli\u003eInstalled directly beside the impeller in applicable assemblies\u003c\/li\u003e\n\u003cli\u003eWorks with the impeller key, face plate, pump housing, and related gaskets\u003c\/li\u003e\n\u003cli\u003eSome diagrams specify two washers per pump, one above and one below the impeller\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen to Replace This Washer\u003c\/h3\u003e\n\u003cp\u003eInspect and replace the washer during impeller or water-pump service if it is worn, distorted, grooved, corroded, damaged, or missing. Inspect both washers whenever the water pump is opened, particularly after overheating, reduced cooling-water flow, or impeller failure.\u003c\/p\u003e\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp\u003eInstall the washer in the exact order shown in the serial-specific gear-housing diagram. Many assemblies use one washer above and one below the impeller, with the drive key forming part of the same driveshaft stack. During service, inspect the impeller, key, upper housing, face plate, upper and lower gaskets, and water-tube seal. Follow the applicable service procedure for final assembly.\u003c\/p\u003e\n\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs this a general-purpose flat washer?\u003c\/strong\u003e\u003cbr\u003eNo. It is a diagram-specific component of compatible Mercury water-pump and impeller assemblies.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many washers are required?\u003c\/strong\u003e\u003cbr\u003eQuantity varies by application. Many diagrams show two washers, one on each side of the impeller.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat earlier number does it replace?\u003c\/strong\u003e\u003cbr\u003e8M0204722 supersedes Mercury part number 8M0027721.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e Replacing worn or missing impeller-stack washers while the lower unit is already apart for water-pump service.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMost common mistake:\u003c\/strong\u003e Reassembling the pump with only one washer when the diagram calls for one above and one below the impeller.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFitment guidance:\u003c\/strong\u003e Match the engine serial number, gear housing, washer quantity, and stack order to the applicable water-pump diagram before installation.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563924520996,"sku":"8M0204722","price":2.16,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/7639b89a-5275-4579-b26e-02283499f0bf.png?v=1790108552","url":"https:\/\/marisolmarine.com\/products\/merc-1316","provider":"Marisol Marine Company","version":"1.0","type":"link"}