{"product_id":"merc-531","title":"Mercury MerCruiser Quicksilver Cylinder-Block Bolt M8 x 90 803509","description":"\u003ch2\u003eProduct Description\u003c\/h2\u003e\u003cp\u003eMercury MerCruiser Quicksilver 10-803509 is the M8 x 90 mm bolt specified in the cylinder-block \/ cylinder-head assembly on selected Mercury and Mariner 4, 5 and 6HP FourStroke outboards.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eOEM bolt, full reference 10-803509.\u003c\/li\u003e\n\u003cli\u003eNominal thread diameter: M8.\u003c\/li\u003e\n\u003cli\u003eCatalog length: 90 mm.\u003c\/li\u003e\n\u003cli\u003eCylinder-block \/ cylinder-head assembly location.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\u003cp\u003eVerified diagram application includes Mercury 4HP FourStroke, serial numbers 0R000001–0R067089. The part also appears in later 4 \/ 5 \/ 6HP FourStroke cylinder-block diagrams. Confirm the exact engine serial range and bolt position.\u003c\/p\u003e\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\u003cp\u003eThe same assembly contains shorter M8 bolts with different part numbers. Keep each bolt in its specified position and inspect the threads before installation. Follow the engine service manual for tightening sequence, torque, thread preparation and any replacement requirement.\u003c\/p\u003e\u003ch2\u003eParts Desk Insight\u003c\/h2\u003e\u003cp\u003e803509 is the 90 mm bolt. The similar 8035091 reference is listed as M8 x 60 mm in the same engine family; the suffix changes the fastener.\u003c\/p\u003e\u003ch2\u003eManufacturer Parts Lookup\u003c\/h2\u003e\u003cp\u003e\u003ca href=\"https:\/\/www.mercurymarine.com\/us\/en\/parts-finder\"\u003eUse Mercury’s official parts finder\u003c\/a\u003e to check the part against your engine or drive serial number.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563872288804,"sku":"803509","price":12.41,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/mercury-brand-placeholder-user-provided_f133b6cb-4534-4e1e-9257-a8d7904ec67c.jpg?v=1791244460","url":"https:\/\/marisolmarine.com\/products\/merc-531","provider":"Marisol Marine Company","version":"1.0","type":"link"}