{"product_id":"861578-power-steering-pump-pulley-for-mercruiser-4-3l-5-0l-5-7l-6-2l-v6-v8","title":"861578 Power Steering Pump Pulley for MerCruiser 4.3L 5.0L 5.7L 6.2L V6 V8 | JLM Marine","description":"\u003ch2\u003ePower Steering Pump Pulley 861578 – Fits MerCruiser 4.3L 5.0L 5.7L 6.2L V6 V8 Engines\u003c\/h2\u003e\n\n\u003cp\u003eThis \u003cstrong\u003epower steering pump pulley\u003c\/strong\u003e is engineered for \u003cstrong\u003eMerCruiser 4.3L, 5.0L, 5.7L, and 6.2L V6 and V8 engines\u003c\/strong\u003e, delivering reliable performance for serpentine belt-driven steering systems. Designed as a direct replacement for OEM part number \u003cstrong\u003e861578\u003c\/strong\u003e, this pulley ensures proper belt alignment and smooth power steering operation across a wide range of MerCruiser inboard and sterndrive applications.\u003c\/p\u003e\n\n\u003cp\u003eThis aftermarket pulley directly replaces \u003cstrong\u003eMercury MerCruiser 861578\u003c\/strong\u003e and aftermarket equivalent \u003cstrong\u003eSierra 18-8297\u003c\/strong\u003e, providing a cost-effective solution without compromising quality or fit.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eCompatible with MerCruiser serpentine belt systems on V6 and V8 engines\u003c\/li\u003e\n\u003cli\u003eDirect replacement for OEM 861578 and Sierra 18-8297\u003c\/li\u003e\n\u003cli\u003eEssential component for maintaining proper power steering function\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n\u003ctd\u003e861578\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-8297\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/mercury-outboard-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/diagrams\/mercury-parts-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eEngine Model\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e4.3L V6\u003c\/td\u003e\n\u003ctd\u003eSerpentine belt system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.0L V8\u003c\/td\u003e\n\u003ctd\u003eSerpentine belt system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e5.7L V8\u003c\/td\u003e\n\u003ctd\u003eSerpentine belt system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003eSerpentine belt system\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Part Number\u003c\/td\u003e\n\u003ctd\u003e861578\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003ePower Steering Pump Pulley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBelt Type\u003c\/td\u003e\n\u003ctd\u003eSerpentine Belt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Compatibility\u003c\/td\u003e\n\u003ctd\u003eMerCruiser 4.3L, 5.0L, 5.7L, 6.2L V6 \u0026amp; V8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e1 × Power Steering Pump Pulley (861578)\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eDisconnect the negative battery cable to prevent accidental starts during installation.\u003c\/li\u003e\n\u003cli\u003eRelieve tension on the serpentine belt using the appropriate tensioner tool and remove the belt from the power steering pump pulley.\u003c\/li\u003e\n\u003cli\u003eSecure the power steering pump shaft to prevent rotation, then remove the retaining bolt or nut from the old pulley.\u003c\/li\u003e\n\u003cli\u003eCarefully pull the old pulley off the pump shaft; note any shims or spacers and their positions.\u003c\/li\u003e\n\u003cli\u003eClean the pump shaft surface to remove any debris or residue before installing the new pulley.\u003c\/li\u003e\n\u003cli\u003eInstall any shims or spacers in their original positions, then slide the new pulley onto the shaft.\u003c\/li\u003e\n\u003cli\u003eThread the retaining bolt or nut and tighten to the manufacturer's specified torque (consult your service manual).\u003c\/li\u003e\n\u003cli\u003eReinstall the serpentine belt, ensuring proper routing and alignment across all pulleys.\u003c\/li\u003e\n\u003cli\u003eVerify that the belt tension is correct and the pulley spins freely without wobble or misalignment.\u003c\/li\u003e\n\u003cli\u003eReconnect the negative battery cable and start the engine to confirm proper operation.\u003c\/li\u003e\n\u003cli\u003eCheck for unusual noise or vibration and verify that power steering function is restored.\u003c\/li\u003e\n\u003cli\u003eInspect the belt and pulley after the first few hours of operation to ensure everything remains properly seated.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this pulley fits my MerCruiser engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Verify your engine is a 4.3L, 5.0L, 5.7L, or 6.2L V6\/V8 with a serpentine belt system, and cross-reference your current part number with 861578 or Sierra 18-8297. If your original pulley matches these specifications, this replacement will fit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my power steering pump pulley needs replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include squealing or chirping noises from the belt area, visible cracks or damage to the pulley grooves, belt slippage, or intermittent power steering function. A wobbling pulley or excessive wear on the serpentine belt also indicates replacement is needed.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I install this pulley myself or do I need a professional?\u003c\/strong\u003e\u003cbr\u003e\nA: Installation requires basic mechanical skills and tools, including a method to secure the pump shaft and a torque wrench. If you're comfortable working with serpentine belt systems and have the proper tools, DIY installation is feasible. Professional installation is recommended if you're uncertain about proper torque specs or belt alignment.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Will this aftermarket pulley perform the same as the OEM part?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes, this pulley is manufactured to OEM specifications using comparable-grade materials, ensuring proper fit and performance. While it's an aftermarket replacement (not an OEM component), it's produced in an ISO9002-certified facility and inspected for quality to meet the same functional standards.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What's the difference between OEM and aftermarket?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50990711963961,"sku":"21TP005","price":29.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/21TP005_1.webp?v=1754990521","url":"https:\/\/jlmmarine.com\/products\/861578-power-steering-pump-pulley-for-mercruiser-4-3l-5-0l-5-7l-6-2l-v6-v8","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}