{"product_id":"merc-1260","title":"Mercury MerCruiser Seawater Pump Pulley – 8M0150724","description":"\u003ch2\u003eMercury MerCruiser Seawater Pump Pulley – 8M0150724\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 8M0150724\u003cbr\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mercury Marine \/ Quicksilver\u003cbr\u003e\n\u003cstrong\u003eOfficial Product Type:\u003c\/strong\u003e Seawater Pump Pulley – OEM\u003cbr\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Raw Water Cooling \/ Accessory Belt Drive\u003cbr\u003e\n\u003cstrong\u003eDrive Type:\u003c\/strong\u003e Serpentine belt\u003c\/p\u003e\n\n\u003ch3\u003eAbout This Part\u003c\/h3\u003e\n\u003cp\u003eThis is the genuine Mercury OEM seawater pump pulley for MerCruiser sterndrive engines equipped with a serpentine belt accessory drive system. The seawater pump (also called the raw water pump) draws water from outside the hull and circulates it through the engine’s heat exchanger to keep the engine at operating temperature. This pulley mounts on the seawater pump shaft and is driven by the serpentine belt — if the pulley is worn, cracked, or misaligned, the belt slips or tracks incorrectly, reducing raw water flow and risking engine overheating.\u003c\/p\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMerCruiser 4.3L V6 – serpentine belt accessory drive models\u003c\/li\u003e\n\u003cli\u003eMerCruiser 5.0L V8 – serpentine belt accessory drive models\u003c\/li\u003e\n\u003cli\u003eMerCruiser 5.7L V8 – serpentine belt accessory drive models\u003c\/li\u003e\n\u003cli\u003eMerCruiser 6.2L V8 – serpentine belt accessory drive models\u003c\/li\u003e\n\u003cli\u003eMerCruiser 7.4L V8 – serpentine belt accessory drive models\u003c\/li\u003e\n\u003cli\u003eMerCruiser 8.2L V8 – serpentine belt accessory drive models\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eAlways verify fitment using your engine serial number. MerCruiser engines of the same displacement can use different accessory drive configurations depending on model year and cooling setup. Confirm part number 8M0150724 appears on the Mercury MerCruiser parts diagram for your engine before ordering.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eSerial Number \/ Fitment Note\u003c\/h3\u003e\n\u003cp\u003eLocate your MerCruiser engine serial number on the engine block tag or flame arrestor decal. Cross-reference against the Mercury MerCruiser parts diagram for your engine model to confirm this is the correct seawater pump pulley. Some MerCruiser engines use a V-belt drive rather than a serpentine belt — this pulley is for serpentine belt systems only.\u003c\/p\u003e\n\n\u003ch3\u003eSystem \u0026amp; Diagram Position\u003c\/h3\u003e\n\u003cp\u003eThis pulley is found in the \u003cstrong\u003eRaw Water Cooling \/ Accessory Belt Drive\u003c\/strong\u003e section of the Mercury MerCruiser parts diagram. It mounts on the seawater pump shaft and is driven by the serpentine belt alongside the power steering pump pulley, tensioner pulley, and idler pulley. Correct pulley alignment across the entire accessory drive is critical — a misaligned seawater pump pulley will cause belt wear and tracking issues that affect all belt-driven accessories.\u003c\/p\u003e\n\n\u003ch3\u003eSupersedes \/ Cross-Reference Numbers\u003c\/h3\u003e\n\u003cp\u003e8M0150724 is the current Mercury OEM part number for this seawater pump pulley. If your parts diagram shows an earlier number, 8M0150724 is the current replacement. Always confirm against your engine’s diagram and serial number.\u003c\/p\u003e\n\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVisible cracks, chips, or corrosion damage to the pulley face or hub\u003c\/li\u003e\n\u003cli\u003eBelt grooves worn smooth — causes belt slip, squeal, and reduced pump speed\u003c\/li\u003e\n\u003cli\u003ePulley wobble or runout when spun by hand (indicates a bent hub or worn pump shaft bearing)\u003c\/li\u003e\n\u003cli\u003eBelt misalignment traced to the seawater pump pulley position\u003c\/li\u003e\n\u003cli\u003eEngine overheating caused by reduced raw water flow from belt slippage\u003c\/li\u003e\n\u003cli\u003eReplacing the seawater pump — inspect the pulley at the same time and replace if worn\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eService Interval\u003c\/h3\u003e\n\u003cp\u003eInspect the seawater pump pulley annually as part of routine belt and cooling system service. Replace whenever wear, damage, or misalignment is found, or whenever the seawater pump is serviced or replaced. The serpentine belt should be inspected at the same interval and replaced if it shows cracking, glazing, or fraying.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eA pulley puller is required to remove the old pulley — do not pry or hammer it off, as this damages the pump shaft and bearing\u003c\/li\u003e\n\u003cli\u003eA pulley press or installer tool is required to seat the new pulley to the correct depth on the shaft\u003c\/li\u003e\n\u003cli\u003eConfirm pulley alignment with all adjacent pulleys using a straightedge before reinstalling the serpentine belt\u003c\/li\u003e\n\u003cli\u003eInspect the serpentine belt for wear and replace if it has been running on a damaged or misaligned pulley\u003c\/li\u003e\n\u003cli\u003eAfter installation, run the engine and verify normal coolant temperature and raw water flow at the exhaust\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/merc-1259\"\u003eMercury MerCruiser Power Steering Pump Pulley – 8M0150723\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/merc-1261\"\u003eMercury MerCruiser Serpentine Belt Pulley Kit – 8M0150824\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/merc-1267\"\u003eQuicksilver Water Pump Pulley – 8M0153706\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/merc-902\"\u003eMercury MerCruiser Quicksilver Tensioner Pulley – 865777\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/merc-895\"\u003eMercury MerCruiser Quicksilver Serpentine Belt – 865615Q03\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/merc-1066\"\u003eMercury MerCruiser Quicksilver Serpentine Belt – 8M0045986\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/merc-1218\"\u003eMercury MerCruiser Quicksilver Serpentine Belt – 8M0135333\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/merc-1231\"\u003eMercury MerCruiser Sea Pump Pulley – 8M0141645\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat happens if the seawater pump pulley fails while underway?\u003c\/strong\u003e\u003cbr\u003e\nIf the pulley cracks or the belt slips off, the seawater pump stops circulating raw water through the cooling system. The engine will overheat within minutes. Overheating can cause head gasket failure, warped cylinder heads, and serious internal engine damage. This is a safety-critical component — inspect it regularly and replace at the first sign of wear.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need a special tool to change this pulley?\u003c\/strong\u003e\u003cbr\u003e\nYes. A pulley puller is required to remove the old pulley without damaging the pump shaft. A pulley press or installer is required to seat the new pulley correctly. Attempting to hammer the pulley on or off will damage the pump bearing and shaft, turning a simple pulley replacement into a full pump replacement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShould I replace the serpentine belt at the same time?\u003c\/strong\u003e\u003cbr\u003e\nYes, if the belt has been running on a worn or damaged pulley. A damaged pulley surface accelerates belt wear. Since the belt must be removed to replace the pulley, it’s good practice to install a new belt at the same time — especially at the start of the season or at the 300-hour service interval.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I confirm this is the right pulley for my engine?\u003c\/strong\u003e\u003cbr\u003e\nLook up your engine serial number in the Mercury MerCruiser parts diagram under the accessory belt drive or raw water cooling section. The seawater pump pulley part number will be listed there. If you’re unsure, contact us with your serial number and we can help confirm the correct part.\u003c\/p\u003e\n\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e This pulley is the right part for a MerCruiser sterndrive that is showing belt tracking issues, belt squeal from the cooling side of the accessory drive, or reduced raw water flow that traces back to belt slippage rather than the pump impeller. It’s also the correct part to order alongside a seawater pump replacement — if the pump has been running hot or dry, the pulley should be inspected and replaced at the same time.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon issues:\u003c\/strong\u003e Customers sometimes order this pulley without confirming their engine uses a serpentine belt drive — older MerCruiser engines use a V-belt system and require a different pulley. A second common issue is replacing the pulley without replacing the serpentine belt; if the pulley was worn or misaligned, the belt has been running under stress and should be replaced as a set. Also watch for customers who overlook the pulley when diagnosing overheating — a slipping seawater pump belt is a frequent cause of mild overheating that gets misdiagnosed as an impeller or thermostat issue.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563922063396,"sku":"8M0150724","price":183.19,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/7f607d3a-d6d0-4294-8626-7190bf0470fc.png?v=1787264721","url":"https:\/\/marisolmarine.com\/products\/merc-1260","provider":"Marisol Marine Company","version":"1.0","type":"link"}