{"product_id":"engine-circ-pump-gm-v6-sb-v8","title":"Sierra 18-3599-2 Circulating Water Pump","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0056\/9429\/2079\/files\/sierra-marine-engine-and-drive-parts-vector-logo.png?v=1777654573\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSierra 18-3599-2 Circulating Water Pump\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"87\" data-end=\"410\"\u003eKeep your engine running at the proper temperature with the Sierra 18-3599-2 Circulating Water Pump. Designed as a high-quality replacement for select OEM marine cooling systems, this bi-directional circulation pump helps maintain consistent coolant flow throughout the engine block for dependable performance on the water.\u003c\/p\u003e\n\u003cp data-start=\"412\" data-end=\"737\"\u003eUnlike a raw water pump, the circulation pump continuously moves coolant through the engine to regulate operating temperature and prevent overheating. A worn or failing pump can lead to coolant leaks, noisy bearings, unstable temperatures, or restricted circulation that can quickly turn into costly engine damage if ignored.\u003c\/p\u003e\n\u003cp data-start=\"739\" data-end=\"1109\"\u003eThe Sierra 18-3599-2 is built using durable marine-grade materials and engineered to meet or exceed OEM specifications for fit, performance, and reliability. Its bi-directional design allows compatibility with both standard and counter-rotating engines, making it a versatile replacement option for many popular marine applications. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"1111\" data-end=\"1114\"\u003e\n\u003ch3 data-section-id=\"lmqikf\" data-start=\"1116\" data-end=\"1144\"\u003eCommon Engine Fitments\u003c\/h3\u003e\n\u003cp data-start=\"1145\" data-end=\"1244\"\u003eThe Sierra 18-3599-2 circulation water pump is commonly used on GM-based marine engines, including:\u003c\/p\u003e\n\u003cul data-start=\"1246\" data-end=\"1473\"\u003e\n\u003cli data-section-id=\"9eyza6\" data-start=\"1246\" data-end=\"1268\"\u003eMerCruiser 4.3L V6\u003c\/li\u003e\n\u003cli data-section-id=\"jlix76\" data-start=\"1269\" data-end=\"1291\"\u003eMerCruiser 5.0L V8\u003c\/li\u003e\n\u003cli data-section-id=\"xlwk5x\" data-start=\"1292\" data-end=\"1314\"\u003eMerCruiser 5.7L V8\u003c\/li\u003e\n\u003cli data-section-id=\"dsdbth\" data-start=\"1315\" data-end=\"1348\"\u003eMerCruiser 6.2L MPI (377 CID)\u003c\/li\u003e\n\u003cli data-section-id=\"6yad5l\" data-start=\"1349\" data-end=\"1382\"\u003ePCM GM small block V8 engines\u003c\/li\u003e\n\u003cli data-section-id=\"6jzt11\" data-start=\"1383\" data-end=\"1419\"\u003eCrusader 305 and 350 CID engines\u003c\/li\u003e\n\u003cli data-section-id=\"5140l6\" data-start=\"1420\" data-end=\"1473\"\u003eVolvo Penta GM small block V6 and V8 applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1475\" data-end=\"1527\"\u003eThese engines are frequently found in boats such as:\u003c\/p\u003e\n\u003cul data-start=\"1529\" data-end=\"1761\"\u003e\n\u003cli data-section-id=\"e3pgm0\" data-start=\"1529\" data-end=\"1567\"\u003eSea Ray Sundancer and Sport series\u003c\/li\u003e\n\u003cli data-section-id=\"1dtffok\" data-start=\"1568\" data-end=\"1606\"\u003eChaparral SSi and Signature models\u003c\/li\u003e\n\u003cli data-section-id=\"1mt7yc7\" data-start=\"1607\" data-end=\"1636\"\u003eFour Winns Horizon series\u003c\/li\u003e\n\u003cli data-section-id=\"9oc8ev\" data-start=\"1637\" data-end=\"1670\"\u003eMalibu Response and Sunsetter\u003c\/li\u003e\n\u003cli data-section-id=\"1co8t6t\" data-start=\"1671\" data-end=\"1707\"\u003eSupra Launch and Sunsport models\u003c\/li\u003e\n\u003cli data-section-id=\"1x7qtpx\" data-start=\"1708\" data-end=\"1761\"\u003eCorrect Craft Ski Nautique and Super Air Nautique\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1763\" data-end=\"1981\"\u003eFitment depends on engine rotation, timing cover style, and cooling system configuration, so confirming compatibility with part number \u003cstrong data-start=\"1898\" data-end=\"1911\"\u003e18-3599-2\u003c\/strong\u003e before ordering is recommended. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"1983\" data-end=\"1986\"\u003e\n\u003ch3 data-section-id=\"1iz91iu\" data-start=\"1988\" data-end=\"2004\"\u003eKey Features\u003c\/h3\u003e\n\u003cul data-start=\"2005\" data-end=\"2373\"\u003e\n\u003cli data-section-id=\"1h9l3m0\" data-start=\"2005\" data-end=\"2053\"\u003eBi-directional marine circulation water pump\u003c\/li\u003e\n\u003cli data-section-id=\"1sztz6s\" data-start=\"2054\" data-end=\"2103\"\u003eDesigned for GM V6 and small block V8 engines\u003c\/li\u003e\n\u003cli data-section-id=\"pcx6hy\" data-start=\"2104\" data-end=\"2158\"\u003eHelps maintain proper engine operating temperature\u003c\/li\u003e\n\u003cli data-section-id=\"8x4l3k\" data-start=\"2159\" data-end=\"2221\"\u003eCompatible with standard and counter-rotating applications\u003c\/li\u003e\n\u003cli data-section-id=\"1ilnc6p\" data-start=\"2222\" data-end=\"2288\"\u003eMarine-grade construction for durability and long service life\u003c\/li\u003e\n\u003cli data-section-id=\"1uar2xk\" data-start=\"2289\" data-end=\"2373\"\u003eDirect replacement for select MerCruiser, PCM, Crusader, and Volvo Penta engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2375\" data-end=\"2378\"\u003e\n\u003ch3 data-section-id=\"1b9nce8\" data-start=\"2380\" data-end=\"2423\"\u003eWhy Replace a Circulation Water Pump?\u003c\/h3\u003e\n\u003cp data-start=\"2424\" data-end=\"2667\"\u003eOver time, pump bearings and seals can wear from heat and constant operation. Replacing a failing circulation pump helps restore proper coolant flow, stabilize engine temperature, and protect critical engine components from overheating damage.\u003c\/p\u003e\n\u003cp data-start=\"2669\" data-end=\"2930\"\u003eIf you’re servicing a GM-based marine engine, the Sierra 18-3599-2 circulation water pump delivers dependable cooling performance and OEM-style reliability trusted across a wide range of inboard and sterndrive applications.\u003c\/p\u003e","brand":"Land 'N' Sea","offers":[{"title":"Default Title","offer_id":48751556002049,"sku":"47-35992","price":229.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0056\/9429\/2079\/files\/Screenshot2026-05-08105937.png?v=1778252412","url":"https:\/\/inboardpartshq.com\/products\/engine-circ-pump-gm-v6-sb-v8","provider":"Inboard Parts HQ","version":"1.0","type":"link"}