{"product_id":"sherwood-29000-series-raw-water-pump-impeller-an5749","title":"Sherwood 29000-Series Raw Water Pump Impeller AN5749","description":"\u003ch2\u003eSherwood 29000-Series Raw Water Pump Impeller — AN5749\u003c\/h2\u003e\n\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003ctd\u003eAN5749\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSherwood\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eOfficial Product Type\u003c\/th\u003e\n\u003ctd\u003eFlexible Neoprene Raw Water Pump Impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003ePump Series\u003c\/th\u003e\n\u003ctd\u003eSherwood 29000-series (G2902X, G2903X, G2904X)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eImpeller Material\u003c\/th\u003e\n\u003ctd\u003eNeoprene\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eBlade Count\u003c\/th\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eOutside Diameter\u003c\/th\u003e\n\u003ctd\u003e3-3\/4 in. (95 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eWidth\u003c\/th\u003e\n\u003ctd\u003e4 in. (102 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eHub Drive\u003c\/th\u003e\n\u003ctd\u003e10-tooth spline\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eSystem\u003c\/th\u003e\n\u003ctd\u003eEngine Raw Water Cooling Circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eSupersedes\u003c\/th\u003e\n\u003ctd\u003eConfirm supersession with current Sherwood documentation\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth\u003eReplaced By\u003c\/th\u003e\n\u003ctd\u003eVerify current production status at time of order\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe AN5749 is a 12-blade neoprene flexible impeller for Sherwood 29000-series large raw water cooling pumps. With a 3-3\/4-inch (95 mm) outside diameter and an unusually wide 4-inch (102 mm) body on a 10-tooth splined hub, this is one of Sherwood’s largest impeller sizes, designed for the high cooling-water flow requirements of large marine diesel engines. It is sold here as an individual impeller replacement — for the complete service kit including gasket and O-ring, see the \u003ca href=\"https:\/\/marisolmarine.com\/products\/sherwood-29000k-impeller-kit-raw-water-pump\"\u003eSherwood 29000K Impeller Kit\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFitment note:\u003c\/strong\u003e Do not select this impeller by engine displacement or brand alone. Confirm that the installed pump specifically calls for a 29000-series Sherwood impeller using a 3-3\/4-inch diameter, 4-inch width, and 10-tooth splined hub before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSherwood G2902X large raw water pump\u003c\/li\u003e\n  \u003cli\u003eSherwood G2903X large raw water pump\u003c\/li\u003e\n  \u003cli\u003eSherwood G2904X large raw water pump\u003c\/li\u003e\n  \u003cli\u003eSelect Caterpillar 3406E, C15, and C18 marine engines (via G2902X pump)\u003c\/li\u003e\n  \u003cli\u003eCross-references to Caterpillar 296-8388, Cummins 4933742, John Deere DZ108622\u003c\/li\u003e\n  \u003cli\u003eAll applications: confirm pump model number and impeller dimensions before ordering\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDimensions\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eOutside diameter: 3-3\/4 in. \/ 95 mm\u003c\/li\u003e\n  \u003cli\u003eWidth: 4 in. \/ 102 mm\u003c\/li\u003e\n  \u003cli\u003eHub: 10-tooth spline\u003c\/li\u003e\n  \u003cli\u003eBlades: 12 flexible neoprene vanes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCross-Reference \/ Alternate Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAN5749\u003c\/strong\u003e — SKU as supplied\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSherwood 29000\u003c\/strong\u003e — impeller-only reference\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSherwood 29000K \/ 762-29000K\u003c\/strong\u003e — complete service kit (impeller + gasket + O-ring)\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eCaterpillar 296-8388 \/ 2968388\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eCummins 4933742\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eJohn Deere DZ108622\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003eJMP Marine 8359-01K | CEF 500192\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImpeller vs. Full Kit\u003c\/h3\u003e\n\u003cp\u003eThis listing is for the \u003cstrong\u003eimpeller only\u003c\/strong\u003e. If your pump service requires replacement of the gasket and O-ring as well, order the \u003ca href=\"https:\/\/marisolmarine.com\/products\/sherwood-29000k-impeller-kit-raw-water-pump\"\u003eSherwood 29000K Impeller Kit (762-29000K)\u003c\/a\u003e which includes the impeller, gasket, O-ring, and service instructions. The kit is the recommended choice when reassembling a pump that has been fully disassembled or has accumulated significant hours.\u003c\/p\u003e\n\n\u003ch3\u003eService Interval\u003c\/h3\u003e\n\u003cp\u003eInspect the raw water pump impeller at every annual engine service or every 200–300 hours of operation, whichever comes first. On high-output large-engine applications using 29000-series pumps, even partial blade damage significantly reduces cooling water flow. Replace proactively — do not wait for an overheating event.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReplace when blades are cracked, torn, hardened, or permanently bent\u003c\/li\u003e\n  \u003cli\u003eReplace when any blade fragments are missing — locate and flush all fragments from the cooling circuit\u003c\/li\u003e\n  \u003cli\u003eReplace when the 10-tooth spline hub shows wear or slippage\u003c\/li\u003e\n  \u003cli\u003eReplace after any dry-running event or cooling-system overheating alarm\u003c\/li\u003e\n  \u003cli\u003eReplace after ingestion of sand, silt, or debris\u003c\/li\u003e\n  \u003cli\u003eReplace at the scheduled cooling-system service interval regardless of visual condition\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eShut down the engine and close the raw-water seacock before beginning\u003c\/li\u003e\n  \u003cli\u003eRemove the pump cover and retrieve the old impeller — use Sherwood’s insert\/puller system if available\u003c\/li\u003e\n  \u003cli\u003eRecover all broken blade fragments from the pump body and downstream cooling circuit before fitting the new impeller\u003c\/li\u003e\n  \u003cli\u003eInspect the pump cam, wear plate, cover, housing, and shaft splines for scoring or damage\u003c\/li\u003e\n  \u003cli\u003eLubricate the new impeller with glycerine, soapy water, or another approved non-petroleum lubricant before installation\u003c\/li\u003e\n  \u003cli\u003eAlign the 10-tooth spline carefully before pressing the impeller onto the shaft\u003c\/li\u003e\n  \u003cli\u003eReplace the pump gasket and O-ring at the same time — see the \u003ca href=\"https:\/\/marisolmarine.com\/products\/sherwood-29000k-impeller-kit-raw-water-pump\"\u003e29000K kit\u003c\/a\u003e if these are not on hand\u003c\/li\u003e\n  \u003cli\u003eReopen the seacock and confirm strong cooling-water flow at the overboard discharge before placing the engine under load\u003c\/li\u003e\n  \u003cli\u003eNever run a flexible impeller pump dry\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Parts\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/marisolmarine.com\/products\/sherwood-29000k-impeller-kit-raw-water-pump\"\u003eSherwood 29000K Impeller Kit (762-29000K) — Complete Service Kit with Gasket \u0026amp; O-Ring\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/marisolmarine.com\/products\/sherwood-impeller-kit-18000k\"\u003eSherwood 18000K Impeller Kit — 14-Tooth Spline Raw Water Pump Service Kit\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/marisolmarine.com\/products\/sherwood-26000k-impeller-kit-g2600-raw-water-pump\"\u003eSherwood 26000K Impeller Kit — G2600 Raw Water Pump (10-Tooth, 3-1\/8 in. Wide)\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/marisolmarine.com\/products\/sherwood-27000k-impeller-kit-p270-raw-water-pump\"\u003eSherwood 27000K Impeller Kit — P270 Raw Water Pump Service Kit\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/marisolmarine.com\/products\/fairview-203\"\u003eSherwood Water Pump Cam Alignment Pin S21566\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/marisolmarine.com\/collections\/impeller-service-kits\"\u003eBrowse All Impeller Service Kits\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\n\u003cdl\u003e\n  \u003cdt\u003eHow do I confirm this is the correct impeller for my pump?\u003c\/dt\u003e\n  \u003cdd\u003eLocate the pump model number on the pump body or in your engine’s parts manual. If the pump is a Sherwood G2902X, G2903X, or G2904X, the 29000-series impeller is the correct fit. Confirm the 3-3\/4-inch diameter, 4-inch width, and 10-tooth splined hub against the old impeller or service documentation before ordering.\u003c\/dd\u003e\n\n  \u003cdt\u003eWhat is the difference between AN5749 (impeller only) and the 29000K kit?\u003c\/dt\u003e\n  \u003cdd\u003eAN5749 is the impeller alone. The 29000K kit includes the same impeller plus the pump gasket and O-ring. If your gasket and O-ring are in good condition and you are not disassembling the full pump, the impeller only may be sufficient. If the pump has been fully disassembled or the sealing parts are due for replacement, order the complete 29000K kit.\u003c\/dd\u003e\n\n  \u003cdt\u003eWhy does the 29000-series impeller have to be 4 inches wide specifically?\u003c\/dt\u003e\n  \u003cdd\u003eThe 4-inch width is what distinguishes the 29000-series from similar Sherwood impellers. The 26000K uses the same 10-tooth spline and 3-3\/4-inch diameter but is only 3-1\/8 inches wide. Fitting a narrower impeller in a 29000-series pump will reduce cooling water output significantly — confirm the width before ordering.\u003c\/dd\u003e\n\n  \u003cdt\u003eWhat happens if impeller blade fragments are not recovered?\u003c\/dt\u003e\n  \u003cdd\u003eRubber fragments from a broken impeller can lodge in the thermostat housing, heat exchanger passages, or cylinder head cooling galleries. This reduces or blocks cooling water flow and can cause a secondary overheating event even with a new impeller fitted. Flush the cooling circuit thoroughly and inspect the thermostat and heat exchanger after any impeller failure.\u003c\/dd\u003e\n\n  \u003cdt\u003eCan I reuse the old impeller for another season if it looks okay?\u003c\/dt\u003e\n  \u003cdd\u003eNot recommended on a high-output large-engine cooling system. Neoprene impellers harden and lose flexibility with age, heat cycling, and dry-running exposure. A visually acceptable impeller can fail suddenly under load. Annual replacement is the standard recommendation for commercial and high-hours marine diesel applications.\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003chr\u003e\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e The AN5749 29000-series impeller is the right choice for large marine diesel engine cooling systems — primarily Caterpillar 3406E, C15, and C18 applications using the Sherwood G2902X pump, and other high-volume cooling installations using the 29000-series pump body. At this price point, customers are typically doing a scheduled service on a commercial vessel, a serious power yacht, or a large workboat where the cooling system demands high-flow and the consequences of an impeller failure are significant. The impeller-only format suits customers who service their own pumps and already have gaskets on hand.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon customer questions:\u003c\/strong\u003e The most frequent issue is customers confusing the 29000-series with the 26000-series — both use a 10-tooth spline and a 3-3\/4-inch outside diameter, but the 29000 is 4 inches wide versus 3-1\/8 inches for the 26000. Always confirm the pump model number and impeller width before completing the order. The second common question is whether to order the impeller only or the full 29000K kit — recommend the kit if the pump has been disassembled or if the gasket and O-ring are unknown; recommend the impeller only if the customer is doing a cover-off impeller swap on a pump with known-good seals.\u003c\/p\u003e","brand":"FVW","offers":[{"title":"Default Title","offer_id":43563795054628,"sku":"an5749","price":282.23,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/f5c4e5c0-469f-45b5-bfad-23c2f24abcd7.png?v=1788743629","url":"https:\/\/marisolmarine.com\/products\/sherwood-29000-series-raw-water-pump-impeller-an5749","provider":"Marisol Marine Company","version":"1.0","type":"link"}