{"product_id":"johnson-pump-09-1029b-f8-neoprene-impeller-kit","title":"Johnson Pump 09-1029B F8 Neoprene Impeller Kit","description":"\u003cp class=\"nvn-hero\"\u003eThe Johnson Pump 09-1029B is the genuine neoprene replacement impeller for the F8 engine cooling pump. It's the one part that actually wears, sized at 3.74 inches across and 2.48 inches thick to drop straight into the F8 body. Swap it on schedule and your raw-water cooling keeps doing its job.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eWhen your Johnson F8 engine cooling pump starts pushing less water than it used to, the impeller is almost always the culprit. This is the genuine Johnson Pump 09-1029B replacement, a neoprene flexible-vane impeller sized specifically for the F8 pump body. It measures 3.74 inches across the outer diameter and 2.48 inches thick, so it drops into the F8 housing without machining or shimming.\u003c\/p\u003e\n\u003cp\u003eHere's the thing about raw-water impellers. They're a wear part, plain and simple. The flexible neoprene vanes flick water through the pump every second the engine runs, and over a season or two they take a set, lose their spring, and start to crack at the base. A tired impeller moves less coolant, your engine runs hotter, and eventually a vane lets go entirely. Replacing it on a schedule is a lot cheaper than a cooked engine.\u003c\/p\u003e\n\u003cp\u003eWhy neoprene? It's the everyday workhorse compound for marine raw-water pumps. It flexes well cold, it primes quickly, and it shrugs off the normal mix of salt, silt, and the odd bit of weed that comes through a raw-water intake. This kit is a single impeller, the one part that actually wears, so you're not paying for a full pump rebuild when all your F8 needs is a fresh set of vanes.\u003c\/p\u003e\n\u003cp\u003eWe tell folks to swap the impeller at the start of every season, or roughly every 200 running hours if you put on a lot of water time. If you run in brackish or warm water, lean toward the shorter interval. Neoprene holds up fine to normal raw-water cooling duty, but heat and grit are what age it. So if your F8 lives in a hot, sandy inlet, don't stretch the calendar.\u003c\/p\u003e\n\u003cp\u003eThe install itself is straightforward, but there are a couple of things worth getting right. Before you drop the new impeller in, check that the cover plate and wear plate are flat and not scored. A warped cover can bind a fresh 2.48-inch impeller and chew it up fast. Coat the vanes with a light film of glycerin or a dedicated impeller lube, never petroleum grease, since oil-based products swell and destroy neoprene. Seat the impeller with the vanes curved in the right direction of rotation, then turn the engine over by hand before you ever hit the starter. You want to feel the vanes flex and confirm nothing is binding. Skip that step and you can overheat on the very first start.\u003c\/p\u003e\n\u003cp\u003eNew gasket every time. It's cheap insurance, and reusing a squashed old gasket is how you end up with a slow raw-water leak behind the pump. If your kit didn't come with fresh sealing hardware, grab an F8 gasket while you're at it.\u003c\/p\u003e\n\u003cp\u003eOne more real-world note. It's normal for the pump to whine a little on the first start after a service until it primes and pushes the air out of the cooling circuit. Let it catch its water and the noise settles. If it keeps howling and you don't see a steady stream out the telltale, shut down and bleed the air out before you run it dry. And that's the golden rule with any neoprene impeller: never run it dry, not even for the few seconds it takes to winterize. Dry running tears the vanes almost instantly.\u003c\/p\u003e\n\u003cp\u003eIf a vane does break off, hunt it down. Pieces travel downstream into the cooling passages and exhaust elbow, and a stray chunk lodged in a hose can block flow just like a bad impeller would. Pull the hose at the pump outlet and account for every vane before you call the job done.\u003c\/p\u003e\n\u003cp\u003eThis is the exact wear part your F8 pump was built around. Keep a spare aboard, service it on schedule, and the cooling system will take care of you.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eNeoprene flexible-vane impeller sized specifically for the Johnson F8 engine cooling pump\u003c\/li\u003e\n  \u003cli\u003e3.74 inch outer diameter x 2.48 inch thickness, a direct drop-in fit with no machining or shimming\u003c\/li\u003e\n  \u003cli\u003eNeoprene compound primes fast and handles everyday raw-water engine cooling duty\u003c\/li\u003e\n  \u003cli\u003eSingle impeller kit, the one wear part your F8 pump needs at service time\u003c\/li\u003e\n  \u003cli\u003eFlexible vanes move water efficiently even at low idle RPM\u003c\/li\u003e\n  \u003cli\u003eDirect replacement for a worn, cracked, or torn factory impeller\u003c\/li\u003e\n  \u003cli\u003eGenuine Johnson Pump part, MPN 09-1029B\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Johnson Pump reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat pump does the 09-1029B impeller fit?\u003c\/summary\u003e\n    \u003cp\u003eIt's sized for the Johnson F8 engine cooling pump. The 3.74 inch outer diameter and 2.48 inch thickness match the F8 body so it drops in without machining.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the impeller made of?\u003c\/summary\u003e\n    \u003cp\u003eNeoprene. It's the standard flexible-vane compound for marine raw-water pumps, primes quickly, and stands up to normal salt and silt.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the exact dimensions?\u003c\/summary\u003e\n    \u003cp\u003e3.74 inches outer diameter by 2.48 inches thick. Those are the F8 impeller dimensions, so measure your old one if you're unsure which pump you have.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I replace it?\u003c\/summary\u003e\n    \u003cp\u003eSwap it at the start of every season, or about every 200 running hours. If you run in brackish or warm water, lean toward the shorter interval since heat and grit age neoprene faster.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat happens if I run the pump dry?\u003c\/summary\u003e\n    \u003cp\u003eThe vanes tear almost instantly. Never run a neoprene impeller dry, not even for the few seconds it takes to winterize the engine.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo I need to lubricate the impeller on install?\u003c\/summary\u003e\n    \u003cp\u003eYes, a light film of glycerin or a dedicated impeller lube on the vanes helps it prime. Never use petroleum grease, which swells and destroys neoprene.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know the impeller is seated correctly?\u003c\/summary\u003e\n    \u003cp\u003eInstall it with the vanes curved in the direction of rotation, then turn the engine over by hand before starting. You should feel the vanes flex and nothing binding.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy does my pump whine on the first start after service?\u003c\/summary\u003e\n    \u003cp\u003eThat's usually air in the cooling circuit. Let the pump catch its water and prime. If it keeps howling with no telltale stream, shut down and bleed the air before you run it dry.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eShould I replace the gasket at the same time?\u003c\/summary\u003e\n    \u003cp\u003eYes. A fresh gasket is cheap insurance against a slow raw-water leak behind the pump. Don't reuse a squashed old one.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eA vane broke off my old impeller. What should I do?\u003c\/summary\u003e\n    \u003cp\u003eFind it. Broken vanes travel downstream into the cooling passages and exhaust elbow, and a lodged piece can block flow. Pull the outlet hose and account for every vane before finishing the job.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a genuine Johnson Pump part?\u003c\/summary\u003e\n    \u003cp\u003eYes, it's the genuine Johnson Pump 09-1029B impeller kit, not a generic aftermarket copy.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eJohnson Pump 09-1029B F8 Neoprene Impeller Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eJohnson Pump\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e09-1029B\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e7330717001629\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eImpeller Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCompatible Pump\u003c\/th\u003e\n\u003ctd\u003eJohnson F8 Engine Pump\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\u003eImpeller Style\u003c\/th\u003e\n\u003ctd\u003eFlexible Vane\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003e3.74 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eThickness\u003c\/th\u003e\n\u003ctd\u003e2.48 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eEngine Cooling\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eConfiguration\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What pump does the 09-1029B impeller fit?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's sized for the Johnson F8 engine cooling pump. The 3.74 inch outer diameter and 2.48 inch thickness match the F8 body so it drops in without machining.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the impeller made of?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Neoprene. It's the standard flexible-vane compound for marine raw-water pumps, primes quickly, and stands up to normal salt and silt.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What are the exact dimensions?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"3.74 inches outer diameter by 2.48 inches thick. Those are the F8 impeller dimensions, so measure your old one if you're unsure which pump you have.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How often should I replace it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Swap it at the start of every season, or about every 200 running hours. If you run in brackish or warm water, lean toward the shorter interval since heat and grit age neoprene faster.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What happens if I run the pump dry?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The vanes tear almost instantly. Never run a neoprene impeller dry, not even for the few seconds it takes to winterize the engine.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Do I need to lubricate the impeller on install?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes, a light film of glycerin or a dedicated impeller lube on the vanes helps it prime. Never use petroleum grease, which swells and destroys neoprene.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I know the impeller is seated correctly?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Install it with the vanes curved in the direction of rotation, then turn the engine over by hand before starting. You should feel the vanes flex and nothing binding.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why does my pump whine on the first start after service?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"That's usually air in the cooling circuit. Let the pump catch its water and prime. If it keeps howling with no telltale stream, shut down and bleed the air before you run it dry.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Should I replace the gasket at the same time?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. A fresh gasket is cheap insurance against a slow raw-water leak behind the pump. Don't reuse a squashed old one.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"A vane broke off my old impeller. What should I do?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Find it. Broken vanes travel downstream into the cooling passages and exhaust elbow, and a lodged piece can block flow. Pull the outlet hose and account for every vane before finishing the job.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this a genuine Johnson Pump part?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes, it's the genuine Johnson Pump 09-1029B impeller kit, not a generic aftermarket copy.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Johnson Pump","offers":[{"title":"Default Title","offer_id":45068731023453,"sku":"2009026","price":56.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_692f1323-86b1-46c5-8cc7-5519e8b91979.jpg?v=1789685423","url":"https:\/\/nvnmarine.com\/products\/johnson-pump-09-1029b-f8-neoprene-impeller-kit","provider":"NVN Marine","version":"1.0","type":"link"}