{"product_id":"johnson-pump-09-806b-1-f35-impeller-mc97-cooling","title":"Johnson Pump 09-806B-1 F35 Impeller | MC97 Cooling","description":"\u003cp class=\"nvn-hero\"\u003eThe Johnson Pump 09-806B-1 is the flexible cooling impeller for the F35 engine pump. Molded from MC97\/EPDM at 1.58 in outer diameter and 3\/4 in thick, it pumps raw water through your engine's cooling circuit. It's the cheapest, most important spare to keep aboard.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe Johnson Pump 09-806B-1 is the flexible impeller that keeps raw water moving through your F35 engine cooling pump. It's a small part with a big job. When it's healthy, cool water flows through the engine and everything runs at temperature. When it's worn or torn, flow drops, the engine heats up, and you're shut down until it's fixed. That's why this is one of the cheapest, most important spares to keep on the boat.\u003c\/p\u003e\n\u003cp\u003eThis impeller is molded from MC97\/EPDM, a rubber compound built to handle the heat and constant flexing inside a cooling pump. It measures 1.58 inches on the outer diameter, 0.37 inches through the inner bore, and 3\/4 inch thick. Those numbers matter. The thickness is matched to the F35 housing depth, so the vanes wipe the pump wall correctly and the impeller stays put instead of walking out over time. It's sold as a single impeller, sized to fit the Johnson F35 pump exactly.\u003c\/p\u003e\n\u003cp\u003eHere's the thing about flexible impellers. They're a wear item, not a lifetime part. The rubber vanes bend against the pump cam thousands of times a minute, and they take a set, harden, and eventually crack. Johnson's own guidance is simple. Change the impeller every year. We'd add one more rule. Change it any time you already have the pump cover off for other service. You're right there, the gasket is disturbed, and a fresh impeller is cheap insurance against a hot-engine day.\u003c\/p\u003e\n\u003cp\u003eThe number one killer of these impellers is running dry. The vanes rely on water for lubrication and cooling, so even a few seconds of dry running can melt or shred them. Always make sure the seacock is open and the pump is primed before you start. If you've been on the hard or replaced a hose, prime the raw water side first. A dry impeller can be ruined before the engine even settles into idle.\u003c\/p\u003e\n\u003cp\u003eReplacing one is a job most boaters can do at the dock. Close the seacock. Pull the pump cover plate and gasket. Note which way the vanes are curved, because the new impeller goes back in with the same set. Work the old impeller off the shaft, clean the housing, and check the cam and wear plate for grooves while you're in there. A little glycerin or dish soap on the new vanes helps it seat and gives you lubrication for that first dry moment at startup. Line up the bore, push it home, replace the gasket and cover, and open the seacock. Fire it up and confirm you've got a steady stream of cooling water before you leave the slip.\u003c\/p\u003e\n\u003cp\u003eBecause this impeller matches the F35 pump dimensionally, it seats and seals the way the factory part does. That's the reason we stock genuine Johnson impellers rather than generic clones. Aftermarket copies are often cut a hair thin, and a thin impeller can slip in the housing, lose its wipe against the wall, and pump poorly right out of the box. When the whole point of the part is a tight, correct fit, matching the original spec is what keeps your cooling flow honest.\u003c\/p\u003e\n\u003cp\u003eWho's this for? Anyone running a Johnson F35 engine cooling pump who wants to stay ahead of the maintenance instead of chasing an overheat. Keep one in the spares box, change it at the start of every season, and swap it whenever you pull the pump for other work. It's a cheap problem if you plan for it and a ruined weekend if you don't. If you also need the pump's gaskets, O-rings, or wear plate, grab those separately, because this listing is the impeller by itself.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eMC97\/EPDM flexible impeller built for the heat and constant flexing of engine cooling duty\u003c\/li\u003e\n  \u003cli\u003e1.58 in outer diameter and 0.37 in inner bore, sized to the Johnson F35 pump\u003c\/li\u003e\n  \u003cli\u003e3\/4 in thickness matched to the F35 housing depth so the vanes wipe the wall and the impeller stays seated\u003c\/li\u003e\n  \u003cli\u003eGenuine Johnson Pump part, so it matches your pump exactly instead of slipping like a thin clone\u003c\/li\u003e\n  \u003cli\u003ePumps raw water through the engine's cooling circuit to hold operating temperature\u003c\/li\u003e\n  \u003cli\u003eSold as a single impeller, ideal for annual service or a spare in the box\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 is the Johnson Pump 09-806B-1?\u003c\/summary\u003e\n    \u003cp\u003eIt's the flexible cooling impeller for the Johnson F35 engine pump. It's molded from MC97\/EPDM and sold as a single impeller.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat size is this impeller?\u003c\/summary\u003e\n    \u003cp\u003eIt measures 1.58 inches outer diameter, 0.37 inches through the inner bore, and 3\/4 inch thick. The thickness is matched to the F35 housing depth so it seats correctly.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I replace it?\u003c\/summary\u003e\n    \u003cp\u003eJohnson recommends changing the impeller every year. It's also smart to swap it any time you already have the pump cover off for other work.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy did my old impeller fail?\u003c\/summary\u003e\n    \u003cp\u003eFlexible impellers are a wear item. The rubber vanes harden and crack with age, and running the pump dry even briefly can melt or tear them.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I run the engine dry to test it?\u003c\/summary\u003e\n    \u003cp\u003eNo. The impeller needs water for lubrication and cooling. Always open the seacock and prime the raw water side before you start.\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 original Johnson impeller, sized to match the F35 pump exactly so it seats and seals the way the factory part does.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it come with gaskets or O-rings?\u003c\/summary\u003e\n    \u003cp\u003eNo, this listing is the impeller by itself. If you need the pump cover gasket or O-rings, order those separately.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow hard is it to change?\u003c\/summary\u003e\n    \u003cp\u003eMost boaters can do it at the dock. Close the seacock, pull the cover plate, note the vane direction, swap the impeller, lube it, and reassemble. Confirm cooling water flow before leaving the slip.\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 09-806B-1 Impeller, Used With F35 Engine Pump, 1.58 in OD x 0.37 in ID x 3\/4 in Thickness, MC97\/EPDM, Cooling, Single\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\u003e09-806B-1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e7330717008727\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePart Type\u003c\/th\u003e\n\u003ctd\u003eFlexible Cooling Impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eMC97 \/ EPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003e1.58 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eInner Diameter\u003c\/th\u003e\n\u003ctd\u003e0.37 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eThickness\u003c\/th\u003e\n\u003ctd\u003e3\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eEngine Cooling (raw water)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFits\u003c\/th\u003e\n\u003ctd\u003eJohnson F35 Engine Pump\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSold As\u003c\/th\u003e\n\u003ctd\u003eSingle\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCross-Reference\u003c\/th\u003e\n\u003ctd\u003eReplaces Jabsco 4528-0001\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 is the Johnson Pump 09-806B-1?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's the flexible cooling impeller for the Johnson F35 engine pump. It's molded from MC97\/EPDM and sold as a single impeller.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What size is this impeller?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It measures 1.58 inches outer diameter, 0.37 inches through the inner bore, and 3\/4 inch thick. The thickness is matched to the F35 housing depth so it seats correctly.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How often should I replace it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Johnson recommends changing the impeller every year. It's also smart to swap it any time you already have the pump cover off for other work.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why did my old impeller fail?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Flexible impellers are a wear item. The rubber vanes harden and crack with age, and running the pump dry even briefly can melt or tear them.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I run the engine dry to test it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. The impeller needs water for lubrication and cooling. Always open the seacock and prime the raw water side before you start.\"\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 original Johnson impeller, sized to match the F35 pump exactly so it seats and seals the way the factory part does.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it come with gaskets or O-rings?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No, this listing is the impeller by itself. If you need the pump cover gasket or O-rings, order those separately.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How hard is it to change?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Most boaters can do it at the dock. Close the seacock, pull the cover plate, note the vane direction, swap the impeller, lube it, and reassemble. Confirm cooling water flow before leaving the slip.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Johnson Pump","offers":[{"title":"Default Title","offer_id":45076462862429,"sku":"2009745","price":27.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_c7de9c83-dd7e-4e96-aa97-a345e58fb18b.png?v=1789888570","url":"https:\/\/nvnmarine.com\/products\/johnson-pump-09-806b-1-f35-impeller-mc97-cooling","provider":"NVN Marine","version":"1.0","type":"link"}