{"product_id":"johnson-pump-f6-mc97-impeller-20-pack-812bt-1","title":"Johnson Pump 812BT-1 F6 MC97 Flexible Impeller, Bulk Pack of 20","description":"\u003cp class=\"nvn-hero\"\u003eThese are the genuine Johnson Pump F6 flexible impellers, sold 20 to a pack. The MC97 vanes keep water moving through your F6 raw-water, washdown, or transfer pump. If you maintain a fleet or run a shop, buying the bulk pack drops your cost per impeller and keeps spares in the drawer.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThese are the genuine Johnson Pump F6 flexible impellers, sold in a bulk pack of 20. If you run an F6-series Johnson pump for raw-water engine cooling, washdown, or general transfer, this is the wear part that keeps water moving. The impeller is the heart of the pump. When it's healthy you get steady flow and stable pressure. When it's worn, you get overheating, weak washdown, and a bad afternoon.\u003c\/p\u003e\n\u003cp\u003eEach impeller is molded from the MC97 compound, the flexible nitrile material Johnson Pump uses for its marine raw-water impellers. The vanes flex as the shaft turns and sweep water through the pump housing. That flexing is exactly why the impeller is a wear item. Over a season the vanes take a set, the tips wear, and eventually one cracks or tears. Run the pump dry even for a short stretch and you can cook an impeller in seconds, because the water is what keeps those vanes cool and lubricated. So the smart move is to keep spares on hand and change them before they fail, not after.\u003c\/p\u003e\n\u003cp\u003eThe bulk pack of 20 is built for people who go through impellers. Repair shops, boatyards, engine rebuilders, charter fleets, and anyone maintaining a row of boats with F6 pumps. Buying the 20-pack drops your cost per impeller well below the single-unit price and means you're never waiting on a part when a customer's boat is on the lift. If you only need one impeller for a single seasonal service, this probably isn't the pack for you. But if you keep a parts drawer stocked, it pays for itself fast.\u003c\/p\u003e\n\u003cp\u003eFitment is straightforward. These are the F6 impeller with the splined bore drive, measuring 2-1\/4 inches (57.1 mm) across the outer diameter and 1.9 inches (48.2 mm) wide. The splines slide onto the pump shaft so the impeller is driven positively without a key or setscrew. Before you order in volume, pull one of your worn impellers and confirm the outer diameter and width match. F6 housings are specific, and an impeller that's even slightly off on the OD won't seal against the cam the way it should.\u003c\/p\u003e\n\u003cp\u003eChanging one is a ten-minute job once you've done a couple. Pull the pump cover, work the old impeller off the shaft, coat the new one in a little glycerin or dish soap so the vanes seat without dry drag on first start, and slide it home. A lot of techs bend the vanes the same direction the pump turns as they push it in. Because these come bulk with no cover gasket or o-ring in the pack, keep a few gaskets in your kit if your service calls for a fresh one. And do yourself a favor, change the impeller on schedule. Most raw-water impellers get swapped at least once a season or on the engine maker's hour interval, and with 20 in the box you've got no excuse to run one past its life.\u003c\/p\u003e\n\u003cp\u003eHow do you know it's time? Pull the cover and look at the vanes. Cracks at the base, torn or missing tips, a permanent curl or flat spot where the vanes have taken a set, or a gummy, swollen feel to the rubber all mean that impeller is done. Any black rubber flakes downstream in the cooling circuit are a sign an impeller already came apart, and you'll want to chase those bits out of the system so they don't block a hose or a heat exchanger. Water quality matters too. Silty, sandy, or fuel-contaminated water is hard on the rubber and shortens impeller life, so boats working dirty water go through these faster than a clean-water cruiser.\u003c\/p\u003e\n\u003cp\u003eFor off-season storage, some owners pull the impeller entirely and store it in a bag so the vanes don't take a permanent set sitting bent in a dry housing all winter. Others leave it in and just replace it at spring commissioning. Either way, having a stack of 20 on the shelf makes that call easy. Keep them out of direct sunlight and away from heat, and they'll wait for you in the drawer for years.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eMC97 flexible nitrile compound, the material Johnson Pump uses for its marine raw-water impellers\u003c\/li\u003e\n  \u003cli\u003e2-1\/4 inch (57.1 mm) outer diameter sized to seal against the F6 pump cam\u003c\/li\u003e\n  \u003cli\u003e1.9 inch (48.2 mm) width matched to the F6 pump housing\u003c\/li\u003e\n  \u003cli\u003eSplined bore drives off the pump shaft with no key or setscrew\u003c\/li\u003e\n  \u003cli\u003eFits Johnson Pump F6 series raw-water, washdown, and transfer pumps\u003c\/li\u003e\n  \u003cli\u003eSold as a bulk pack of 20 for shops, boatyards, and fleets\u003c\/li\u003e\n  \u003cli\u003eGenuine Johnson Pump part number 812BT-1\u003c\/li\u003e\n  \u003cli\u003eFlexible vanes deliver steady flow and stable pressure until the wear point\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 pumps does the 812BT-1 impeller fit?\u003c\/summary\u003e\n    \u003cp\u003eIt's the flexible impeller for Johnson Pump F6 series pumps, used for raw-water engine cooling, washdown, and general transfer. Before ordering in volume, pull a worn impeller and confirm the 2-1\/4 inch outer diameter and 1.9 inch width match your housing.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is MC97?\u003c\/summary\u003e\n    \u003cp\u003eMC97 is the flexible nitrile compound Johnson Pump uses for its marine raw-water impellers. It's the rubber the vanes are molded from, chosen to flex and recover thousands of times while it moves water through the pump.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow many impellers come in the pack?\u003c\/summary\u003e\n    \u003cp\u003eTwenty. This is a bulk pack meant for shops, boatyards, and fleets, so the impellers ship in bulk rather than individual retail packaging.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes the pack include a cover gasket or o-ring?\u003c\/summary\u003e\n    \u003cp\u003eNo. This is impellers only, 20 of them. If your service calls for a fresh pump cover gasket or o-ring, keep those in your kit separately.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I replace a raw-water impeller?\u003c\/summary\u003e\n    \u003cp\u003eMost techs swap raw-water impellers at least once a season, or on the engine maker's recommended hour interval, whichever comes first. Changing before failure is a lot cheaper than an overheat, and with 20 in the box you've got no reason to stretch one past its life.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I run the pump dry?\u003c\/summary\u003e\n    \u003cp\u003eNo. The water is what keeps the vanes cool and lubricated. Run an F6 pump dry even briefly and you can shred an impeller in seconds, so make sure the seacock is open and the system is primed before you spin it up.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the exact dimensions?\u003c\/summary\u003e\n    \u003cp\u003eThe impeller measures 2-1\/4 inches (57.1 mm) across the outer diameter and 1.9 inches (48.2 mm) wide, with a splined bore that drives off the pump shaft.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know an impeller is worn out?\u003c\/summary\u003e\n    \u003cp\u003ePull the cover and look at the vanes. Cracks at the base, torn or missing tips, a permanent curl or flat spot, or a gummy, swollen feel to the rubber all mean it's done. If you find black rubber flakes downstream, an impeller already came apart and you'll want to clear those bits out of the cooling circuit.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eShould I pull the impeller for winter storage?\u003c\/summary\u003e\n    \u003cp\u003eSome owners pull the impeller and bag it so the vanes don't take a permanent set sitting bent in a dry housing all winter. Others leave it in and replace it at spring commissioning. Either approach works, and a stack of 20 on the shelf makes the call easy.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWho is the 20-pack for?\u003c\/summary\u003e\n    \u003cp\u003eRepair shops, boatyards, engine rebuilders, charter fleets, and anyone maintaining a row of boats with F6 pumps. Buying in bulk drops the cost per impeller well below the single-unit price. If you only need one for a single seasonal service, this probably isn't the pack for you.\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 F6 MC97 Flexible Impeller, Bulk Pack of 20\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\u003e812BT-1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e729321032414\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003e812BT1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eImpeller Series\u003c\/th\u003e\n\u003ctd\u003eF6\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eMC97\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003e2-1\/4 in (57.1 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eWidth\u003c\/th\u003e\n\u003ctd\u003e1.9 in (48.2 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDrive Type\u003c\/th\u003e\n\u003ctd\u003eSplined bore\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eImpeller Type\u003c\/th\u003e\n\u003ctd\u003eFlexible raw-water impeller\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFits Pump Series\u003c\/th\u003e\n\u003ctd\u003eJohnson Pump F6\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSold As\u003c\/th\u003e\n\u003ctd\u003eBulk (no retail packaging)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eKeystone Part Number\u003c\/th\u003e\n\u003ctd\u003eJHP812BT1\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 pumps does the 812BT-1 impeller fit?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's the flexible impeller for Johnson Pump F6 series pumps, used for raw-water engine cooling, washdown, and general transfer. Before ordering in volume, pull a worn impeller and confirm the 2-1\/4 inch outer diameter and 1.9 inch width match your housing.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is MC97?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"MC97 is the flexible nitrile compound Johnson Pump uses for its marine raw-water impellers. It's the rubber the vanes are molded from, chosen to flex and recover thousands of times while it moves water through the pump.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How many impellers come in the pack?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Twenty. This is a bulk pack meant for shops, boatyards, and fleets, so the impellers ship in bulk rather than individual retail packaging.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does the pack include a cover gasket or o-ring?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. This is impellers only, 20 of them. If your service calls for a fresh pump cover gasket or o-ring, keep those in your kit separately.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How often should I replace a raw-water impeller?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Most techs swap raw-water impellers at least once a season, or on the engine maker's recommended hour interval, whichever comes first. Changing before failure is a lot cheaper than an overheat, and with 20 in the box you've got no reason to stretch one past its life.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I run the pump dry?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. The water is what keeps the vanes cool and lubricated. Run an F6 pump dry even briefly and you can shred an impeller in seconds, so make sure the seacock is open and the system is primed before you spin it up.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What are the exact dimensions?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The impeller measures 2-1\/4 inches (57.1 mm) across the outer diameter and 1.9 inches (48.2 mm) wide, with a splined bore that drives off the pump shaft.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I know an impeller is worn out?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Pull the cover and look at the vanes. Cracks at the base, torn or missing tips, a permanent curl or flat spot, or a gummy, swollen feel to the rubber all mean it's done. If you find black rubber flakes downstream, an impeller already came apart and you'll want to clear those bits out of the cooling circuit.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Should I pull the impeller for winter storage?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Some owners pull the impeller and bag it so the vanes don't take a permanent set sitting bent in a dry housing all winter. Others leave it in and replace it at spring commissioning. Either approach works, and a stack of 20 on the shelf makes the call easy.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Who is the 20-pack for?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Repair shops, boatyards, engine rebuilders, charter fleets, and anyone maintaining a row of boats with F6 pumps. Buying in bulk drops the cost per impeller well below the single-unit price. If you only need one for a single seasonal service, this probably isn't the pack for you.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Johnson Pump","offers":[{"title":"Default Title","offer_id":44788439416925,"sku":"2007376","price":630.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_70dbbd29-7d06-4b99-9a93-d00f2b294257.jpg?v=1785017738","url":"https:\/\/nvnmarine.com\/products\/johnson-pump-f6-mc97-impeller-20-pack-812bt-1","provider":"NVN Marine","version":"1.0","type":"link"}