ImpelPro Large Impeller Puller for Big Marine Impellers
A bearing-driven impeller removal tool for big marine impellers in pumps with no room to work.
Fits flexible-vane impellers 2-9/16" to 4-5/8" on inboard marine engines and generators, measured tip to tip across the vanes. Works with as little as 6.2" of clearance in front of the pump.
Nine teeth bite into the hub, and a patented bearing keeps the tool centered while you wind even a big, stuck impeller out with one hand and a 9/16" wrench. The pump stays on the engine.
Backed by a 7-year limited warranty. Orders are processed within 1 business day.
Not compatible with outboard motors. Not sure of your size? Look up your impeller part number.
Quantity
Built for big pumps in tight spots
Bigger engines don't come with more room. On twin diesels, sportfishers and workboats, the raw water pump is often wedged against a stringer or hidden behind a filter. The impeller is long, it's been spinning in there all season, and it doesn't want to come out.
This is the job that eats a whole afternoon. Screwdrivers chew up the vanes, the impeller comes out in pieces if it comes out at all, and sooner or later someone says the pump has to come off.
Ted W. spent a day on a Volvo Penta TAMD 75 and got the impeller maybe 30% of the way out. With the Large, Ted "had the impeller removed within 30 seconds." The full review is below.
The Large is sized for that work, with nine teeth on the hub and 6.2" and 7.2" rods for pumps that sit deeper. Snug the arms onto the hub with the knurled thumbscrew, by hand. Put a 9/16" wrench on the hex nut at the top of the threaded rod and turn. The rod works against the pump shaft, the teeth grip harder as the load builds, and the impeller winds out, steady and controlled.
Philip B., on the boat's Cat C18 impellers: "They came out effortlessly!" Mariano P. uses it every season on four pumps: main engine, washdown, genset and RSW.
The Large is the original ImpelPro. Eddie Protzeller, a tugboat and yacht mechanic for 15+ years, once spent two or three hours on a seized impeller in a Scania 6SY and finally cut the vanes off by hand to get it out. That job is why ImpelPro exists, and the Large is the first tool he built.
Who it's for
Boat owners with bigger engines. Twin diesels and big gensets need seasonal service too, and you don't have to wait for a yard slot to do it. If it's your first time, the how-to video walks you through every step.
Captains and sportfishers. Impellers don't pick a convenient time to fail, and the temperature alarm is usually the first to tell you. With a spare impeller and the Large in your kit, you can change it at the dock or out on the water instead of calling for a tow.
Workboat and fleet operators. A boat waiting on a pump job isn't earning. With the Large, one crew member and a 9/16" wrench can change the impeller without taking the pump off. It covers engine raw water, generator, RSW, washdown and transfer pumps in its size range, so one tool can handle several pumps on the same boat. See ImpelPro for Marine Professionals.
Marine mechanics. Designed by one, for the big pumps that take the longest. It gets the impeller out without chewing up your customer's housing.
Why it works
- Nine teeth on the hub. They bite into the hub itself, so the tool doesn't have to reach under the end of a long impeller to catch it.
- A patented, bearing-driven design. The bearing keeps the puller centered on the shaft and gives you the leverage to wind a big impeller out with one hand. No yanking, no prying.
- Reach for deeper pumps. Comes with a 6.2" medium rod and a 7.2" long rod.
- Billet aluminum and stainless. The arms and strong back are machined out of a solid piece of 6061-T6 aluminum, called billet. The threaded rod is 316L stainless steel. Both resist corrosion around salt water.
- Fits keyed, threaded and splined shafts.
Specs and compatibility
- Impeller size: 2-9/16" to 4-5/8", measured tip to tip across the vanes, not across the hub. If yours is exactly 2-9/16", get the Standard instead.
- Clearance needed: 6.2" minimum
- Rods included: 6.2" medium rod and 7.2" long rod
- Teeth: 9
- Body: 5.0" tall, 3.0" strong back, 1.5" thumbscrew
- Weight: 16 oz
- Tools: 9/16" wrench or socket on the hex nut at the top of the threaded rod. The thumbscrew is hand-tighten only.
- Pumps: any flexible-vane impeller pump in this size range, including inboard engine raw water pumps, generators, and RSW, washdown and transfer pumps
- Shafts: keyed, threaded and splined
- Not compatible with outboard motors
- Materials: 6061-T6 billet aluminum, machined from solid, and 316L stainless steel
- Origin: Made in USA of US and imported parts
- Patent: U.S. Patent No. 12,467,478
- Warranty: 7-year limited warranty
- In the box: puller body, knurled thumbscrew, medium rod, long rod. Instructions and videos are on the QR code printed on the package.
Look up your impeller part number and see full specifications
How to use it, step by step
Warning California Proposition 65 This product can expose you to chemicals, including nickel, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov
Need the other size?
If you have smaller pumps on board too, the ImpelPro Standard fits 1-9/16" to 2-9/16" impellers. It has six teeth and a 4.2" short rod for the tightest spots. Shop the ImpelPro Standard.
Before your first job
- Have a new impeller ready. The teeth bite into the hub to get their grip, so the old impeller is done once it's out.
- Measure tip to tip across the vanes, not across the hub. That number picks your size.
- Tighten the thumbscrew by hand only. Pliers, vise grips or a wrench on the thumbscrew, strong back or arms can damage the tool, and it voids the warranty. Your 9/16" wrench goes on the top nut only.
- Watch the how-to video once before you start, and pay close attention to the centering step. If the tool sits off-center, it won't wind the impeller out and it can damage the tool.
Common questions
Which size do I need?
Measure your impeller tip to tip across the vanes. 1-9/16" to 2-9/16" takes the Standard. Over 2-9/16", up to 4-5/8", takes the Large. If you can't get to it yet, look up your impeller part number on our compatibility list.
Will it work on my engine?
It goes by the pump, not the engine brand. If your pump uses a flexible-vane impeller in this size range and you have at least 6.2" of clearance, the Large will fit. Search our compatibility list by impeller part number to be sure.
Does it work on generators, washdown and RSW pumps?
Yes, as long as the pump uses a flexible-vane impeller in this size range. That includes inboard engine raw water pumps, generators, and RSW, washdown and transfer pumps. It doesn't work on centrifugal, gear or diaphragm pumps.
Can I reuse the impeller after I take it out?
No. The teeth bite into the hub to grip it, so plan on a new impeller. ImpelPro recommends a new one every 100 hours, every season, or on your manufacturer's schedule, whichever comes first.
What tools do I need?
Just a 9/16" wrench or socket for the top nut. The thumbscrew tightens by hand.
What's the warranty?
7 years, limited, against defects in materials and workmanship. See the full warranty policy.
ImpelPro Policies
About This Video
Watch the ImpelPro Large Impeller Puller wind a worn impeller out of the raw water pump on a Cummins 5.9 marine diesel. A hose runs right across the front of the pump, and the pump stays on the engine the whole time.
Video description (music only, no narration): The video opens on the raw water pump with the cover off and a hose crossing in front of it. Eddie sets the puller on the impeller hub and tightens the knurled thumbscrew by hand. A socket on the top nut winds the threaded rod against the pump shaft, and the impeller winds out of the housing. The video ends on the old impeller, still gripped in the tool, with its vanes torn up.