Water Pump Impeller Replacement
Boat water pump impeller replacement for outboards, MerCruiser and Volvo Penta sterndrives, and inboards, done at your dock or marina.
Ethan, the owner and mechanic, answers the phone · Open 7 days a week
- Outboards, sterndrives, and inboards
- At your dock or marina
Water Pump Impeller Replacement at Your Dock
The water pump impeller is a small rubber part that keeps the whole engine cool. When it wears out, the engine overheats, and in salt water that can mean serious damage. We replace impellers on outboards, sterndrives, and inboards where your boat is kept.
Trusted by boat owners across South Florida
Read our Google reviewsNo call center. No front desk.
When You Call, the Owner Picks Up
Every call goes straight to Ethan, the owner of EG Marine Services and the mechanic who does the work. There’s no receptionist taking a message and no waiting on a callback from someone who’s never seen your boat.
Tell him what’s going on: the alarm on the display, the noise at idle, the engine that won’t turn over. Ethan knows Yamaha, Suzuki, Mercury, and the rest of what runs in South Florida inside and out, so you’ll usually get a straight answer on the first call, whether that’s something you can check yourself or a visit to your dock.
- Straight answers, not a script
- Diagnostic questions answered on the phone
- Honest advice, even when the fix is simple
- The person you talk to is the one who shows up
Ethan
Marine mechanic
Describe what the boat is doing and get a real answer from the mechanic, not a message taker.
Call Ethan: 786-351-5363Open 7 days a week
Weak tell-tale or engine running hot? Call Ethan before it overheats.
Call 786-351-5363Why Impellers Fail
- Age: rubber dries out and cracks, even if the boat rarely runs
- Running dry: starting the engine out of the water, or with a closed seacock
- Sand and debris: shallow water and running aground chew up the vanes
- Sitting: vanes take a set and stop pumping well
Impellers We Replace
Outboard water pumps
Yamaha, Mercury, Suzuki, and Honda outboards. We drop the lower unit, replace the impeller and the wear parts in the pump kit, and check the water passages.
MerCruiser sterndrives
Alpha One and Alpha Gen II drive water pumps, and the engine-mounted raw water pumps on Bravo setups.
Volvo Penta and inboards
Volvo Penta sterndrive and inboard raw water pumps, including belt-driven pumps.
Signs Your Impeller Needs Replacing
- Weak or no tell-tale stream
- Temperature gauge climbing
- Overheat alarm
- Steam or hot exhaust
- More than a year since the last impeller change
Real Impeller Jobs
Burnt impeller on a low-hour Yamaha
A 2019 Yamaha with 150 hours in six years. The owner thought low hours meant no service, and the impeller was burnt.
Impeller pieces in the cooler
A MerCruiser that kept overheating had an old failed impeller. Its pieces were packed tight inside the cooler and had to be cleared out before the engine would run cool.
MerCruiser 5.0
A burnt water pump impeller replaced and the cooling system checked.
Related Services
- Boat engine overheating repair
- 300 hour service, which includes the water pump
- MerCruiser repair
From the Job Log
Destroyed impeller in an outboard water pump housing 
Raw water pump and hoses on a boat being serviced 
Corroded old engine thermostat next to a new one
Replace Your Impeller Before It Fails
Call with the engine model and when the impeller was last changed.
Call Ethan directly786-351-5363Open 7 days a week · No call center or front desk, you talk to the person doing the work
- Outboard water pump service
- MerCruiser Alpha and Bravo impellers
- Inboard raw water pumps
- Cooling system check included
Prefer a free quote?
Leave your number and we’ll call you back.
Water Pump Impeller Replacement FAQs
How often should a boat impeller be replaced?
Most manufacturers call for a new water pump impeller every year or every 100 to 300 hours, depending on the engine. In South Florida, change it at least every year or two even if the boat barely runs, because rubber impellers dry out, crack, and take a set from sitting.
How do I know my impeller is bad?
A weak or missing tell-tale stream on an outboard, a rising temperature gauge, or an overheat alarm. On inboards and sterndrives, watch for a temperature that climbs at idle or under load.
How much does impeller replacement cost?
It depends on the engine. Outboard impellers are in the lower unit, and the gearcase has to come off to reach them. MerCruiser Bravo engines use an engine-mounted raw water pump. Alpha drives have the pump in the drive, so the drive comes off. Call with your engine and you’ll get a quote.
Where is the impeller on a MerCruiser?
On Alpha drives, the water pump is in the outdrive. On Bravo setups, the raw water pump is on the engine itself. We’ve seen a drive pulled by someone looking for a Bravo impeller that was never there.
What happens if an impeller fails?
The engine overheats, and broken vanes travel into the cooling system. We’ve found coolers packed with old impeller pieces. Every vane has to be found and removed, or the engine keeps running hot.
Areas We Serve
Our mobile marine mechanics travel to marinas, private docks, and waterfront homes from Boca Raton to Islamorada. Nearby but not listed? Reach out to confirm availability in your area.