How to Change a Mercury Outboard Water Pump Impeller

This how-to video applies to the following Mercury models:
- Verado L4 Models, 135 - 200 HP
- Verado L6 Models, 200 - 400 HP
- 4-Stroke EFI Models, 40-150 HP
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Frank Cutri (owner and operator of the Platinum Mobile Marine mobile mechanic service) explains a critical part of Mercury outboard cooling system maintenance: impeller replacement.
In this video, Franks shows us:
- Some ways to tell if a replacement is necessary, and how often to perform this service
- How to remove the gear case so that you can access the water pump
- How to remove the housing to access the impeller
- How to replace a Mercury impeller using a water pump repair kit
- How to reassemble everything you've removed
As always, Frank shows us some handy tips & tricks along the way!
For more on the topic, read the guide!
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[@Maynardd]

I’ve seen all these crazy contraptions people build
just to hold the lower unit after people take it out. 55 gallon garbage can! Who knew!? Thanks.

[@partsvu]

Expensive contraptions are not always necessary. That being said, Frank has several years experience with balancing the weight and shape of the lower units he works on!
Happy Boating!

[@sentient8146]

Impeller gone on 2012 150hp and the boatyards are busy as hell here in the salt. I’m gonna give it a shot tomorrow. I hope it goes ok.

[@brianney5475]

How did you make out?

[@alvahilderbrandt]

Just did mine, took me 5 minutes

[@partsvu]

Thats great!😎 See ya on the water!

[@smeg8557]

Hi, I removed my lower unit following your video, mine is the 200HP, when I removed it 4 washers fell out and im not sure where they go, sorry 5 fell out, one is the size of a 50 cent piece and the other 4 are smaller, would you happen to know where they go or how I can find out? Thanks so much!!

[@BigFishPestControl]

I have a 2006 mercury 115 hp two-stroke four-cylinder. I’m looking to replace the impeller and the gaskets like you did the 300 hour maintenance. Is there anything you recommend? I do differently?

[@partsvu]

Hey there,
Most of the processes are the same, with different parts of course. We recommend checking with your owner's manual for your 2-stroke engine!

[@frankevega]

New boater here. Will I need to drain oil first? Hell I have no idea if theres even oil in that section. Or just u bolt everything like you did?

[@jamesc6137]

Does the engine oil have to be drained for lower unit to come off

[@gord1527]

No

[@thooks1234]

YES on many models. I have a 175 Verado and if you don't empty the crankcase, you will get almost 2 quarts of oil all over you.

[@gord1527]

If you pull off a lower unit and get cover in engine oil you've got some serious issues with that motor.

[@thooks1234]

@@gord1527 it’s certain engines. You clearly haven’t done your research.
It’s clear as day in the video I linked to….

[@joeconner2669]

Can bad pump cause an alarm with no codes?

[@partsvu]

Thanks for watching!
Yes, a bad water pump on your Mercury outboard can indeed cause an alarm without triggering any specific error codes. Modern outboard motors are equipped with sensors and alarms that monitor critical functions such as engine temperature and water flow. The water pump in your outboard is responsible for circulating water through the engine to prevent overheating. If the water pump fails or is not pumping water adequately the alarm may not sound. Check for signs of water flow from the tell-tale or pee hole. If there’s no water flow or it’s irregular, the water pump may be failing. Have a qualified marine technician inspect the water pump and replace it if necessary.
Good luck Buddy.