How to Change a Mercury Outboard Water Pump Impeller
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- Опубліковано 13 жов 2024
- 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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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.
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!
Excellent video, very helpful. Thank you!
Thanks so much, Darren! We're glad you found the video helpful. If you have any other questions or need more information, feel free to reach out. Happy boating!
Best,
The PartsVu Team
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.
How did you make out?
Did you line up the plastic water tube from the impeller housing into the tube coming down inside the lower cowling? I didn’t see it. Also, on an Optimax 175, is it just the metal plate-then (1) single gasket on top-then the impeller housing? No gasket underneath the metal plate? I did mine presently. From the factory, it had a gasket underneath the metal plate (torn). I have no idea why it would have one there.
Here’s a detailed response for @jgringo5516:
Hi @jgringo5516,
Great question! Yes, it’s important to line up the plastic water tube from the impeller housing with the tube inside the lower cowling. Sometimes, that part can be tricky to see in the video, but it's definitely an essential step.
As for your Optimax 175, you’re correct-the standard setup includes just the metal plate, a single gasket on top, and then the impeller housing. Typically, there's no gasket underneath the metal plate, but if your factory setup had one, it could be for added sealing in certain conditions. If the original gasket was torn, it might have been a previous modification or an extra seal that wasn’t part of the standard spec.
If you’re still unsure, it might be worth checking with a Mercury service manual or reaching out for further confirmation. Hope this helps, and feel free to reach out if you need any more assistance!
Best,
The PartsVu Team
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?
Just did mine, took me 5 minutes
Thats great!😎 See ya on the water!
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?
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!
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!!
Does the engine oil have to be drained for lower unit to come off
No
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.
If you pull off a lower unit and get cover in engine oil you've got some serious issues with that motor.
@@gord1527 it’s certain engines. You clearly haven’t done your research.
It’s clear as day in the video I linked to….
Can bad pump cause an alarm with no codes?
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.