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Old 06-17-2018, 11:00 AM
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Default Fixing a Mercury Outboard water pump



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I purchased an 18 yr old fishing boat last year. My wife and I just got the time to play on the lake yesterday. https://www.survivalistboards.com/sho...290&highlight=

The motor starts and runs great, but the it does not pee freely. It has a small tell tale port on the right side that only dribbles water, not squirts water. I strongly suspect my water pump impeller need replacement. I will also check for insect nests.

How hard is that?

What's involved?
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Old 06-17-2018, 11:42 AM
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Default not a hard job to replace the impeller,

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Originally Posted by Hick Industries View Post
I purchased an 18 yr old fishing boat last year. My wife and I just got the time to play on the lake yesterday. https://www.survivalistboards.com/sho...290&highlight=

The motor starts and runs great, but the it does not pee freely. It has a small tell tale port on the right side that only dribbles water, not squirts water. I strongly suspect my water pump impeller need replacement. I will also check for insect nests.

How hard is that?

What's involved?
drop the foot and go. pay attention to retorque. if the boat is a salt water use boat, or has been check the tube running up as well. ive had those pin hole. lube the impeller for install. . always before starting spin those props by hand before starting. always flush the waterside out when returning from river or lake, those rubber impellers have a bad habit of sitting for a couple of years, impeller sticks to pump cavity, and first start rips em apart. Pay attention to plate alignment and be careful not to snap any bolts. Ive done some, for the right price, at the boat landing before. careful when you drop the foot, oil is expensive and check the level anyway. hardest part getting the shaft back in the spline just be gentile and breathe dont get in a hurry.

here i always leave the water test clamp over the inlet screen and plug the hose hookup.dirt daubers are not your friend and will build inside in a heart beat.
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Old 06-17-2018, 11:46 AM
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Default also, does it pee when revved up and dribble at idle or dribble no matter

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Originally Posted by Hick Industries View Post
I purchased an 18 yr old fishing boat last year. My wife and I just got the time to play on the lake yesterday. https://www.survivalistboards.com/sho...290&highlight=

The motor starts and runs great, but the it does not pee freely. It has a small tell tale port on the right side that only dribbles water, not squirts water. I strongly suspect my water pump impeller need replacement. I will also check for insect nests.

How hard is that?

What's involved?
where throttle is positioned?
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Old 06-17-2018, 12:11 PM
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The motor only produces a dribble at all throttle positions, even when the wife was driving the boat fast.
I just poked a Q-Tip shaft into the hole, and hit an obstruction. It seemed like it was plugged.
I have issues with mud dobbers here, so I'll retest the motor before pulling things apart.

My plan is to purchase a service manual for the motor first.
Then test the motor again.
Then replace the impeller if needed.
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Old 06-17-2018, 12:57 PM
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Just lowered the motor into my 55 gal test drum if water, and ran it while keeping the water port clear.
No steady stream.
In fact, after about five minutes of running fast idle, while in neutral, a loud warning buzzing came out of the consul.
I'm assuming that was the high temp warning buzzer I've read about.
I shut down the motor and its time to fix the pump.

After watching a repair video, it looks not much harder than changing my oil.
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Old 06-17-2018, 01:25 PM
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mud daubers is the first thing to check. Run a piece of ss. mechanic's wire in the pee hole and see if that opens things up.

That will probably clear it, but the next thing is a very easy removal of the thermostat. see if it is clogged up with crap, mud or grease from the last guy that overlubed the water pump impeller when installing it. Also check that it is not corroded and opens at the right temp.

If all else fails, drop the lower unit and replace the water pump impeller. Just google the motor you have and water pump replacement and it should give you the procedure somewhere.

Or you can check on the "iboats.com" website.

On my 50 Hp none of that is difficult. But there is a trick to unhooking the shift linkage.
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Old 06-17-2018, 01:37 PM
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Ive had to replace the feed line due to those damn daubers, had em pack one i was working all the way up to and including the power head. attention to detail with the water pump. thats the key. other than that, not much harder than changing a oil filter.
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Old 06-17-2018, 02:24 PM
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Ditto , the Shift linkage is important , there are really fun how to videos on you tube that are by regular guys and informative guides to diy ...
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Old 06-17-2018, 02:31 PM
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Ok, guys, please, im about to tear a stomach muscle from cringing and laughing about mechanics wire and pee holes. If any of yall were in the navy and visited the PI in the late 70s, early 80s, you would know how the mandatory VD checks were done, lmao but cringing at the same time.
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Old 06-17-2018, 04:25 PM
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Ok, guys, please, im about to tear a stomach muscle from cringing and laughing about mechanics wire and pee holes. If any of yall were in the navy and visited the PI in the late 70s, early 80s, you would know how the mandatory VD checks were done, lmao but cringing at the same time.
YEA, THAT BIG STAINLESS NEEDLE,with the pop out umbrella....... shove it in, drag it out.......... done Olongapo right............
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Old 06-17-2018, 09:10 PM
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Some places were off limits just because they didnt want ya breathin the air from across the street, lol
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Old 06-18-2018, 11:22 AM
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If you are planning on using the boat in any type of remote situation I would replace all that stuff. My dad had a 25hp Merc that was missing a fin or two and luckily made it back home after a trip to Canada. Pretty cheap/easy for peace of mind.

This should be the video you need for your 90hp motor:
https://www.youtube.com/watch?v=BiQNhFYFvdQ
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Old 06-20-2018, 06:32 AM
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I would change all the fluids as well as the impeller....as well as repack the bearings on the trailer.

I just changed my impellor a few weeks ago and the hardest part is alway lining up the shift shaft. There are some great videos to watch prior to starting the project.
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Old 06-20-2018, 07:26 AM
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I used to carry a 1 foot piece of heavy duty weed whacker line in the boat. Poked it in the pee hole as I put the boat on the trailer, pulled it out when I launched. Never had a dirt dobber nest there, but they did plug up the bilge pump once.

The impeller was rubber, and didn't look too hard to replace, although I never had to do it. I was told that the usual failure came from running the motor with no water flowing through it, like on the driveway while cleaning the rig.To do that, I always used "mickey mouse ears".

My motor was a 2002 Mercury 115.

WW

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Old 06-20-2018, 04:00 PM
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I just ordered a manual and rebuild kit for the water pump.
Replaced the tires on the boat trailer. I'll re pack the bearings as well.
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Old 07-04-2018, 07:50 PM
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I spent the last three weeks working on my new house, but today is the 4th so I spent the day fixing the water pump for my boat.

It took some time to shake loose the lower unit after unbolting it.
After that, it took ten minutes to repair the pump.
I tested it and the pump works now.

The manual recommended shifting the motor into fwd, before dropping the lower unit.
This made it easy to realign the drive shaft spline when reinstalling it.
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Old 07-04-2018, 08:00 PM
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Quote:
Originally Posted by Hick Industries View Post
The manual recommended shifting the motor into fwd, before dropping the lower unit.
This made it easy to realign the drive shaft spline when reinstalling it.
Did you change the gear lube in the lower unit?
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Old 07-04-2018, 09:35 PM
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Did you change the gear lube in the lower unit?
Not yet, that's still on the list of this to change on this older, but new to me boat.
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Old 09-30-2018, 08:37 PM
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Mercury (Force, Mariner, Mercruiser) recommends that the impeller be replaced every 3 yrs or 300 hrs of use.
We have more impeller problems from motors sitting for 6+ months than from wearing out.
The older, smaller units have stiff rubber impellers that stay bent and are less efficient.
Newer units tend to use softer, more flexible impellers.

Gear lube should be replaced yearly. Check condition/ color of lube .If it is milky you have a leaking seal.

It is common for the Tell Tale ( **** tube) to become clogged. We backflush it with compressed air. Usually loosens the obstruction and allows water to flow once again.
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Old 10-01-2018, 09:28 AM
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1. Check for blockage in the tube (which you found one)
2. Make sure water is reaching the block by removing the thermostat (I doubt it is from your description)
3. Check the water pump impeller after removing the gearbox.
4. Check the transfer pipe and inlet grates.

Having someone else do all this for you will probably run you about $800. Instead of being specific, tell them you need a seasonal tune-up and that you've had issues with dobbers in the past. It will probably cost you about $300 less if it's just a tune-up. At least then, if there is a part failure, they will call you and tell you what needs to be replaced. From the info you got on this thread, you know what those parts could be.
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