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Water pump/other maintenance?

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Old 05-16-2018, 05:52 PM
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Question Water pump/other maintenance?

Hoping for insight from people with more experience than me.

This season my telltale was weak. Motor is a '99 2 stroke 40hp Mercury (3 cyl.). This is my second year owning the boat, so I'm not sure how long since last water pump maintenance. I decided to replace the impeller, should have ordered the complete water pump kit - the gaskets are all shot and everything just needs to be cleaned up in general. I'm curious if there are any other parts in the lower unit THT brain collective would replace (and order while I'm getting the gaskets) while I have the lower unit off? I've attached some pictures for reference on how everything is looking. I changed the LU oil earlier this year and it looked good/not milky.

Should I replace:
The boot in the first picture?
Orange rubber gasket in second and third pictures?
Seal around the driveshaft at the top of the lower unit?

Looks like I'm not taking the boat out this weekend... Appreciate any advice!

Does this boot need replacing?
The orange rubber gasket thing on the left wasn't on the parts diagram I was looking at. Any comments on that piece?

Seal looks a little worn out,
Disgusting looking gaskets. I think the housing and base plate will be fine once I clean them up.
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Old 05-16-2018, 06:10 PM
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Yes to all. It's cheap insurance and peace of mind.



Last edited by Mud Runner; 05-16-2018 at 06:18 PM.
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Old 05-16-2018, 06:12 PM
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Yes, replace all sift parts including the pump housing. Cheap preventative maintenance.
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Old 05-16-2018, 06:14 PM
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The Orange gasket won't be on any parts diagrams . It's just rtv. I use black, and a heavy bead.
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Old 05-16-2018, 07:31 PM
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Thanks y'all, I'll put my order in tonight. Looking closer at the diagram I think that orange seal was item 2, website has it listed as seal/plate kit. Since I'm placing an order I'll get it instead of using the rtv, mcsd63!

Is it normal for the inside of the lower unit to be that dirty or does this just look neglected?
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Old 05-16-2018, 08:17 PM
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Looks like it was never flushed. As far as that gasket goes, I'd still put some RTV at the edges. Don't over do it though. Good luck.
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Old 05-17-2018, 04:47 AM
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Make sure you replace the grooved stainless steel base plate. The grooves seriously effect the efficiency of the impeller.
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Old 05-17-2018, 05:32 AM
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I would replace everything and have a fresh start. Some vinegar will dissolve those calcium salt deposits and help clean everything up.
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Old 05-17-2018, 09:31 AM
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You have it out. Replace that stuff... It's all pretty straight forward. Just a little time consuming. Be sure not to over-torque and strip out the water pump bolts.

That orange gasket wraps around that metal bar. That whole piece lifts out of there (it's a Mercury thing). That piece can be reused.

When you get done with all of that, replace the thermostat. If it looks that bad down there, you will probably be shocked when you see the thermostat.
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Old 05-17-2018, 01:55 PM
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Originally Posted by duffish View Post
Thanks y'all, I'll put my order in tonight. Looking closer at the diagram I think that orange seal was item 2, website has it listed as seal/plate kit. Since I'm placing an order I'll get it instead of using the rtv, mcsd63!

Is it normal for the inside of the lower unit to be that dirty or does this just look neglected?
now that I look at the diagram again, I think you're right about the plate and seal. Mine doesn't have that from what I can find . Mine had rtv on it when I took it apart , so I put it on there when I put it back together .
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