Hardin Marine stainless steel replacement for Merc seawater pump

Black_Diamond

NAPA

aero3113

I just received the sealant from Amazon, wish I had it for this past weekend with the nice warm weather!

aero3113

Pumps are ready to go in. While they were out, I had the brackets sand blasted and powder coated. I was going to spray paint them myself but figured since there’re so low on the engine it will prevent future rust.

YYZRC

You should start a business doing this stuff as turn-key replacements. I would buy

aero3113

@YYZRC , I would love to start a business. It’s tough though with my full time job, a 6 month old and a 2 1/2 year old! Today I was up at 3:15 am for a 5:00 departure for one of the planes I look after. Came home took a 2 hour nap, then my wife went to work. Luckily my 2 1/2 year old is at day care today and I was able to put the pumps together when the 6 month old took a nap! 

davidbrooks

@aero3113 is it a weep hole or to use with an awl or allen wrench to lock the shaft if you have to remove the pulley? See if it lines up with a hole in the shaft.

LaRea

@aero3113 are those quick-release fittings on the hose ends?  Where did you get them?  How well do they work?  

LaRea

BTW since you made those pumps so pretty, they deserve a set of stainless steel drain plugs.  Only $6 each.

aero3113

@davidbrooks , it’s possible it’s there to lock the shaft. One pump I see stainless with a flat spot In the hole and the other is open.

aero3113

@LaRea , yes there quick release fittings. They were installed on the boat already. I would think they were original to the boat. They seem to work pretty well. 

When I first started working on the boat I replaced all of the blue plastic plugs with new plastic ones. A few weeks later I saw the Hardin stainless ones. In a couple of seasons I’ll probably replace them with the stainless ones.

LaRea

The quick release is a smart idea.  If anybody can recommend a source, I'm interested.  I have some old injuries that make it really hard for me to reach those hose clamps.  

aero3113

The quick release are only on the inlet sides. I’m guessing the suction helps keep a good seal.

aero3113

@LaRea , #5 and #6 in this diagram. There is also a quick disconnect at the transom also if you want to install that too (you don’t have to, not sure why it’s there?) If you do you will need an extra #5 and a #7.

It says for a 4.5L MPI but would think it’s the same part for all engines. At least you have part numbers you can research and see. Reasonable price too!!

http://www.mercruiserparts.com/bam/subassembly/31531/16591/160

aero3113

@LaRea , #5 and #6 in this diagram. There is also a quick disconnect at the transom also if you want to install that too (you don’t have to, not sure why it’s there?) If you do you will need an extra #5 and a #7.

It says for a 4.5 EFI but would think it’s the same part for the bigger engines also. At least you have part numbers you can research and see.

http://www.mercruiserparts.com/bam/subassembly/31531/16591/160

aero3113

Sorry for the double post!

Dream_Inn

Yes, if you have the red hose it is quick release.  They work pretty well and was, for once, a good idea!

aero3113

I installed both of my pumps today. Inspect your hose clamps!! This was the port side outlet hose clamp. The other half was ready to break at any time!

LaRea

Good catch, and good advice.

aero3113

If this clamp broke on a long trip and the hose came off, how would I know being it’s the outlet side of the pump? Would I still lose water pressure?

LaRea

Yes, you'd lose water pressure.  I think you'd get fault code 23, Sea Pump PSI Lo. The engine would throw a constant alarm horn and go into limp mode.  

aero3113

Ok, thanks @LaRea .

reneechris14

Psi sensor is in the power steering cooler right by the dizzy. It would though a code and beep but the water would continue to poor in as that hose is below the water line. After you mentioning this and rasbury bilge filling up i'm thinking high water alarm and a camera.

aero3113

Yea, @reneechris14 . I have a high water alarm installed, have to make sure it’s working when I get the batteries back in.

LaRea

If it ever does happen, umm, it would be best if you are wearing brown pants.

It will spew water like crazy as long as the engine is running.  Probably not so bad after shutting down.  

aero3113

Glad I found it now and not when it failed.

goalie59

Chances are you would just have a small drip, the hoses are very stiff and would not come off , also those hoses tend to glue themselves on and are very hard to remove. Still why take a chance and that was a good find. I just don't think it would do anything but drip. 

Black_Diamond

Those weep holes might just be to allow an air escape path when pressing in the bearings. You can blow the seal out of the opposite bearing otherwise.  

Dream_Inn

LaRea said:

If it ever does happen, umm, it would be best if you are wearing brown pants.

It will spew water like crazy as long as the engine is running.  Probably not so bad after shutting down.  

Yes, I've been there done that.  As a matter of fact, over the 7+ years I've owned this boat, I've had 4 different water hoses come off at one time or another while out in the bay.  & yes, I do check my clamps and have replaced most, if not all at this point.  Luckily I always keep spares.  I will say, in a pinch, the hose clamp on your genny exhaust is plenty large enough for almost all hoses (don't ask me how I know :-:smile:  ).  

aero3113

@Dream_Inn , the generator clamp is a good tip to know. I’ll keep that in mind along with the spares I carry.

rasbury

I guess even ss will corode eventually!