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Mercury Water pump problems

R

Rob B

Moderator
Staff member
So i take my wife out to the river, it's a nice balmy 72* here today. So everything is all good until i tried to crank the merc. I damn near run the battery down before it fires. The merc took forever to crank sitting in the yard before we even left. To top it all off the water pump quit working again after it was fixed. The alarm goes off and we never left the dock. So back on the trailer and here we are at the house. :brickwall: :mad::pissed: Btw the merc was tuned up, fresh gas and oil.

So what do you merc guys do when it all goes wrong?
 
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sounds like i would be talking to that mechanic cuz that isnt right, i have tons of mercs at my marina and i dont have that problem something is wrong
 
Sounds like a weak fuel pump or spark. It should fire off if you have both. As far as the coolant problem. They may have not gotten all the old impeller out of the tube running up from the lower unit.
 
175checkmate said:
Sounds like a weak fuel pump or spark. It should fire off if you have both. As far as the coolant problem. They may have not gotten all the old impeller out of the tube running up from the lower unit.
Click to expand...

175 I'm the one who changed the water pump. Everything seemed fine after that and then all of a sudden it quit pumping water again today. This is after letting the motor sit there and run for a while. I also changed both t-stats. Could it be possible something got it clogged up somewhere?

The cranking problem just started, before it used to fire right up. I've got hit w/ a double whammy today. Can you tell i'm frustrated?:brickwall:
 
on the water pump make sure blades are set in the right direction, make sure the plastic tube is on it make sure the copper tupe going up is in place and that they go together, make sure the upper didnt melt, make sure there is no debri in tube, it looks like there wouldnt be.

water pumps can be easy but experience is priceless.

was the moter pissing water out the by bass
 
Dang, I was so hoping to hear about a great day on the water :shakehead: That sucks! Sorry to hear that. I've experienced every one of those problems on past boats. ALL boat motors will give you problems, no matter what the brand. Age and sitting kill them all.

On a brighter note for you, I got the Pulse out of storage and put it in the garage today :surf: What a major undertaking. So I'm one step closer to starting the 'depth sounder removal project' and my 'Bimini Top installation project'. :D

Let that motor sit until you're not mad at it anymore, then start tinkering with it. Or drop 15 grand on a new ETEC 150 :p
 
Whoa, looked at that water pump pic!
How long have you owned the motor? That impeller is cooked from being run without water. If the engine overheated, you've got big problems internally. Do you know if it did or not?
 
Like you said ...It's 72 degrees and balmy. Tonight here it's going down to minus 24 degrees ACTUAL w/ minus 60 windchill. I'd take those troubles right know....
 
Did you install the impeller the proper way? On some models you can get the impellar turned backwards.

It's easy to install it backwards. The other pitfall can be if you don't get the tube coming out of of the lower unit/waterpump seated correctly in the tube which runs up to the block.
 
Mark said:
Whoa, looked at that water pump pic!
How long have you owned the motor? That impeller is cooked from being run without water. If the engine overheated, you've got big problems internally. Do you know if it did or not?
Click to expand...

Mark i just bought the boat back in October, 07. Everything checked out at the dealership. Unless i was lied to. My step dad seems to think the water tube came loose that goes up to block. I'll pull the LU in the morning and take a look. I've calm down now so i can think a little clearer.:D
 
Chris said:
Did you install the impeller the proper way? On some models you can get the impellar turned backwards.

It's easy to install it backwards. The other pitfall can be if you don't get the tube coming out of of the lower unit/waterpump seated correctly in the tube which runs up to the block.
Click to expand...

Chris after the installation i was getting strong pressure then it quit. I found out I had a bad t-stat so i replaced both of them. Then everything seem fine again until today.:confused:
 
JW said:
Dang, I was so hoping to hear about a great day on the water :shakehead: That sucks! Sorry to hear that. I've experienced every one of those problems on past boats. ALL boat motors will give you problems, no matter what the brand. Age and sitting kill them all.

On a brighter note for you, I got the Pulse out of storage and put it in the garage today :surf: What a major undertaking. So I'm one step closer to starting the 'depth sounder removal project' and my 'Bimini Top installation project'. :D

Let that motor sit until you're not mad at it anymore, then start tinkering with it. Or drop 15 grand on a new ETEC 150 :p
Click to expand...

I was so looking forward to today as well. I guess crap happens to everyone. Cool i would like to see the bimini on the boat once you've installed it.
I'll save the 15 grand and fix this one,now that I'm calm once again.:thumb:
 
Even if the tube was unattached at top, the impeller would still be fine as long as it is getting water. So first off, you know that the engne was run out of the water...that is the only time an impeller will look like that.
Secondly, having read your previous post it looks like unfortunately your engine overheated several times. So though I would normally be looking at fuel and electrical for you symptoms in post #1...you may have to look deeper. Does anyone know how to check if it has been damaged internally without pulling a head?
I really hope I'm wrong, but what do you other guys think?
 
Mark said:
Even if the tube was unattached at top, the impeller would still be fine as long as it is getting water. So first off, you know that the engne was run out of the water...that is the only time an impeller will look like that.
Secondly, having read your previous post it looks like unfortunately your engine overheated several times. So though I would normally be looking at fuel and electrical for you symptoms in post #1...you may have to look deeper. Does anyone know how to check if it has been damaged internally without pulling a head?
I really hope I'm wrong, but what do you other guys think?
Click to expand...
got to remember without water going through the exhaust the exhast gas will come down and burn impeller housing and etc. even if the water pump pumps there has to be water cooling exhaust or it will burn stuff up also like the plastic tube etc.

internal damage just check it with a compression or do a cyl leak down test
compression is simple to check and is a good way to check without pulling a head.
 
I thought with mercs you had to put them away and forget about d'em for 6 months a year and you won't have any proplems.At least thats what I've always done. LOL:rof:


Sorry about your troubles.
 
smallblockford said:
got to remember without water going through the exhaust the exhast gas will come down and burn impeller housing and etc. even if the water pump pumps there has to be water cooling exhaust or it will burn stuff up also like the plastic tube etc.

internal damage just check it with a compression or do a cyl leak down test
compression is simple to check and is a good way to check without pulling a head.
Click to expand...

The compression was 130 checked by the dealer. I'll comfirm that this morning since i wasn't standing right there when the dealer tested the motor . Second when i changed the t-stats my step-dad noticed the heads were replaced. So Mark might be on to something. My question to you guys is how all sudden i'm getting these problems? I took the boat to the river and tested before I bought it.

Merc thanks for the laugh...:D
 
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