2002 merc 90 pee hole/overheating

mike90

Recruit
Joined
Aug 11, 2008
Messages
2
I replaced the impeller on my motor about three months ago. Recently, I dredged up lot of mud while running a little too shallow. The pee hole was clogged, but after running some heavy fishing line through the hole, the water was coming out as good as ever. The next trip out I had no problems but yesterday, the water flow was a little weak. At the end of the day while pulling back to the dock, I heard what I'm guessing was a heat alarm and the pee hole water was just dribbling out. I don't have any experience with enging mechanics, but is there some simple things I can do on my own to try to resolve this problem before I bring the boat to a mechanic? Thanks for the help.
 

boatfund

Cadet
Joined
Sep 15, 2007
Messages
11
Re: 2002 merc 90 pee hole/overheating

try a blast of air with a air compressor
 
Joined
Jul 10, 2008
Messages
27
Re: 2002 merc 90 pee hole/overheating

if your gonna do air blasts, then make sure you do short ones, mostly just blast it for a second literally.
 

mikeneal

Senior Chief Petty Officer
Joined
Jan 28, 2004
Messages
710
Re: 2002 merc 90 pee hole/overheating

If you got that much thru it there is chance you toasted the impeller.
 

mike90

Recruit
Joined
Aug 11, 2008
Messages
2
Re: 2002 merc 90 pee hole/overheating

Well, I ran some weed wacker line through the pee hole a couple of weeks ago while the boat was on the trailer and it idled okay for about 15 minutes. I'm going to take the boat out this weekend so I'll know soon enough if I've got a problem. Thanks for the replies.
 

achris

More fish than mountain goat
Joined
May 19, 2004
Messages
27,468
Re: 2002 merc 90 pee hole/overheating

mud & sand can destory a impeller in no time flat just replace it.
http://bassboatcentral.com/sttips.htm

That's the old style impellers... These engines have the new 'floppy vane' impellers. They handle sand/silt/mud/weed much better...

Pull the thermostat and clean the mud out of that... Top of the engine above #1 plug.

Chris.......
 
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