Logo
FULL SITE MENU

Merc 90hp 4Stroke Steam out of Tell-Tale

J

jblaloc1

New member
Thanks in advance. I recently changed the water pump on my 2008 Mercury 4Stroke EFI 90hp. Think it all went well, solid stream at all cruising speeds, and the water coming out is warm/cool to touch. Recently I have noticed after running WOT and coming off plane there is steam coming out of the tell-tale for a moment then goes away-have also noticed a slight amount coming from under the cowling. Thinking my engine is mounted too low, and pushing water up into the cowling. Could this be causing the steam issue or am I totally off base, and need my water pump checked out ASAP? There are no alarms and the stream is solid.

Thanks again!!
 
I would think that if you have a good stream and you have no alarms it would be ok.
maybe you have a cavitation problem on decel. And it's sucking air for that brief moment.
As for the water exiting the cowling I would check next time your on the water. See if it's totally wet under the hood.
 
mechanicman said:
I would think that if you have a good stream and you have no alarms it would be ok.
maybe you have a cavitation problem on decel. And it's sucking air for that brief moment.
As for the water exiting the cowling I would check next time your on the water. See if it's totally wet under the hood.
Click to expand...


Thanks for for the advice. That was my thinking also on the impeller/cooling system. I ran it for awhile at just idle and at wake, no steam. So if it is a cavitation problem, how would I know and how do you go about correcting it? Thanks again!
 
Any chance something like a hydrofoil might solve the problem until I can get it raised up?

Just an update. Took it out this morning, stayed at low almost no wake speed, and no steam out of the tell-tale...and obviously no water was splashing up in the cowling. Thinking it may definitely be related.
 
Back
Top