2019 4.5 overheat

bigjscfn

Recruit
Joined
Jun 16, 2020
Messages
1
Saturday took the boat out ran good till i ran into shallow water (i am a rookie) the boat alarmed shortly after and shut down and started overheating towed in next day started up ran fresh water in still heating up no alarm though my manual says 140 op temp im getting 200 is there anything i can do to determine if impeller or how to clean out
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,452
You replace the water pump with a full kit.to start. Then with the drive off you backflush from the therm housing out the back of the transom hose . Now using a hose from a washing machine cut in half ,insert into water inlet and run engine . Temp should hold at normal unless you sucked up enough sand to fill the manifolds
 

tpenfield

Moderator
Staff member
Joined
Jul 18, 2011
Messages
18,477
:welcome: to iBoats . . .

I think this is our first, if not, then one of our first posts about the new Mercrusier 4.5L engines :thumb: Keep up the good work and backflush :thumb:
 
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