My 84 Mercruiser 140 overheats!

bperry

Recruit
Joined
Aug 18, 2008
Messages
1
I took my boat out for the first trime in 2 years on Sat. It started great but immediately began to overheat. Any ideas where to start?
 

4Winns2

Petty Officer 1st Class
Joined
Nov 2, 2006
Messages
327
Re: My 84 Mercruiser 140 overheats!

When the last time the impeller in the outdrive was replaced?
Thermostat okay? Do you have a service manual for it that you can check a list of probable bad spots for overheating?

Get whatever is causing it fixed. I just blew an inlet water hose and spun my crankshaft bearings which means I'm flipping engines, again.
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,079
Re: My 84 Mercruiser 140 overheats!

Ayuh,....

Change the Impeller in the lower unit.....
 
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