Old 57 Johnson 10 h.p. cooling problem

tcast

Recruit
Joined
Aug 31, 2001
Messages
2
I'm a what you call a newbie new used boat/motor etc.... pretty much new parts on everything coil, point,plugs, wires, condenser,impeller. took boat and motor, appears to run sweet but notice at low rpm to middle it discharging water just fine and not hot coming out, but at full throttle less much less water comes out it hot, whats up please need help doing more work than fishing.
 

Dhadley

Supreme Mariner
Joined
Feb 4, 2001
Messages
16,978
Re: Old 57 Johnson 10 h.p. cooling problem

I noticed you said you changed the impeller. Did you change the housing also? If not I would start there and then consider changing the head gasket and thermostat.<br /><br />Good luck!
 
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