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74 Bravo one Overheating

T

teltcity_boater

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"I have a 1994 7.4 Bravo One t

"I have a 1994 7.4 Bravo One that overheated yesterday. Ran across the lake fine 160-170, then when i went to idle, immediatly the temp started climbing. Got in water and made sure the the water intakes were clear. (boat is docked all summer) Sat for awhile to let cool off and try again, cooled to below 160 started and it started heating up right away. Had to be towed to dock. I have not done anything yet. I reviewed the manual I have and figure: 1 termostat, 2 seawater pump, 3 circulating pump, or clogged hoses or lines.
Im going up tomorrow and check out. Im going to check the seawater pump first, by taking the hose off to the termostat and seeing if i have flow after cranking. I should have flow right?? If thats ok ill take the termastat out and check on stove. am I going about this right??? any input of thoughts would be greatly appreciated.... James"
 
"You can briefly run it into a

"You can briefly run it into a bucket from the hose to the stat housing. At 1000 rpm you should fill a bucket in 10-15 seconds.
If not, check your sea strainer if equipped.
Tho your pickups may be clean you could have varmints building a home in the pickyup inlet area or hose.
If no water flow and all else is clean, likely your belt driven pump is toast.

Rod"
 
"Rod,
I went and checked toda

"Rod,
I went and checked today, and it is the impeller, it was so tore up that the pulley on the pump would not turn. Without the impeller attached, when I turn the pully there seems to be a tight spot, not real tight but enough to notice. do you think this could be a problem?
Thanks for your input,

James"
 
The mpellr is not on center in

The mpellr is not on center in the housing. It is Ecentric so when turning the pully it would or should be tight all the time.
The only way to tell is to remove the cover plate and look.

Take it slow and think things thru
 
What Kg said.
A minor tight s

What Kg said.
A minor tight spot is not likely to be an issue. Once the new impeller is installed you should not notice it at all. The pump will be quite stiff to turn all the way around.

Rod
 
"Mark;
You shud start your ow

"Mark;
You shud start your own topic to get better responses.
Yes, they are interchangeable.
In fact the only difference between any of the Bravos is the lower case I understand; the uppers are all identical except for ratios.

Rod"
 
Is there an easy way to change

Is there an easy way to change a v-belt on my 120 Mercruiser. It has to go inside the motor mount brackets. Anyone out there have any experience on this topic?
 
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