Boat won't start when it's hot

muskokamarc

muskokamarc

Member
May 28, 2018
200
Muskoka
Boat Info
1985 Sea Ray 210 Monaco
Engines
230HP Alpha One
My 1985 Monaco (230hp Mercruiser Alpha One Sterndrive) started up no problem after 7 months of winter, but it will not start back up once turned off when the engine is hot (It requires me to sit for 30 min - 1hr before starting again). The boat does seem to be running hot as well based on the gauges and the exhaust being hot to touch. I am going to take the boat to the marina but wanted to suggest some areas to look at in order to save a few bucks...

Does anyone know what the issue could be? (Had the impeller and thermostat replaced last year)
 
So running hot before those 2 things ? That's an old motor, how old are the 2 pumps ? raw water and circulating . Hosing from out-drive to exhaust ? Blockage?
Water in, water out.
 
scoflaw said:
So running hot before those 2 things ? That's an old motor, how old are the 2 pumps ? raw water and circulating . Hosing from out-drive to exhaust ? Blockage?
Water in, water out.
Click to expand...

Yes it was running hot before them.

I'm not too sure about the pump age but the it's the original boat engine and only has 600 hours on it.
 
your carb`d so doubtful its vapor lock .How old are the manifolds and elbows?
Verify the temps with a laser and correct the overheat condition
Raw water temps should be no more than 165
 
All I can say is if you did not get all the pieces of impeller out back in your hand when changed. They are more then likely clogged in oil coolers if equipped with them on you boat if not they are somewhere in system restricting the water flow. Had a hell of time chasing
20170804_185805_001.jpg
20180507_165550_001.jpg
my over heat problem few years back on my 300 W/Ender. here are pictures of what I pulled out of coolers 1 side I had fail other motor never did impeller. Pulled apart to see and found same in port motor
 
duckhead69 said:
All I can say is if you did not get all the pieces of impeller out back in your hand when changed. They are more then likely clogged in oil coolers if equipped with them on you boat if not they are somewhere in system restricting the water flow. Had a hell of time chasingView attachment 84743 View attachment 84744 my over heat problem few years back on my 300 W/Ender. here are pictures of what I pulled out of coolers 1 side I had fail other motor never did impeller. Pulled apart to see and found same in port motor
Click to expand...
Wow, that's a lot of rubber. The marina did in fact provide me with the impeller back and it was intact although cracks were showing.
 
Bt Doctur said:
your carb`d so doubtful its vapor lock .How old are the manifolds and elbows?
Verify the temps with a laser and correct the overheat condition
Raw water temps should be no more than 165
Click to expand...
The manifolds and elbows are almost certainly original. I'm doubtful my grandfather ever did anything major to the boat.

But again, the boat only has 600 hours and has only ever been in freshwater.
 
muskokamarc said:
I'm not sure how I could determine if it's working correctly or not. Any suggestions?
Click to expand...

Take the thermostat out and put it in boiling hot water. You should see it operate if it is any good. The thermostat should have the temperature rating on it. Check to see if it is the correct temperature rating for your engine. Replace the thermostat correctlly with a good gasget.
 
electricaldoctor said:
Take the thermostat out and put it in boiling hot water. You should see it operate if it is any good. The thermostat should have the temperature rating on it. Check to see if it is the correct temperature rating for your engine. Replace the thermostat correctlly with a good gasget.
Click to expand...
Going to do this. Thanks.
 
I called my local marina and they suggested that it could be something called a 'hot soak'. They said it is possible that the carb is getting flooded with fuel and that's what could be causing it to not start back up after it's warm. Any thoughts?
 
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