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Over heating
Today, while out on the bay, I was running around 4200 RPM's when the motor just started sounding not quite right. It started rapping and just as I turn to have a look, the heat alarm goes off and all I see is steam everywhere. Like coming out of the pisser and from under the engine cowl. I shut it down immediately. The total time between the rapping and alarm/shutdown was probably 20-30 seconds. I raised the motor to have a look at the water intake. As I did, I saw something float away so I believe I sucked up a plastic shopping bag and blocked the intakes. The impeller and T-stat are new last year when I replaced my lower unit. After letting the motor cool down a bit, I started the motor. Got a little residual steam then water started pissing with a very strong stream. The motor rapped a little at first, then quieted right down. I ran it slowly for a while, no more heat alarm, so I gradually pushed the throttle a little at a time up to 4500 RPM. No issues.
My question is, does anyone think I may have caused powerhead damage for the short time it was overheating? I'm thinking not, but I get these weird scenarios and worry some thoughts running around my head all the time even when things go okay. Am I being paranoid? Should I have it looked at? Am I over thinking it? It ran good the rest of the day, so I just don't know. I'd like to hear any thoughts or suggestions. 
__________________
Heavily medicated for your protection. 
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#3
07-31-2011, 10:38 PM
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Sure wouldn't hurt to have it checked out...an AOK would bring back some piece of mind...
__________________
'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha 
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#4
08-01-2011, 08:28 AM
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I'll start by pulling the plugs I guess. From there, I know guy that will have a look without charging me.
Thanks gents.
__________________
Heavily medicated for your protection.
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#5
08-01-2011, 11:56 AM
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Quote:
__________________
'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha
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#6
08-05-2011, 12:11 PM
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Checking the compression would be an easy enough thing to do and might lend some little peace of mind. I doubt it hurt anything.
__________________
 1994 Wellcraft V21
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#8
08-05-2011, 02:28 PM
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I agree with MJ, It is a Merc so you will be just fine..
 
__________________
 1996 -19' NV Flats 115 Mercury 4-stroke 1983 -20' Wellcraft Center Console 250 XS
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#9
08-05-2011, 07:15 PM
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cb, i did something similar with my 40hp scallop boat. ran into a grass patch and did not know it. i thought i had an over heat alarm, not so. it ran so hot it stalled the engine. got a tow in and brought it to the house. started and ran fine, so i checked the plugs and found water. popped the head and changed the gskt. all is good now.
i did add a hot alarm!!
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