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burned 2 cylinders on the outboard today, I give up!!!

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Old 12-10-2007, 07:27 PM
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Originally Posted by Audiofn View Post
Did you punch a hole in the cylinder or just have alluminum come off the piston? I have had a LOT of luck getting the allum. off the cylinder walls when I melted down a few pistons. Acid and scotchbright pad. It takes time but does work well.
No holes, but the walls are scored.
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Old 12-10-2007, 07:28 PM
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Originally Posted by allstarmarine View Post
in reply to the 2 bottom burned cyl. i would almost bet you got water back up thru the exhaust.could happen by coming off plane hard ,motor mounting to low ,excess water in bilge ,large wave hitting back of motor ,excess wieght on back of boat .seen it alot in my area ,people gather on back of boat at island to party ,drink and swim and flood to bottom cyl. also had a boat go into water no bottom plug and when he realized it started it up to put it back on trailer and burned two bottom cyls.this is also common on bracketed boats because the motor is so far off the back of boat it goes deeper than normal
I guess thats possible, but never heard of reversion on an outboard??
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Old 12-10-2007, 07:29 PM
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Originally Posted by racer-x6 View Post
Check the string gasket between the cyl. and the exhaust plate. Does the exhaust plate look clean where the exhaust comes out of the cyl. ? if the leak is on the exhaust side it will suck water in on the down stroke. It is unlikely the both head gaskets failed at the same time.
Not sure where this string gasket is, but I will take a look at the exhaust tomorrow.
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Old 12-10-2007, 08:08 PM
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i thought half the fun was broken and bloody knuckles?
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Old 12-11-2007, 08:52 AM
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Not sure where this string gasket is, but I will take a look at the exhaust tomorrow.
its behind the exhaust plate, look at the exhaust plate close for any holes.
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Old 12-11-2007, 09:25 AM
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its behind the exhaust plate, look at the exhaust plate close for any holes.
do ya mean the adapter plate under the powerhead??
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Old 12-11-2007, 09:26 AM
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i thought half the fun was broken and bloody knuckles?
it is

I havent given up, was just a little upset at the moment it happened, i'll get over it, just trying to figure out how to wrap up my wifes new powerhead she is getting for christmas
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Old 12-11-2007, 09:28 AM
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do ya mean the adapter plate under the powerhead??
No, the plate behind the coils. water flows on one side and exhaust on the other. I have seen salt water eat through the inner plate and leaks into the cyl.
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Old 12-11-2007, 09:37 AM
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Old 12-11-2007, 06:20 PM
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Rick, sorry to hear this, but don't give up.......
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