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OX66 corrosion on head gasket

Old 11-03-2018, 07:41 PM
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Default OX66 corrosion on head gasket

Hello all,
Am new to larger outboards, have just purchased a boat with original 2002 200 hp OX66 saltwater series with according to hour meter 600 hrs. It does appear to be a 2 owner boat and the motor looks really good compared to some others of similar age during our search. It was purchased here on the gulf coast and has been a saltwater trailered boat itís entire life
The concern......a neighbor who states he has had other outboards expressed extreme concern at the corrosion at the head and power head gaskets. Stated he had blown motors and was convinced that the corrosion was the smoking gun clue that destruction was imminent.
Performed a compression test and had 120ís across all cylinders and no other performance concerns.
I am a new member of this site and did search similar threads but would really appreciate options of my particular situation
I could pull the heads or are there other things that I should look at before going to that step?

Thanks to all in advance for your insight
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TallCoTTon is offline  
Old 11-03-2018, 07:49 PM
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Originally Posted by TallCoTTon View Post
Hello all,
Am new to larger outboards, have just purchased a boat with original 2002 200 hp OX66 saltwater series with according to hour meter 600 hrs. It does appear to be a 2 owner boat and the motor looks really good compared to some others of similar age during our search. It was purchased here on the gulf coast and has been a saltwater trailered boat itís entire life
The concern......a neighbor who states he has had other outboards expressed extreme concern at the corrosion at the head and power head gaskets. Stated he had blown motors and was convinced that the corrosion was the smoking gun clue that destruction was imminent.
Performed a compression test and had 120ís across all cylinders and no other performance concerns.
I am a new member of this site and did search similar threads but would really appreciate options of my particular situation
I could pull the heads or are there other things that I should look at before going to that step?

Thanks to all in advance for your insight
compression checks are too quick to detect a slight leak. Your salt on the outer edge of gasket is a sign that gasket is leaking water thru. it would also leak thru to the cylinder. The leakage is also going to keep salt in contact with the machined surfaces of the block and head. Those surfaces do NOT have any corrosion resistant coating to protect them. I would consider replacing the gasket and inspecting the sealing surfaces. You cant get rid of the salt by flushing it either. The gasket is likely eaten away from salt. Do it as someday, the water will leak into the cylinders and lead to cylinder corrosion when not running and more problems. GL
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Old 11-03-2018, 08:41 PM
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I wouldn't be terribly concerned but I would address it given its age. The head and cover bolts would have likely been painted originally which tells me that the heads have been pulled, probably to change the internal anodes. Do that again now if you intend to keep the motor. Pretty easy and it will give you a chance to check it out and get some anit-seize on a new set of bolts before it is too late to do that. Gaskets, t-stats, poppet, clean the VST filter and O2 sensor while you're at it. Mount a f/w separator if it doesn't have one and you might be good to go for a lot of hours with that thing. It's a workhorse.
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Old 11-04-2018, 04:03 AM
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I'd be interested to find out what a gasket change out would cost. If it's a reasonable price, this may be one of those "stitch in time save nine" situations.
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Old 11-04-2018, 04:28 AM
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Originally Posted by deltarome View Post
compression checks are too quick to detect a slight leak. Your salt on the outer edge of gasket is a sign that gasket is leaking water thru. it would also leak thru to the cylinder. The leakage is also going to keep salt in contact with the machined surfaces of the block and head. Those surfaces do NOT have any corrosion resistant coating to protect them. I would consider replacing the gasket and inspecting the sealing surfaces. You cant get rid of the salt by flushing it either. The gasket is likely eaten away from salt. Do it as someday, the water will leak into the cylinders and lead to cylinder corrosion when not running and more problems. GL
I kinda disagree. This is something that is normal on these ox66 in saltwater conditions. They well corrode along the gasket surface just like the cooling passage cover. Looks like that was cleaned or replaced. Clean it with a wire bush and vinegar. Then dry it and spray some Yama shield.

Also its a simple thing to replace the head gaskets and the anodes are below the head. Replace them also. But clean the corrosion off and spray with Yama shield.
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Old 11-04-2018, 06:06 AM
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I had the same look on my 2001 225 and change the water gasket and head gasket, as the water gasket had a pin hole on one side and the mechanic recommend that I do the head gasket also as its the same bolts holding the head gasket on. Found that the head gasket was ready to let go and got the new head gasket installed just in time. I have owned the motor since 2003 so I knew nothing was changed it was time anyway to change.
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