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Discussion Starter · #1 · (Edited)
I have notices around some of the nuts on the bottom of the powerhead have that white powdery corrosion on them, what is the best way to treat it and preventable maintenance:huh:

I added some pics to this post near the end
 

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I soak my motor every cpl weeks when it is in the slip and when she gets put awawy. I use WD or CRC as well. I just buy the gallon container and fill a spray bottle.

I would clean off the corrosion with some WD/CRC and a wire brush...then soak that sucker.
 

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Discussion Starter · #4 ·
is there a product to neutralize the corrosion first?
 

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The while chalky stuff is what's left over from the corrosion process. Be sure to check and change your zincs often. Also look for any lying water under the cowling.

Spraying WD40 displaces and moisture that is present, and without moisture, the corrosion process is greatly slowed down.
 

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Preventable maintenance would be to spray the powerhead down with CRC at the time of winterization. We spray all our motors down with CRC/ WD40 mix.
This stuff is like water. Its better than nothin but to me its useless specially wd40. CRC is the better of the two, but I use a quality product called Corrosion X. Use it once and tell me you don't see a difference.
Yup, expensive and worth it.
 

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Corrosion X-HD

Who sells Corrosion X and has anybody tried the Corrosion X-HD version which is thicker than the standard spray? Thanks
 

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I have notices around some of the nuts on the bottom of the powerhead have that white powdery corrosion on them, what is the best way to treat it and preventable maintenance:huh:
Are you talking bolt heads on the heads?? Explain better which bolts..

She could be "making salt" caused by running too hot. If the water jackets are getting clogged with salt this could be causing what you are seeing.. Are you seeing any salt around the edges of the head gaskets?

What engine and how old is she?

Personally I think Corroision X or Block is just over priced CRC 6-56. I've never seen much difference between them except they are three times the price as CRC.. You spray your engine powerhead down top to bottom once a month in the season with CRC and you'll never have corrosion problems.. And quit buying it in the spray can....buy it by the gallon and use a hand sprayer.
 

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Discussion Starter · #12 ·
Are you talking bolt heads on the heads?? Explain better which bolts..

She could be "making salt" caused by running too hot. If the water jackets are getting clogged with salt this could be causing what you are seeing.. Are you seeing any salt around the edges of the head gaskets?

What engine and how old is she?

Personally I think Corroision X or Block is just over priced CRC 6-56. I've never seen much difference between them except they are three times the price as CRC.. You spray your engine powerhead down top to bottom once a month in the season with CRC and you'll never have corrosion problems.. And quit buying it in the spray can....buy it by the gallon and use a hand sprayer.

These are the headbolts on a 2001 Merc Optimax, mainly the two bolts inside the cowling at the bottom, it looks like salt build up, I have the digital interface and it always says the motor temp is good and when I check the actual temp its about 120.

I have to look at the gasket between thepower head and body, I do not think there was anything, I will take a few snaps and get them up.
 

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These are the headbolts on a 2001 Merc Optimax, mainly the two bolts inside the cowling at the bottom, it looks like salt build up, I have the digital interface and it always says the motor temp is good and when I check the actual temp its about 120.

I have to look at the gasket between thepower head and body, I do not think there was anything, I will take a few snaps and get them up.
Go to any hobby shop and for 30 bucks you can buy a infared heat gun. These are cheap units they use to check little nitro gas engines when they are breaking them in.

You have to be close to what you are reading not like the bigger guns that will shoot from 6-8ft away. But I would check the temps up and down each head..

Temp sensors on outboards are at the tops of the heads not where you are seeing the salt build up..
 

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Tight Lipped,
I am having the same issues with my twin 02 200 hp optimax noticed it at the end of last year and noticed that the #6 plug has a corrosion as well as the nut/bolts on the block I have been spraying with 656 every other trip I kept thinking my cowllings were beginning to leak now that i read what dunk says I am wondering if its time to replace the t-stats I am following this thread so if you find anything out let me know thanks. Coach
 

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Discussion Starter · #17 ·
Here are some Pics from the bolts

the first two are of bolts on the inside of the cowling and the bottom of the power head with the water tube, and the last is the bolt that hold the PH to the body





 
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