aluminum head corrosion coatings
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aluminum head corrosion coatings

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    Default aluminum head corrosion coatings

    I bought some brand new heads that where not hard anodised for marine use.The heads are fully assembled can i just take the valve out and have them hard anodized without effecting the guides and seats? or is there some kind of paint or coating can be poured just in the water jackets?This engine will never see salt water.I also drain all the water out of the engine after each weekend.

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    Senior Member Jake's Avatar
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    I had the heads off one of my engines the other day and was surprised at the deterioration of my alum. heads as a result of the water here in Havasu. Made me want to put cast iron heads on it and not waste nice alum. heads. It would be nice to find some way to protect alum. heads from this type of damage.

    I have often thought it would be beneficial to plumb fixed block drain lines to the outside of the transom with a open/closed valve to make draining the blocks easy every time I pull the boat out of the water but with the size of the block drain holes I assume they would plug up quickly defeating the purpose.
    Last edited by Jake; 01-16-2010 at 07:10 AM.

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    Quote Originally Posted by fuelcustoms View Post
    I bought some brand new heads that where not hard anodised for marine use.The heads are fully assembled can i just take the valve out and have them hard anodized without effecting the guides and seats? or is there some kind of paint or coating can be poured just in the water jackets?This engine will never see salt water.I also drain all the water out of the engine after each weekend.
    I do a lot of aerospace work that requires parts to be hard anodized and chem film, I know that they can mask stuff off if you don't want it to be anodized. I would think you would not want the chambers anodized.

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    Try calling these people on monday and ask. Plateronics Processing 818-341-2194.

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    deckboat owner rschap1's Avatar
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    There is a block off that can be applied to keep the hard coat masked. ALOT of areas will need that. It is like a paste and takes a while to get back off/out. All tapped/reamed holes need to be blocked. The additional material that the coating applies will keep the bolts from fitting. It could be done, but I think it would take ALOT of effort to do this after wards. Guides, seats, etc...Maybe if the coater was experienced they might have a more sophisticated method than I have seen. I am basing what I am telling you on what I did when building gages and fixtures that needed the hard coat applied. Our local heat treat company did the anodizing for us too. GOOD LUCK if you do it. I will be interested to see if anyone does have a better way.

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    Senior Member Hass828's Avatar
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    Would it help to put an anode in the end of each head like the outbord engines use?
    "if we keep doing it the same way we always do..we will always get the same results"
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    Quote Originally Posted by Hass828 View Post
    Would it help to put an anode in the end of each head like the outbord engines use?
    yes

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    I put one in a block drain hole. Hadn't thought of the head its self. I guess you need to drill and tap a hole in each head?

    Tim

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    Senior Member Hass828's Avatar
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    Quote Originally Posted by River Rat 005 View Post
    I put one in a block drain hole. Hadn't thought of the head its self. I guess you need to drill and tap a hole in each head?

    Tim
    Just my thoughts were put one on the end of each head right above were the water usually eats at the head surface would be a prime spot
    Last edited by Hass828; 01-17-2010 at 03:42 PM.
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    Thats what I'm thinking. My other thought was a closed system.

    Tim

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    In the jet boat section there is a guy that goes by Tiki talk to him about this he runs Embee coatings & I was talking to him about this at the finals.If I remember right he said they can coat the inside water jackets to protect against corrosion.

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    Thanks for all the ideas guys .I was wonder if i filled the all the water jacket holes up except for one and fill with glyptal paint(the paint they use in lifter valleys)and then drain the head .what do you guys think a recipe for disaster.I know the glyptal is water proof.

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    Senior Member Hass828's Avatar
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    check these out, cheap too
    http://www.boatzincs.com/engine-sizes.html
    "if we keep doing it the same way we always do..we will always get the same results"
    H8-2-W8
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    Senior Member alkyexpress's Avatar
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    If you put a coating in the waterjacket will that hinder the heat transfer ??

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