Protective coatings for engine components?

[newbster]

Say you had an engine whose cooling components were in excellent condition and you did not want that to change. If I was going to take it all apart for a rebuild anyway is there something I could treat the components with to prevent corrosion in the salt? Its all flushed every time but is there something to dip them in or spray coat on? I'm trying to not replace stuff for something as pointless as corrosion.

 

[mkast]

Re: Protective coatings for engine components?

Usually on tear down, parts are cleaned for inspection.
If you plan on bagging the parts after inspection, no problem.

 

[newbster]

Re: Protective coatings for engine components?

Maybe I'm misreading your reply but I'm wondering if there are protective paints/coatings that can be applied so that corrosion potential is reduced once the engine is back running again.

 

[mkast]

Re: Protective coatings for engine components?

When the engine is back running, won't the engine oil do that?

 

[Fishermark]

Re: Protective coatings for engine components?

If you are talking about the internal cooling passages, then I don't believe any coating is available. "Salt Away" is a product many use and say is very good - it is used as a flushing agent.

If you are talking about the externals, then I do suggest spraying some corrosion guard on the engine itself as a way to reduce corrosion. I sprayed down the entire engine on my boat with a good corrosion guard spray and it has helped keep it free from rust. If you boat in salt water (and by your question I assume you do) then you obviously know that eventually most anything will rust. It is important to keep on top of that situation with prevention / painting etc before it becomes a big problem.

Not a whole lot you can do about the insides of the manifolds, etc other than flush and replace periodically.

 

[superpop]

Re: Protective coatings for engine components?

I think he is talking about cooling passages and external parts. I do not know of anything that would slow down the corrosion process.

 

[newbster]

Re: Protective coatings for engine components?

Yes, I'm hoping to take steps pro actively that would reduce maintenance and repairs going forward. I never understood why such parts are considered expendable. If there was something I could coat the internal passages with that would slow down that process, I'd be using it religiously. Replacing manifolds every few years vs something that will last forever is an easy decision. Right now my components are corrosion free but I'm now running the boat in the salt and want to minimize pain going forward.

Does flushing with salt away really matter? If I give it all a scrub down and run each motor on the hose or fresh water for 10 mins I would imagine what little salt is there would simply dissolve immediately.

 

[Fishermark]

Re: Protective coatings for engine components?

If I give it all a scrub down and run each motor on the hose or fresh water for 10 mins I would imagine what little salt is there would simply dissolve immediately.

I'm guessing you are new to salt water?

If you are in salt water things will corrode. Period. They last longer with flushing, but they WILL corrode. I wash down my aluminum trailer with galvanized axles, etc every time and it doesn't matter. Even the galvanized steel rusts. It is a fact of life with salt water.

 

[Fishermark]

Re: Protective coatings for engine components?

One more note on the salt away. I personally do not use it as it is somewhat expensive. To me whatever extra life time is gained by using salt away is going to lost in dollars using the product. I simply flush the engine with the hose - muffs - every time I use the boat. But I do also stay on top of the external rust on the engine itself.

 

[Uraijit]

Re: Protective coatings for engine components?

Anybody ever try POR-15? http://www.por15.com/

Never used it on a boat, but it works GREAT on cars, etc. Kinda pricy, but worth every dime (for cars/trucks anyway).

I was thinking about pouring some inside my risers/manifolds, and seeing what difference (if any) it would make. I boat in fresh water, so it wouldn't be as drastic...

 

[newbster]

Re: Protective coatings for engine components?

Por-15 does work great on cars. If it would not flake off it might be pretty handy for a coating on manifolds. I just called them and they said "not for internal coatings". I would think something would help coating the risers/manifolds. For the sake of clarity, I'm talking about stopping internal and external rust on a marine engine. Nothing is absolute but if anyone has experience with something that helped then great, its probably worth the cost.

Here are a few other ideas:
http://www.sanchem.com/ox.html
http://www.skyvision.com/store/mi5500065.html
http://www.clearcoproducts.com/cold_...FRsRagod50WJPA

 

[Bondo]

Re: Protective coatings for engine components?

For the sake of clarity,

Ayuh,....

I'll try to be Very Clear,....

Nothing,.... Absolutely NOTHING will stop saltwater Corrosion in/ on Cast Iron....

Anything you put on the Internal surfaces will just peel off,+ Clog the system downstream......

 

[wca_tim]

Re: Protective coatings for engine components?

I have por15 on my polished aluminum exhaust manifolds and have put it on mag wheels and chrome. I'll probably do my windshidld frame this winter at some point as well...

that's the glisten clear product - very impressive stuff in my experience. as is the hardnose I've used on some things.

and on coating passages... Bond's got it. anything you can imagine coating with, eventually the edge will delaminate from the metal and it will trap ions, etc... under. an issue for coating internal water passages is also that IF you put a significant coating, once it DOES start to come off, it is goign to help clog things up. for aluminum hard annodizing helps overall, but isn't bulletproof either.

cast iron, salt water -> rust not an easy way around it... especially on internal passages where you can't easily maintain and reapply coatings...