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Oday 30 10-31-2012 04:07 PM

Repainting motor help
 
Anyone have any advice for blasting a motor clean for Repainting? I'm gonna blast it to make sure I get all the crannys. I'll obviously be extremely careful on the aluminum. Any advice is welcome.

MarkSF 10-31-2012 05:10 PM

Re: Repainting motor help
 
I'd be very cautious about blasting it yourself. If it has zinc chromate primer, you could do yourself and your neighbours some serious harm.

I'd just scrape off any loose paint, sand it lightly to key in the new paint, and paint it.

SloopJonB 11-01-2012 09:31 PM

Re: Repainting motor help
 
By "blasting" I take it you mean sand or some other media blasting? If so, don't. Pressure wash it instead or steam clean it if possible.

fryewe 11-01-2012 10:53 PM

Re: Repainting motor help
 
I sprayed mine with brake cleaner a couple of times...brushed away all the paint that bubbled or loosened up with small bronze wire brushes...painted all exposed rust on steel parts with the stock solution sold in auto parts stores for converting red rust to black/grey oxide...sprayed with brake cleaner again...brushed with bronze brushes again...used a 100# air nozzle to blow away all loose stuff in the crannies and wiped the engine down with microfiber cloths. Then I sprayed a couple of coats of Yanmar/Mack grey paint on her from spray cans. Engine looks pretty good.

alanr77 11-02-2012 09:33 PM

Re: Repainting motor help
 
Good Evening O-30, I just finished repainting my old Atomic 4 with POR-15's engine paint kit. It turned out remarkable. Prior to using the two different cleaners included with the kit, I scraped loose paint off with a wire brush. Then soaked the engine in simple green while scrubbing with a stiff brush. I repeated this until water did not bead on the metal. This meant grease and oil were not present. The chemical used by POR is called "Marine Clean". It is apparently water based. The second is used for the proper adhesion of the POR15. Not sure what it is. Just remember; heavy solvents, though great for breaking up the grease and oil, will sometimes leave a residue of their own. I have found that most metals take paint better after an "etching" type primer is used. Hope this helped.

Brewgyver 11-03-2012 05:24 PM

Re: Repainting motor help
 
Quote:

Originally Posted by Oday 30 (Post 941061)
(snipt)I'll obviously be extremely careful on the aluminum. Any advice is welcome.

Aluminum? Don't think I've seen any AL parts on my A4. Am I just not looking hard enough?

SloopJonB 11-03-2012 05:48 PM

Re: Repainting motor help
 
Quote:

Originally Posted by Brewgyver (Post 942438)
Aluminum? Don't think I've seen any AL parts on my A4. Am I just not looking hard enough?

Carburetor? Alternator? Thermostat housing?

alanr77 11-04-2012 10:35 AM

Re: Repainting motor help
 
"carburetor, alternator, housing" yes, but it was assumed that anyone stripping their engine to paint would remove these things. Reminds me of an old car I inspected a while ago. Ad said "fresh engine paint." The wires were painted, air cleaner.....guy took a can of spray paint and "painted the engine."....back to the post; aluminum likes etching primer as well.

Brewgyver 11-07-2012 02:20 PM

Re: Repainting motor help
 
Quote:

Originally Posted by alanr77 (Post 942679)
"carburetor, alternator, housing" yes, but it was assumed that anyone stripping their engine to paint would remove these things.

Yes, I would remove carb (easy) and alternator. Paint on a V belt is never a good thing, and same goes with alternator windings. Hadn't thought of the t-stat housing, but from memory mine is iron (?), have to check that.

I've got a more basic question: Do you have the motor out of the boat? Things get a LOT more manageable then. Inside the boat, IN the water, limits your options. You can't douche it with engine cleaner and hose it off, with the resulting mess being pumped out into the water. You would want to leave the pump off and shop vac the mess out of the bilge.

I like Alanr77's simple green approach.


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