Cosmetics - cleaning and de-rusting a diesel engine - SailNet Community
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post #1 of 3 Old 08-26-2013 Thread Starter
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Cosmetics - cleaning and de-rusting a diesel engine

We have a 33 year old boat with "probably" a 33 year old Yanmar 2QM20. And it is pretty rusty.

I would like to make it look a bit nicer. She runs greats.



I know I'll get 2 opinions for every reply, but how would "clean" this beast up?

Thanks

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post #2 of 3 Old 08-26-2013
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Re: Cosmetics - cleaning and de-rusting a diesel engine

Engine Brite and a parts brush is simple, long and dirty. Steam/hi pressure washer is fast,wet and dirty. Afterwards,use a phosphoric product like rustmort ta kill and convert rust.
Paint it like ya want
HTH,
Paul
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post #3 of 3 Old 08-26-2013
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Re: Cosmetics - cleaning and de-rusting a diesel engine

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Originally Posted by deltaten View Post
Engine Brite and a parts brush is simple, long and dirty. Steam/hi pressure washer is fast,wet and dirty. Afterwards,use a phosphoric product like rustmort ta kill and convert rust.
Paint it like ya want
HTH,
Paul
Yes, this is exactly what I did and it turned out fabulously. I skipped the Engine Brite and went directly to the phosphoric product though but I don't recall the name of it right now. I just let it sit on the metal for a day and then scrubbed everything with a metal brush. I took off the ends of the heat exchanger and had them bead blasted. For the rusted bolts (the WORST part!) I used AeroKroil and let it sit for a while before trying to crank them off. (Other products did not work.) I kept the old hoses on until after the spray painting with "Yanmar Grey," then replaced the hoses with new ones. I put a new pressure cap and water pump on, too. The engine looks brand new. Perhaps it's mostly cosmetic, but it runs great, too.
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Last edited by gamayun; 08-26-2013 at 02:02 PM.
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