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Old 10-06-2010, 06:09   #1
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Engine Rust Questions

As you can see in the photo, I have a rust patch on the forward-most underside of my engine. The marine surveyor I used last year said to treat it with Boeshield T-9.

Two questions:

1. Should I pre-treat the surface using a wire brush and sandpaper, or is there a better/preferable method?

2. Is there something better to treat it with than what the surveyor recommended?

(Please don't tell me it's time to remove the engine and use it as an auxiliary anchor.)

Thanks as always,
- D
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Old 10-06-2010, 06:41   #2
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Forget what the surveyor said. The boeshield will just get it greasy and look terrible. Use a wire brush to remove all the rust you can, then brush on Oshpo or other phosphoric acid based rust converter. Then buy a rattle can of the engine paint, mask what's not engine, and spray the spot. It will look near new for a while, but try to keep the salt water off the engine, and rinse it off when you can't..
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Old 10-06-2010, 06:46   #3
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Oshpo, eh? Thanks, Don. Lemme go look that up.

Found it: Ospho... I'll check out the local hardware store for it.
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Old 10-06-2010, 06:55   #4
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Definately wire brush. Phosporic acid (Ospho) to help neutralize the rust then POR 15 is an excellent way of dealing with rust and assuring it will not come back or succumb to the principle causes of the rust in the first place. I used this on several auto restoration projects and it stood the test of time (Well, 20 or so years in anycase). The POR 15 is GREAT stuff!
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Old 10-06-2010, 07:00   #5
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Thanks, Strygaldwir (wish I could pronounce that... is it Welsh?) :-)

I looked up POR 15, and it DOES look like great stuff.
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Old 10-06-2010, 07:01   #6
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POR 15 works great. The POR actually means Paint Over Rust.
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Old 10-06-2010, 07:06   #7
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I too highly recommend POR. If you plan to paint over it, I suggest you let it dry until still tacky but not wet, then paint over it before it completely dries. Once dry, it is more difficult to prep and get the paint to stick. Also, do not apply heavily over bolts, since the coating is thick and a wrench will not fit the bolt without chipping off the POR.
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Old 10-06-2010, 07:12   #8
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Hmmm.... thanks! I see that Defender doesn't carry POR. Is it available at a hardware store or only in marine stores?
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Old 10-06-2010, 07:14   #9
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We bought ours directly from POR.
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Old 10-06-2010, 07:14   #10
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k thx I just placed an order for a pint of the silver.
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Old 10-06-2010, 07:15   #11
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Okay, Keith might be easier than Stri-gal-dwire. Have to start signing my post again!

Not Welsh, I don't think. Roger Zelazny, my favorite author!

Keith
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Old 10-06-2010, 07:26   #12
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From the pic it looks like a yanmar 2or 3gm motor. The amount of rust is nothing! Mine was worse. Wire brush + rust converter will work fine. Paint with a high quality 2k paint. In future I suggest keep engine parts covered with spray oil (once a week) but keep it off your belts.
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Old 10-06-2010, 08:29   #13
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you might want to hit the pulley at the same time while you're in there. LoL
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Old 10-06-2010, 08:49   #14
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Will do, cdennyb! The plan is to hunt down all rust spots and zap them.
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Old 10-06-2010, 11:00   #15
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All this stuff works great (you can get naval jelly at Home Depot) active ingredient phosphorous. Just keep it away from FG or epoxy.
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