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Old 02-20-2018, 09:44 PM   #1
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Aftercooler Maintenance

Pulled my coolers this weekend and sent the cartridges out

Kept the housings to clean myself.

To remove the black very hard gunk that is left behind on the mating surfaces of the housing and end cap...is it ok to take an orbital sander w 220 grit to it to clean it up? w light pressure

Housing is Aluminum and caps are brass I think.

Ive tried every type of solvent and doesnt get it off.

Motors are yanmar 6LYA 370's

Thank you
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Old 02-20-2018, 10:28 PM   #2
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Try barnacle buster. Look up on google...works great
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Old 02-20-2018, 10:32 PM   #3
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I'd be a bit nervous, just because of the risk you don't get it even. I'd be more inclined to use a rotating wire brush in a drill. Have you tried actual gasket remover that is sold at the auto parts store? Its spray on, wait, scrape off and repeat. I've had decent luck with it. A couple times when I've felt the need to use sandpaper, I've glued it to a flat piece of granite tile and put it on the work bench. Then moved the part around on it.

good luck

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Old 02-21-2018, 08:44 AM   #4
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Try barnacle buster. Look up on google...works great
I've used that for the raw water side ...i.e... the cooler cartridge and other exchangers but I am referring to the black gunk on the housing and end caps

Barnacle buster for that too?

I was thinking some type of solvent as perhaps some of it is coming from the exhaust ?
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Old 02-21-2018, 08:46 AM   #5
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And my main question is, is ok to use 220 grit on an orbital w light pressure to clean up the matin surfaces of housing and end caps ?
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Old 02-21-2018, 09:27 AM   #6
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Ultra sonic cleaning is the way to go for marine coolers. I know some people that send their after coolers from Juneau to Seattle in the off season. Sending ACs out works that good if a commercial ultra sonic shop is not nearby. Industrial non marine users have been doing it this way for decades with great success. on water treatment and boiler pieces.

As always, use the acids with great care, not only for your self but the hard metal unit you are dunking in acid. Not all core welding rod is acid proof, no fun to find out the hard way.
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Old 02-21-2018, 09:32 AM   #7
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Great
Thanks guys
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Old 02-21-2018, 09:40 AM   #8
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Dont use any acid on aluminum. I dont know whats in barnacle buster but it is probably acidic
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Old 02-21-2018, 09:46 AM   #9
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keeping the ends flat is important so a sander could be a problem. Razor blades work sometimes on old gasket sealer.
I would try a file kept flat across both edges of the opening. If the black stuff is some sealant then more of the same once it is flat and clean would probably work without perfectly cleaning the metal.
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Old 02-21-2018, 09:47 AM   #10
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Dont use any acid on aluminum. I dont know whats in barnacle buster but it is probably acidic
it is
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Old 02-21-2018, 09:49 AM   #11
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keeping the ends flat is important so a sander could be a problem. Razor blades work sometimes on old gasket sealer.
I would try a file kept flat across both edges of the opening. If the black stuff is some sealant then more of the same once it is flat and clean would probably work without perfectly cleaning the metal.
this is why im thinking 22o light pressure
I tested it out and it does seem to take down the dark guy without hitting the metal too much.

going to call a radiator shop that specializes in this
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Old 02-21-2018, 10:16 AM   #12
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Just spoke to radiator shop who specializes in this. Said cannot dip aluminum in acid or caustic solution.

They remove the gunk by scrapping flat.

Said 220 sanding is ok as long as i am not deforming the metal.

O rings make up for minuscule variation if there even is any.
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Old 02-21-2018, 10:25 AM   #13
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Are there gaskets or O-rings on the mating surfaces. If O-rings, it would be OK to clean up with sanding. Probably ok with gaskets too. Die-grinder with polishing discs is what I usually use to clean up funky surfaces.
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Old 02-21-2018, 11:23 AM   #14
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Are there gaskets or O-rings on the mating surfaces. If O-rings, it would be OK to clean up with sanding. Probably ok with gaskets too. Die-grinder with polishing discs is what I usually use to clean up funky surfaces.
O rings
Good call on the die grinder

Any excuse to buy a new tool... I'm in !
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Old 02-21-2018, 03:46 PM   #15
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Get a good one, Ingersoll 5102max is great. This is air powered. They have electric ones, never used an electric so no comment on them. And the pneumatic ones use a lot of air. Must have tool, in my opinion. Had to replace upper bearing on a rudder shaft last year, no room to beat it off, so hauled compressor to boat and die grinder and cut off wheel took care of job rather quickly.
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Old 02-24-2018, 10:21 PM   #16
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Moonzy1,

I have the same engines. Can you post some pics?

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Old 02-25-2018, 08:35 AM   #17
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Moonzy1,

I have the same engines. Can you post some pics?

JimL
I can Jim
I took tons of pics along the way. This was really not a difficult job.

I can send to your email as well and you are free to call me with any questions.

I jut reassembled them yesterday.

You want the whole process or specifics pics?

C
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Old 02-25-2018, 09:53 AM   #18
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Here is an annotated pic of what needs to be loosened to get it off.
This is a pic w the cooler already out. Its easier to see many of the points w it removed.

Click image for larger version

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Old 02-25-2018, 09:55 AM   #19
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Did you pressure test them? I used rubber pipe caps and a schrader valve to pressurize my coolers then put it in a water tank
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Old 02-25-2018, 09:58 AM   #20
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Bayview
I have not yet but plan to do that today if i can get some time.
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