Greg may be trying to get it clean enough to use the "Hard Block" in it. Will molasses get it that clean? Or will it leave a residue behind that Hard block won't adhere to?
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| Acid cleaning water jackets https://www.slantsix.org/forum/viewtopic.php?t=61750 |
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| Author: | Greg Ondayko [ Wed Dec 20, 2017 3:00 pm ] |
| Post subject: | Acid cleaning water jackets |
A few questions about the acid cleaning process of the water jackets in the block.. How much acid is needed? One gal? Is it mixed / cut with water? What do you use to plug the small / medium water ports on the top of the deck? Thanks, Greg |
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| Author: | Doctor Dodge [ Wed Dec 20, 2017 4:48 pm ] |
| Post subject: | Re: Acid cleaning water jackets |
If just doing the block, I use a plastic plate over the water pump opening and then level the block, with the deck surface up. Steel freeze plugs need to be removed and replaced with rubber. You will have to resurface the deck once the etching is finished. Remember, add acid to water, never water to acid so save some acid and dilute into water and then carefully use that to top-off your "standing block", as it bubbles away... for days. Rubber gloves, safety glasses, old cloths and a well ventilated area are all "in order" when doing this. Breathing the fumes and getting rid of the used acid are the hassles with this process. DD |
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| Author: | Greg Ondayko [ Wed Dec 20, 2017 4:55 pm ] |
| Post subject: | Re: Acid cleaning water jackets |
I bought a gallon of muriatic acid and plenty of rubber stoppers and rubber freeze plugs. Thanks for your help doc. Will a clean up pass of .001-.002 work for the top of the block after this process? Greg |
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| Author: | SlantSixDan [ Wed Dec 20, 2017 6:44 pm ] |
| Post subject: | Re: Acid cleaning water jackets |
Keep in mind acid is not the only stuff that will take away large amounts of rust. There is Evapo-Rust, and there is also molasses (pics and info at the link). Both of those are a whole lot safer and easier to handle than acid, and molasses has the added advantages of being very inexpensive and very easy to dispose of without making a toxic waste dump of your local vicinity. |
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| Author: | DadTruck [ Thu Dec 21, 2017 5:30 am ] |
| Post subject: | Re: Acid cleaning water jackets |
a gallon of molasses at Tractor Supply for $10.00 https://www.tractorsupply.com/tsc/produ ... eAQAvD_BwE I have a rusty oil pan that needs some attention, I'll give the molasses a try. |
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| Author: | Badvert65 [ Thu Dec 21, 2017 5:49 am ] |
| Post subject: | Re: Acid cleaning water jackets |
Is molasses something you could use in the water jacket (block or head)? |
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| Author: | Dart270 [ Thu Dec 21, 2017 6:41 am ] |
| Post subject: | Re: Acid cleaning water jackets |
Diluted molasses. See Dan's link above to molasses. I wonder if doing molasses or Evaporust, then a weak acid wash after that might be the best? I assume the block will be hot tanked at a machine shop first to get grease off? Otherwise, any oil/grease will block acid or whatever from reaching rust beneath it. Lou |
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| Author: | Rick Covalt [ Thu Dec 21, 2017 9:43 am ] |
| Post subject: | Re: Acid cleaning water jackets |
Greg may be trying to get it clean enough to use the "Hard Block" in it. Will molasses get it that clean? Or will it leave a residue behind that Hard block won't adhere to?
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| Author: | SlantSixDan [ Thu Dec 21, 2017 10:51 am ] |
| Post subject: | Re: Acid cleaning water jackets |
Quote: Is molasses something you could use in the water jacket (block or head)?
…read the text and view the pictures at the link I posted.
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| Author: | Greg Ondayko [ Thu Dec 21, 2017 12:13 pm ] |
| Post subject: | Re: Acid cleaning water jackets |
Yes I am preparing it for Hardblock. I was unaware of molases or anything else for this kind of process. It's at the Machine shop checking for cracks and Hot tanking and Getting Lifter stand offs installed. Then back to me for acid cleaning, HardBlok Fill, Glyptal Coat the insides and then back to Machine Shop with Caps and Honing Plate for Boring, and Line honing, and Main Cap Fitment. Greg |
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| Author: | Louise76 [ Tue Dec 26, 2017 8:47 pm ] |
| Post subject: | Re: Acid cleaning water jackets |
Apparently I'm igorunt: I thought the whole end purpose of "hot tanking" a bare engine block was to clean out the coolant passages, so that further acid cleaning & flushing isn't necessary. I need enlightenment... 
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| Author: | Greg Ondayko [ Wed Dec 27, 2017 6:48 am ] |
| Post subject: | Re: Acid cleaning water jackets |
I have had blocks hot tanked that still had lots of junk in the water jackets.. Hot tank process is great for the outside and crankcase cleaning. Greg |
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| Author: | Dart270 [ Wed Dec 27, 2017 10:06 am ] |
| Post subject: | Re: Acid cleaning water jackets |
I would think the water jacket junk would be rust or non-greasy stuff that is left. The hot tanking or oven baking should remove the grease/oil, which could block the acid/etching of the rust... Lou |
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| Author: | Louise76 [ Thu Dec 28, 2017 10:33 pm ] |
| Post subject: | Re: Acid cleaning water jackets |
Thx. 
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| Author: | Doctor Dodge [ Fri Dec 29, 2017 5:05 pm ] |
| Post subject: | Re: Acid cleaning water jackets |
We have cleaned a lot of parts over the years, using many different chemicals and processes... For being the nasty process it is, the pool acid treatment seems to work the best when it comes to getting the water jackets totally clean, with-out spending a lot of time or money. We do the "acid soak" right after engine break-down and then send the engine into the shop for their "cleaning" / machining. ( hot tank, baking, "dishwasher" or what-ever they like to use...) When we pick the parts up, the shop usually asks me: " How did you get the water jackets so clean?"   One other side note, the acid etching can help you find cracks. The acid gets into the cracks, then bleeds-out and leaves stains, if let the block dry completely, after the etching process. DD 
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