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07-30-2015, 03:10 PM | #1 |
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molassess and crank shafts
Last week I got rid of 2700# of scrap. I did keep some merc cranks that I would like to save. Pretty rusty although the bearings surfaces are not to bad. Question is if I soak these cranks in molasses and water for 3 or 4 days to remove the rust, will this harm the bearing surfaces. All the cranks need to be reground. Thanks Bill
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07-30-2015, 04:28 PM | #2 |
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Re: molassess and crank shafts
I would NOT put them in molasses,this will attack the steel,any high grade steel will be badly affected by the molasses,this will take the carbon out of the steel.
Lawrie |
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07-30-2015, 04:37 PM | #3 |
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Re: molassess and crank shafts
I would agree with Lawrie. Some friends took an Arnold Bristol block and put it in a Molasses mixture and probably ruined the block. The metal is now very flaky. Dave/Green Bay
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07-30-2015, 05:45 PM | #4 |
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Re: molassess and crank shafts
I have done a half dozen blocks and they came out great.
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07-30-2015, 06:02 PM | #5 |
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Re: molassess and crank shafts
You have to monitor it....couple days in molasses or vinegar can attack the surface rust without destorying the remaining good metal. Couple weeks and you might be in for trouble.
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07-30-2015, 07:04 PM | #6 |
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Re: molassess and crank shafts
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07-30-2015, 07:09 PM | #7 |
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Re: molassess and crank shafts
In this case baking is out of the question. Nearest oven I know of is 800 miles away.
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07-30-2015, 07:42 PM | #8 |
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Re: molassess and crank shafts
Bill Glass bead ? is that an option ?
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07-30-2015, 07:44 PM | #9 |
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Re: molassess and crank shafts
maybe if I can lift it into the beader. Never thought of that. Mask off the bearing surfaces. Hmmmm
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07-30-2015, 07:57 PM | #10 |
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Re: molassess and crank shafts
You didn't say you had a blaster....duct tape the journals and glass bead the rest of it. Then have the journals ground or polished.
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07-30-2015, 08:18 PM | #11 |
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Re: molassess and crank shafts
If you have the scratch, you should try EvapoRust. That stuff is fabulous; eats up rust and doesn't touch anything else. I did the Grille extensions/Parking light units on my '51, and while it removed all of the rust from ther backsides, it didn't touch the black paint in the grooves. About $90 for 5 gallons, though.
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07-30-2015, 09:57 PM | #12 |
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Re: molassess and crank shafts
LOL I have the scratch but not the itch.
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07-31-2015, 08:13 AM | #13 |
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Re: molassess and crank shafts
Just glass bead em, you won't hurt a thing, don't forget to remove the sludge plugs in the cranks. I run a steel brush with a drill in those sludge holes. Walt
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07-31-2015, 08:56 AM | #14 |
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Re: molassess and crank shafts
Soda blast them
R |
07-31-2015, 10:18 AM | #15 | |
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Re: molassess and crank shafts
Quote:
800 miles is like driving to Minneapolis or Denver. There will most definitely be one between you and there.
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07-31-2015, 10:34 AM | #16 |
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Re: molassess and crank shafts
The only oven I have found is in Creston British Colombia. Just over 1000 km each way. I have used it when passing through and it was great.
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07-31-2015, 11:28 AM | #17 |
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Re: molassess and crank shafts
I would think hard about using glass bead. If those beads can find a way into the engine, all hell will break loose.
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07-31-2015, 12:55 PM | #18 |
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Re: molassess and crank shafts
Man oh man, I am with you on this one. I would not take the chance.
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07-31-2015, 01:07 PM | #19 |
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Re: molassess and crank shafts
Whats the difference with the beads over the leftovers from the grinding wheel when you grind it later...
Have to be cleaned up before assembly anyhow. For small narrow passages like a carb i prefer sodablasting that disolves when washing it. |
07-31-2015, 02:34 PM | #20 |
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Re: molassess and crank shafts
well I cleaned 3 of them with glass beads. Will give them a thorough cleaning tomorrow before the hot tank.
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