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Old 07-12-2020, 01:10 PM   #1
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Rust removal

Thanks to all who gave me suggestions on how to get my pulleys off my engine. They’re off and I’ve been using electrolysis to remove the rust. The hard to get places are the groves and I was wondering if anyone has tips for getting the remaining rust out of the deep parts of the groves. These pulleys are no longer available and so I’m using the originals. They clean up great except for down in the groves. Ideas???
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Old 07-12-2020, 01:39 PM   #2
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Use some rust killer after wire brushing, then paint. Don't worry overly about rust deep in grooves where belts are not supposed to touch anyway.
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Old 07-12-2020, 01:49 PM   #3
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Machine shops often have glass bead blasting cabinets for small parts.
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Old 07-12-2020, 02:18 PM   #4
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The rust can be pacified with phosphoric acid (if you can find it) or a product like Ospho.
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Old 07-12-2020, 04:38 PM   #5
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This is not making any sense. If the pulleys are submerged in a liquid and voltage is being applied to them, why is not every thing that is submerged being cleaned? Why can't the liquid reach the groves?
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Old 07-12-2020, 05:38 PM   #6
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This is not making any sense. If the pulleys are submerged in a liquid and voltage is being applied to them, why is not every thing that is submerged being cleaned? Why can't the liquid reach the groves?
Not all the rust has come off. A lot has. The pulleys were in the electrolysis tank for 24 hours and the rust was leaving the pulleys and collecting on the anode. I wasn’t satisfied either as I thought all the rust should be gone. I’d gladly take any advice as to the duration of time in the tank. Maybe I need more time but I’m sure it’s set up correctly.
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Old 07-12-2020, 07:49 PM   #7
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Just need to do it some more.
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Old 07-12-2020, 08:04 PM   #8
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Maybe degrease - if there is any in the groove it won't be as effective.
Also proximity to the anode is a factor so you might try a different orientation,
I did this on a wood lathe I was refurbishing and it worked well. Different parts required different containers and anode arrangements.
More time should not be a problem as the reaction ceases once the rust is gone. It is essential to at least prime the pieces ASAP after removal from the solution, rinsing & drying (heat gun).
I had good luck with self etching primer followed by engine enamel.
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Old 07-12-2020, 08:40 PM   #9
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I had good results using vinegar to clean rust
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Old 07-12-2020, 08:51 PM   #10
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Good Off rust remover
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Old 07-13-2020, 12:19 AM   #11
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"groves"??
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Old 07-13-2020, 02:25 AM   #12
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Maybe use a thin wire brush to get in there, or as suggested above donít worry since the belt wonít ride that deep anyway.
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Old 07-13-2020, 06:16 AM   #13
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In the US, phosphoric acid is easily obtained. Home Depot has it in 35% concentration marketed as Kleen Strip concrete etching fluid. Find it in the "paint" section. Amazon has it in a 70% solution.
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The rust can be pacified with phosphoric acid (if you can find it) or a product like Ospho.
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Old 07-13-2020, 09:55 AM   #14
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Put your pulley in a vice and use a 3" grinder with a stiff wire wheel to clean the groove. 2 coats of ospho, two coats of rustoleum primer and two top coats and you will never have to touch it again. (Assuming you follow application instructions)
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