Rust on crankshaft journals - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 05-14-2015, 02:31 PM Thread Starter
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Rust on crankshaft journals

Hi, the crankshaft of my W115 has some surface rust that has developed on the journals. I saw a video on youtube of a guy that polishes the journals of a crankshaft that has way more rust than mine and with good results. Is it doable?? Or do I have to grind the journals?
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post #2 of 7 (permalink) Old 05-14-2015, 08:11 PM
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i would regrind it to the next size , but before you do that see what is available for bearings .
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post #3 of 7 (permalink) Old 05-15-2015, 08:23 AM Thread Starter
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I don't think there are many options avaliable on undersized bearings for that car since it's quite old. But I'll see what I can find. If not then I'll just polish them as good as they can be polished.
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post #4 of 7 (permalink) Old 05-15-2015, 09:59 AM
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Polish with emory cloth tape, and then see if there's any pitting on the journals
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post #5 of 7 (permalink) Old 05-15-2015, 10:06 AM Thread Starter
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Originally Posted by Zeitgeist View Post
Polish with emory cloth tape, and then see if there's any pitting on the journals
What grade should I use??
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post #6 of 7 (permalink) Old 05-15-2015, 11:52 AM
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I read somewhere that you typically start at 400 and work up to 1000. Depending on how rusty the journals are, you could start with 320, but probably nothing below 220
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post #7 of 7 (permalink) Old 05-15-2015, 01:54 PM
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You might consider taking it to a crank shop to have it polished-then they can mic it and check the hardness. I had the 560 crank for my project totally blueprinted for $125-check for straightness, mic and magnaflux, micro polished and check the hardness on all the journals.
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