As the rest of you I am always scouring Ebay for the next "upgrade" for my motas..
From time to time items which are not perfect are put up for sale (but I wouldn´t exactly call the scrap either)
Lets say I bought a pitted camshaft or a gearbox mainshaft with slight surface pitting.... can these be cleaned up (at home) if the pitting isn't to severe?
I am not building a race-car just doing a little "shedding" on my saloon... Input welcome!!
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Guest Message by DevFuse
0
How Much Corrosion Would Deem A Cam Or Mainshaft Unusable
Started By SpitmkIIICPH, Feb 19 2012 09:06 AM
4 replies to this topic
#2
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Loves monkeying with his car
Posted 19 February 2012 - 10:07 AM
Presume you refer to damage to the bearing surfaces, or the cam surfaces?
If you can feel the damage with your fingertip, then it is so deep that some metal must be removed to smooth the surface. There is no way that you can do this and maintain the correct profile without the aid of precision engineering machines, or the enormous skill of a master craftsman. In the old days, a scraper was a commonly used tool for final shaping of bearing surfaces! But clearances were greater then, and men had years to gather that skill. I fear we just don't have time these days.
If you have a friendly machine shop, who will maybe do the work when they have a spare hour for low cost, then it may be worth your while to restore an worn part, IF you can find the correct oversized bearings to go with it.
John
If you can feel the damage with your fingertip, then it is so deep that some metal must be removed to smooth the surface. There is no way that you can do this and maintain the correct profile without the aid of precision engineering machines, or the enormous skill of a master craftsman. In the old days, a scraper was a commonly used tool for final shaping of bearing surfaces! But clearances were greater then, and men had years to gather that skill. I fear we just don't have time these days.
If you have a friendly machine shop, who will maybe do the work when they have a spare hour for low cost, then it may be worth your while to restore an worn part, IF you can find the correct oversized bearings to go with it.
John
#3
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Just passed my test!
Posted 19 February 2012 - 12:07 PM
Basic engineering rule of thumb: If the part has been hardened and is pitted though wear and/or corrosion, bin it unless you can refinish the part by grinding to an undersize.
Edited by Wolfrace., 19 February 2012 - 12:07 PM.
#4
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Fast Driver!
Posted 20 February 2012 - 08:00 AM
I see !
I will set my offers accordingly - this way I can end up with paperweights only slightly overpriced....
lets see how bad they are when they turn up!
I will set my offers accordingly - this way I can end up with paperweights only slightly overpriced....
lets see how bad they are when they turn up!
#5
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Posted 20 February 2012 - 09:52 AM
For the camshaft if the rust pitting is on the lobes bin it, if it's on the bearing journals just sand the rust off.
For the mainshaft I wouldn't use a pitted one. But if you're desperate it will be ok for a few hundred miles.
For the mainshaft I wouldn't use a pitted one. But if you're desperate it will be ok for a few hundred miles.
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