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#1
09-03-2017, 01:13 PM
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New Cam Journal scratched
Hi all,
I was cleaning a new camshaft prior to lube and install and noticed a scratch on a journal. My finger nail catches on it if I run across it. Is it ok to install? Thanks Damian |
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#2
09-03-2017, 01:23 PM
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I polish all cams before I install them. Surface finish is usually not that good. If you have access to a lathe, chuck it up, spin it, and polish it with some 1000 grit sandpaper, and WD-40, with the sandpaper wrapped around something flat, like a small file, or block of aluminum. Don't worry, the file will not tear through the sandpaper, and start filing on the journal.
__________________
Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
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#3
09-03-2017, 01:50 PM
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Thanks for your response. I don't have a lathe, should I file it by hand?
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#4
09-03-2017, 02:07 PM
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I'll go with a back yard answer. Take a jeweler's file and softly dress the crest of the scratch down just a little and follow up with some 400 grit paper just in that small spot.
If you do nothing, the little high spot on the cam journal will carve out a small micro grove in the bearing and it won't hurt anything. It will simply end up being a small indentation in the Babbitt that collects a little additional oil. Cam bearings are very forgiving and the only thing they don't really like is too tight of clearances. I'd personally leave the remainder of the journal surface alone if you don't have access to a lathe.
__________________
Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon. |
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#5
09-03-2017, 03:36 PM
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Don't file it, use a file to hold the sandpaper flat on the journal.
__________________
Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
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#6
09-03-2017, 05:37 PM
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It will not be a problem (if dressed like suggested above), a Bare File on the area will just make more gouges in the journal.
Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#7
09-03-2017, 06:43 PM
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Quote:
If it's just a groove...leave it alone. Metal sticking up needs cut or polished down. Leather belt works good on really fine stuff and wont cut into the journal unless you get crazy with it. Fine ceramic type knife sharpening stones will cut down small stuff without cutting into the journal. If it does leave a mark, leather belt will polish it back slick as glass. Clay
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All the federales say,they could've had him any day They only let him slip away, out of kindness...I suppose Poncho & Lefty |
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#8
09-03-2017, 08:22 PM
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I'll stick with what I said. Jeweler's file is about a 1/4" wide and has extremely fine teeth. By definition it is what a jeweler uses to cure slight imperfections while working on rings and other jewelry. The goal is to stop prior to getting to the normal surface height, and there won't be any file marks.
__________________
Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon. |
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#9
09-04-2017, 12:00 AM
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Take it to your machine shop and have them polish the journal. They will do what Paul suggested, removing the scratch while keeping the journal round.
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#10
09-04-2017, 06:14 AM
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Rap some 800 grit paper lubed with wd40 around a wood 1/4" dowl to polish it .
Having a slight dip in journal is 100% fines you do not want any raised areas around the scratch.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#11
09-04-2017, 09:22 AM
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A middle tech solution is chuck it in a floor standing drill press lowest speed use a 1/2 bolt with head cut off to hold cam mask tape all ajoining lobes step wet sand with oil .. You can simply drag a file over the spot first a couple times then start oiled up 400 wet dry paper and go up from there .. auto paint store is a easy wasy to buy paper 1 sheet at a time. ... You can do the same thing by hand just takes more time
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