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crankshaft rear main seal significant leakage |
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tomslik 
AMC Addicted 
Joined: Mar/07/2008 Location: Colorado Status: Offline Points: 680 |
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 Posted: Oct/30/2018 at 4:41am |
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just a thought but how about a rope seal? don't know what would fit but....
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67 american 290/4speed |
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White70JavelinSST
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Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4867 |
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Posted: Oct/30/2018 at 8:44am |
Here's the company I was referring to. Don't think they do spray welding. Dunno if the submerged arc process might be more affordable and more effective. They're about 320 miles from Fargo. It's a very busy shop. Z Machine 932 Main St, Ocheyedan, IA 51354
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70 Javelin SST, second owner, purchased 1972
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Trader
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Joined: May/15/2018 Location: Ontario Status: Offline Points: 6880 |
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Posted: Oct/30/2018 at 10:28am |
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And there is this shop closer to you:
Cannot vouch for their work or cost, just google "crankshaft repair", there are quite a few.
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White70JavelinSST
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Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4867 |
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Posted: Oct/30/2018 at 1:00pm |
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and there's gotta be more shops that would do the work, and possible not so far away from Fargo too. There's gotta be a ton of tractors and trucks up there that need machine shops to fix cranks. I'd go to one of the local machine shops and start asking....
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70 Javelin SST, second owner, purchased 1972
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Hermie
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Joined: Oct/25/2018 Location: Fargo ND Status: Offline Points: 10 |
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Posted: Nov/24/2018 at 2:42pm |
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Have found sources nationally that know how to flame spray material, grind to size, and do the knurling. This should not have been such a problem to find shops to do this kind of work, as the big three incorporated AMC's knurling design into their crank rear seal as well. Marine Crankshaft Inc. (P) 714-549-2388 (F) 714-549-1382 Email- cacranks@yahoo.com 2155 So. Grand Ave Santa Ana, CA 92705 |
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6PakBee
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Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5457 |
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Posted: Nov/24/2018 at 3:08pm |
Why don't you call up Federal Machine in Fargo and talk to them. If they can't do it, I'd guess they'd know who does. I think it is interesting that they would knurl the repaired area. Must be using a carbon steel powder. The carbide spray coatings I'm used to on pump shafts would crack if you tried that.
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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WesternRed
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Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5798 |
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Posted: Nov/24/2018 at 5:36pm |
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Here is my one before and after repair for reference, they definitely did not want to knurl the new surface.
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I've finally given up drinking for good...........now I only drink for evil.
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White70JavelinSST
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Posted: Nov/26/2018 at 9:34am |
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The submerged arc process doesn't peel off when knurled because it has truly become the same as the journal. If you think it necessary to knurl the surface after the repair, you may wish to have it welded using the submerged arc method. The method I've seen uses a wire feed machine. The filler material was 7018 low hydrogen. That material is as tough as the base metal.
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70 Javelin SST, second owner, purchased 1972
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bobsterfl
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Joined: Jun/18/2009 Location: Orlando, Fl Status: Offline Points: 261 |
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Posted: Dec/10/2018 at 4:29pm |
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Hermie is right on regarding the "knurl" on the rear main seal surface, and the pictures provided by Western Red show what that looks like. As I remember, the purpose of that directional "knurl" is to minimize the amount of oil that escapes past the seal. As the crank rotates, the "knurls" help pull oil back in towards the crankcase. I think any repaired surface without the "knurls" is going to result in more leakage than a stock crank with the knurls.
Secondarily, any engine with excessive crankcase pressure (piston ring blowby or inadequate venting) will surely result in excessive rear main seal leakage. Sure hope you are able to save your crank!
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Bobsterfl
1970 BBO Javelin 390 - Torqueflight |
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Trader
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Joined: May/15/2018 Location: Ontario Status: Offline Points: 6880 |
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Posted: Dec/11/2018 at 6:27am |
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Yes the knurl is here to "pump" oil back into the engine. A club member near me had an crankshaft repaired and no-one noticed they knurled it the opposite direction. Well oil did pump out of the end of the crankshaft very efficiently.
The shop paid for the tear down and re-repair of the crankshaft, but not engine removal or the new clutch. The wet clutch experiment was a flop! Most industrial equipment just has a smooth shaft and oil seal with a shield as pictured above to stop oil flowing straight down the shaft. Mind you one piece seals. They are static pieces of equipment though and the oil is not thrown to the back as it would in acceleration. Only time will tell how well this will work.
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Hermie wrote: