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crankshaft rear main seal significant leakage |
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Hermie 
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Joined: Oct/25/2018 Location: Fargo ND Status: Offline Points: 10 |
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 Topic: crankshaft rear main seal significant leakagePosted: Oct/25/2018 at 6:18pm |
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My rear main oil seal has worn a noticeable groove into the crankshaft and results in significant oil leakage. (69 390 150,000 miles) I have not found a solution to this problem in the forum. New replacement seals might last up to 1000 miles before leaking again. I am unaware of an offset seal being marketed. I would like to thermal spray the seal surface, along with the bearing surfaces, and have them reground to stock specs. Have not been able to locate a thermal spray shop to do this type of work. My local engine/machine shops don't have the grinding wheel necessary to regrind the oil seal surface after it will be built up. Not interested in welding. Seeking sources and advice. Anybody else have this problem and how did you solve it?
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Trader
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Joined: May/15/2018 Location: Ontario Status: Offline Points: 6882 |
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Posted: Oct/25/2018 at 7:38pm |
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Crankshaft welding is quite common in trucking, industrial, cars etc. Have a read of this post:
I think you just have to look further a field. For some reason this is the wrong link and I cannot correct it, so just search "crankshaft welded". It's quite common. There's a youtube video of a 360 build showing them welding up the crank. I believe it made 460 HP.
Edited by Trader - Oct/25/2018 at 7:53pm |
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WesternRed
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Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5799 |
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Posted: Oct/25/2018 at 9:24pm |
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I had my 360 crank spray welded (presumably that’s thermal spray) at the seal location and then reground. You just need to keep asking around to find somewhere to get it done as it’s a bit of a specialist job and not many machine shops will do it. Trying truck shops is probably a good idea since their components are generally a lot more expensive, so more expensive repairs can be more easily justified.
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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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Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4866 |
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Posted: Oct/26/2018 at 8:36am |
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There's a machine shop about 20 miles from me that does submerged arc welding on forged steel components. It's an awesome process to watch. They chuck the crankshaft up in a very large lathe and straighten it after the welding has been completed, then grind the journals. The shop welds and offset grinds crankshafts to increase stroke and repair damaged journals. Some of the cranks go into pulling tractor engines, so the abuse they must withstand is immense. They use a wire feed machine and low-hydrogen 7018 filler wire, better than the steel cranks. the powdered flux comes out of a canister above and flows over the weld area. There's got to be a shop up there somewhere that can fix the journal for you. If nothing else, try the Metro area in MN. I know it's a pretty good drive from you, but the excuse you can use is taking the wife to the Mall of America. |
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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: Oct/29/2018 at 8:22pm |
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Spray welding is aka thermal spray. The reason I am asking the forum for help is exactly what you said: it is a "specialty job". Please advise with the source(s) that you used. Thanks.
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WesternRed
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Posted: Oct/29/2018 at 9:29pm |
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I’m in Australia, I just had to ask around quite a bit before finding somebody who could do it.
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I've finally given up drinking for good...........now I only drink for evil.
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amcenthusiast
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Joined: Jul/02/2012 Location: SW Atlanta GA Status: Offline Points: 1778 |
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Posted: Oct/29/2018 at 9:56pm |
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You might also websearch & call around and inquire about 'hard chroming' -this is fairly common for 'big rig' engines too? -to have their crank journals built up for rebuilding ...this might work good for the seal area... or 'spray welding'... these two methods would avoid need to re-balance the engine, compared to replacing the crank
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443 XRV8 Gremlin YouTube video: https://www.youtube.com/watch?reload=9&v=2DmFOKRuzUc
XRV8 Race Parts website: http://amcramblermarlin.1colony.com/ |
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WesternRed
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Posted: Oct/30/2018 at 1:17am |
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I think it would be cost prohibitive to try to do the bearing journals this way, one or two perhaps to correct damage.
In my case, I had already had the crank machined and rotating assembly balanced so already had a fair bit of coin invested. If the machine shop that did this work would have been on the ball and picked up the damage to the seal area, I could have just started with a better crank being that it was a 360 crank and fairly common. From memory, I think it was a couple of hundred just to repair the seal area, but machining costs are generally more expensive in Australia. |
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motorhead_1
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Joined: Apr/16/2014 Location: AZ Status: Offline Points: 1006 |
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Posted: Oct/30/2018 at 3:16am |
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do they make a repair sleeve for it like the ford 302 sleeves?
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69 SC/Rambler tribute 401/th400, 68 Rebel SST LSA, 66 F100 460/c6, 88 Merkur Xr4Ti, 71 Jaguar XJ6 LS1, 08 Supercharged Tundra
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WesternRed
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Posted: Oct/30/2018 at 3:32am |
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No, can't to a repair sleeve, the rear flange is larger in diameter than the seal journal, there is no way to install one.
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I've finally given up drinking for good...........now I only drink for evil.
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