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Hit & Miss Gas Engine Discussion Meet collectors of hit and miss engines, ask questions about collecting, restoring and showing antique flywheel engines.

Hit & Miss Gas Engine Discussion

Crankshaft repair


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  #1  
Old 09-12-2009, 10:47:37 AM
John Savot John Savot is offline
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Default Crankshaft repair

Can a badly rusted crankshaft be turned down and sleeved
to bring back to original diameter or is some sort of welding
and then machined required?

John
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  #2  
Old 09-12-2009, 11:05:56 AM
Sky
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Default Re: Crankshaft repair

Normally it's done by welding the crank and cutt'n it back down to size. I've never heard of sleaving a crank before.
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Old 09-12-2009, 03:52:10 PM
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Default Re: Crankshaft repair

Yep sleeving is used , Craig Andersons website shows him doing one on a bent crank. Heck of alot easier than welding it up!
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  #4  
Old 09-12-2009, 06:32:16 PM
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Default Re: Crankshaft repair

Sounds like you're thinking of a Speedi-Sleeve
http://www.alliedbearings.com/mfg_pr...edi/index.html

J.I.M.
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  #5  
Old 09-12-2009, 08:12:54 PM
Sky
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Default Re: Crankshaft repair

Nifty. Thats a new one on me. Does this apply to all sizes?
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  #6  
Old 09-12-2009, 08:35:21 PM
pegasuspinto pegasuspinto is offline
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Default Re: Crankshaft repair

most any machine shop is equipped to weld up and turn down a crank, not a big deal at all.

Robert
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  #7  
Old 09-12-2009, 11:37:43 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Crankshaft repair

If the journal is the same size all the way through the flywheel turning and sleeving is not an option. If it's larger in the main bearing area it can be turned and sleeved, otherwise you couldn't get the sleeve over the area where the flywheel goes.
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  #8  
Old 09-13-2009, 01:41:39 AM
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Craig A Craig A is offline
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Default Re: Crankshaft repair

Quote:
Originally Posted by IronCity2006 View Post
Yep sleeving is used , Craig Andersons website shows him doing one on a bent crank. Heck of alot easier than welding it up!
Thanks for the mention but we never sleeved a crankshaft.
Depending on where the shaft needs welding, in this case a main bearing surface probably, it is something of a big deal to weld and turn because no matter HOW you do it the shaft is going to warp so straightening is the next order of business and sometimes (usually) it's not all that easy.......
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  #9  
Old 09-13-2009, 06:41:56 AM
John Savot John Savot is offline
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Default Re: Crankshaft repair

Thanks for all the replys. Next question is: who has first hand experience with some one that can do a good job and what is the approximate cost?

John
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Old 09-13-2009, 10:51:18 AM
ronm ronm is offline
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Default Re: Crankshaft repair

The other problem w/welding on crankshafts is breakage-they tend to crack right at the edge of the weld. My old machinist buddy could be persuaded to weld a crankshaft, but the warranty was, if it breaks you own both pieces....
BTW-a speedi-sleeve is intended more for repairing a sealing surface where the seal has worn a track around the shaft.
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  #11  
Old 09-13-2009, 11:11:52 AM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Crankshaft repair

I've been welding cranks for marine engines, haven't had a problem with breakage yet. I use a mild steel wire and weld the completeshaft while it's hot and allow to cool slowly. I've noticed that if you weld a small spot and try to machine it it's hard to cut, probably because it chilled. Some of the marine engine guys had their cranks welded by a crank shop and they broke in a cone shape at the end of the weld, I think a stress was set up, also the weld may have been a hard material as used on modern cranks. Thes cranks are soft and they flex. If you surface with a hard material that doesn't flex it will crack and the crack will migrate through the shaft. Here's a link to how I do it.

http://www.oldmarineengine.com/discu...html#POST18223
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  #12  
Old 09-13-2009, 08:55:30 PM
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Default Re: Crankshaft repair

"Normalizing" the weld area after welding by heating to a red or even "orange-ish" heat and holding it there for a short while will allow carbon to migrate away from the weld area, redistribute itself and greatly reduce or eliminate breakage.......
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  #13  
Old 09-13-2009, 10:58:45 PM
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Default Re: Crankshaft repair

Speedy sleeves are to press on shafts that the seal has worn a groove in. They are not for bearings.
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Old 09-14-2009, 06:33:51 AM
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Default Re: Crankshaft repair

John,

How bad is the crankshaft rusted? If the diameter on the crank shaft for you main bearings is larger then the diameter on the crankshaft for your flywheel hole then you may be able to have the crank ground and pour new babbit bearings.
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Old 09-14-2009, 06:53:05 AM
John Savot John Savot is offline
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Default Re: Crankshaft repair

The area under the crankshaft gear is mainly in question. Also
outside of the flywheels. My mentor, Tom, says rulers are for
lumber and micrometers are for engines, however, in this case
a ruler works fine on the ends of the crankshaft.

John
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  #16  
Old 09-14-2009, 08:44:30 AM
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Default Re: Crankshaft repair

Here is a method for sleeving shafts that we used in press repair work. I have not tried it and am not recommending it for engine repair although it may work. The strength of the shaft will be reduced by the amount of metal removed from the diameter of the shaft. (see the thumb) When undercutting the shaft make a LARGE radius at each end of the cut. Make the sleeve to fit the undercut with a few thousands of an inch more on the outside diameter. After the sleeve has been cut in half and veed for welding clamp the two halves to the shaft and tack weld ONE side of the bushing at both ends. Now carefully preheat the entire sleeve to a blue color (about 600 degrees) , no more, and tack the other side of the bushing together. allow everything to cool to room temp. (don't finish welding the bushing). now remove the clamps and tap the bushing with a small hammer to see if it is tight on the shaft You will know by the sound. If it is tight finish welding with a stitch weld, no more then 1/4" at a time, in different areas. Turn the O D to size and you are done. do NOT weld the sleeve to the shaft as this is just asking for trouble. We repaired several large shafts this way and never had a failure but again I am not recommending this method for engine repair although if done correctly it should work.

Iron Wolf
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Old 09-14-2009, 09:07:07 AM
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Default Re: Crankshaft repair

Quote:
Originally Posted by ronm View Post
The other problem w/welding on crankshafts is breakage-they tend to crack right at the edge of the weld. My old machinist buddy could be persuaded to weld a crankshaft, but the warranty was, if it breaks you own both pieces....
BTW-a speedi-sleeve is intended more for repairing a sealing surface where the seal has worn a track around the shaft.
Should have been clearer on this-he wouldn't guarantee a Diesel crank, he did have a dedicated crank welding machine & built up lots of gasser cranks. Even used to do strokers, built up one side & grind off center.
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Old 09-14-2009, 11:32:04 AM
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Default Re: Crankshaft repair

John,

Here is the info for a company that repairs crankshafts from lawn mowers to locomotives, I highly recommend them, they do excellent work and are fairly priced. They are: Crankshafts, Inc. 872 Four Rod Road, Berlin, CT 06037, (860) 829-1002. They did an excellent job on my badly pitted CH&E crank, they welded and reground it, looked like a new crank when I got it back, very satisfied with the results.
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Old 09-14-2009, 11:38:33 AM
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Default Re: Crankshaft repair

John,

This company can fix your crankshaft if you do not want to do it yourself. You will have to call to see how much it will cost. I had them do the crankshaft for my Detroit two cylinder.

Revmaster Machine And Parts

5358 Old Winter Garden Rd Orlando, FL 32811
(407) 295-7691

http://www.realpages.com/sites/revmaster/
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Old 09-15-2009, 09:58:59 AM
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Default Re: Crankshaft repair

I recently had the crank for one of the flywheels spray welded and then turned down. The shaft does not get hot enough to cause any warp. It worked very well for me and did not cost an arm and a leg. It was done at the local machine shop. But you have to get someone who knows what he is doing because there are many different spray compounds for different metals and apps.

Last edited by Dan Wiese; 09-15-2009 at 10:04:47 AM. Reason: i made a mistake
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