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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

Saving a crank


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  #1  
Old 11-23-2012, 09:32:13 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Saving a crank

Trying to knock out some projects, started on this one this evening. It belongs to a friend, goes in a Chicago marine engine. It evidently broke a rod and jammed at one time, had some crankcase damage and the huge flywheel twisted the crank. It was straightened and put back into service. I welded it in my lathe, I have a variable speed DC motor I belt to the regular motor, lets me turn it slow. The mig gun goes in the tool holder, lathe is set for threading. I made a ground attatchment out of a starter end, uses the brushes, made a slip ring to replace the commutator, has a trough to retain the shielding gas. I've welded a lot of cranks, rough turned them and sent them to the machine shop to be ground. They did them but you could tell it was a nuisance job for them.I bought a Storm Vulcan crank grinder at an auction, it's an older one but it was still in operation, I've gone though it and freshened it up, re-doing some neglected items. I've ground one crank so far, came out right, this will be the second.
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Last edited by J.B. Castagnos; 11-23-2012 at 10:10:26 PM.
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Old 11-23-2012, 09:52:11 PM
Pat Barrett Pat Barrett is offline
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Default Re: Saving a crank

Jerry Wood, would be proud of you if he knew what you did. Ha ha. Great job, Keep those folks happy. Pat
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Old 11-23-2012, 10:25:52 PM
cdr cdr is offline
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Default Re: Saving a crank

J.B. Costagnos, I sure would not mind living in your neighborhood. I know I would be a nuisance in your shop trying to learn and hoping you would share your knowledge and machines.
Carl
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Old 11-23-2012, 10:46:34 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Saving a crank

Carl, if you were closer you would be welcome, we have several work days a year at the shop, usually 15 to 20 people, pouring bearings, sleeving cylinders and making parts.
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Old 11-24-2012, 10:19:19 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Saving a crank

Set the crank up in the grinder today, started playing with it. It's still .020"over but I was able to grind it to the dimensions I wanted, sneaking up on the final cut, a quick check with dial calipers and everything seems to be good
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Old 12-01-2012, 09:56:05 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Saving a crank

I've been working on the crank when I get time. I made an adapter for the grinder so I can grind all the way to the end. On cranks I sent to the crank shop they came back with unfinished ends, I would put them in the lathe and machine them. I had an extra #5MT live center for my big lathe, mounted it in the crank grinder and cut it to 1.250", same as the dead centers in there. Installed on the tail side, I dialed in the shaft and I locked the tail head so it wouldn't rotate, the live center handled that. Now the crank can be ground to the end, turned around and grind that side to the end. The dead center was reinstalled and the stroke was set for 5", dialed it in and ground the rod journal. I have one more cut before finishing but some of the local guys want to see how the machine cuts the rod journals, saving it for show and tell.
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Old 12-01-2012, 10:18:28 PM
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Default Re: Saving a crank

Interesting and impressive!Nice that you have the experience and a place to do it.
Thanks for taking the time to post
Dan
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Old 12-01-2012, 11:05:40 PM
73eldo 73eldo is offline
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Default Re: Saving a crank

Way cool. Love to see those old machines put to use to keep other old stuff alive.
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Old 12-02-2012, 08:06:29 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Saving a crank

The crank is finished, next project will be a belt polisher, planning to use a 4" grinder and pulleys from a serpentine belt tensioner and timing belt idler. This is my first time grinding a full crank, did the crank pins on another. I should have put the steady rest on the crank pin, the radius area was wedge shaped and the difference in pressure between hitting it and not was flexing this long slender crank causing almost .002" out of round. This motor isn't going in a boat, it will only be for show, I can live with it. I have 4 more to do, hoping to get better results as I go along.
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Old 12-03-2012, 11:41:07 PM
swebre swebre is offline
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Default Re: Saving a crank

Excellent write-up JB. Thanks!
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Old 12-04-2012, 05:17:37 PM
Jeff Smith Jeff Smith is offline
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Default Re: Saving a crank

Thank you very much for your post. It was very informitive.

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Old 12-05-2012, 12:07:25 PM
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Default Re: Saving a crank

JB, finish looks great on the crank. Would like to have a crank grinder in my shop but they are not very cheap. There are a few used cranshaft grinders on Ebay now. Two Storm Vulcans one for $20,000.00 and another for around $8,000.00 and a van Norman for $18,500.00.

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Old 12-05-2012, 09:25:29 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Saving a crank

John, I got mine at an auction, company closed when the owner died. It was still in operation, but they specialized in compressor cranks at the end, two cylinder cranks. Something popular in the oil industry. It came with 5 stones and a lot of
accessories, I had to go over it, a lot of temporary shop repairs to keep it going. It was $3800 by the time I got it out of the door.
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Old 12-07-2012, 09:22:09 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Saving a crank

I finished another one today, this one was sent to a crank shop, I guess it was poor communication. They ground only the main bearing area, the engine has sleeve bearings, you wouldn't be able to slide an .010" under bearing over the standard part of the crank, if ground to the end the coupling would have been loose. I welded it, roughed turned it in the lathe, finished grinding today.
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Old 12-09-2012, 02:46:47 AM
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Default Re: Saving a crank

JB, is any kind of heat treating necessary after welding these old cranks?
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Old 12-09-2012, 12:39:04 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Saving a crank

These cranks are not hard like newer engines, when straightening one it doesn't take much over bending to correct it. When welding the crank gets red hot, i just let it cool, it seems to aneal itself. If you weld a small spot on a cold crank it hardens and is very hard to machine. When the whole crank is welded it machines just like the original. I use the mig and 70,000 psi mild steel wire, I think this may be a little harder than the cranks, but I was told that when welding it blends in and you get a mix. We have some of the welded cranks running in boats and no problems yet.
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