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Author Topic: Next! 16/2 Lister  (Read 1318 times)

38ac

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Re: Next! 16/2 Lister
« Reply #30 on: November 29, 2022, 11:28:09 AM »
Once again this engine has bit me. Because it has a newer. crank I am guessing that it suffered a broken one at some point which is common with the Amish users. There is an issue with the main bearing alignment that frankly I have not sfigured out how it could be?? Started out with the crank shaft going into a bind when the outside bearing caps were snugged up. Carefully checking showed the alignment of the outer caps is OK. The Center main bearing checked out to be proper diameter BUT is too low, binding the crank when every thing is torqued up. How can that be other than some change in the block? possibly due to the crankshaft breakage? Anyway since I (foolishly) let somebody talk me out of my horizontal boring mill I am building a bar to bore the center main into alignment with the outer mains. Pics on that later. Shown is checking for a bent crank with simple tools, two wood blocks, two steel V blocks and an indicator.
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ajaffa1

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Re: Next! 16/2 Lister
« Reply #31 on: November 29, 2022, 07:34:17 PM »
What an unusual problem, I would expect the cast iron block to crack rather than deform. Perhaps it was manufactured wrongly in the first place, which would explain why the original crank failed.
I am guessing you are going to have to skim the mating face of the main bearing cap first, then fit it and bore the center journal otherwise you will end up with an elliptical bore.
I am looking forward to seeing the custom boring bar you are making, it`s going to need to be strong and long. How much material are you going to have to remove?

Bob

cobbadog

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Re: Next! 16/2 Lister
« Reply #32 on: November 29, 2022, 09:33:09 PM »
Once you get all 3 main bearings line bored and aligned your problem may go away. Have you also had time to check for a bent con rod?
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38ac

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Re: Next! 16/2 Lister
« Reply #33 on: November 30, 2022, 12:59:44 AM »
At this point we assume nothing with this engine!
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32 coupe

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Re: Next! 16/2 Lister
« Reply #34 on: November 30, 2022, 10:16:17 PM »
How can that be ?
What did the old bearings look like ?

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38ac

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Re: Next! 16/2 Lister
« Reply #35 on: December 03, 2022, 01:28:20 PM »
The boring job
Found a length of 1 11/16" 1144 shafting in the rack to build the boring bar. Since somebody borrowed my 1/4 square broach and didnt bring it back I went with a 3/8" round hole a d used an old 3/8 drill bit to make the cutter. Two bushing were made up for a good fit inside the outside main bearings and a nice slip fit on the bar. To set the cutter I laid a straight edge across the bushings, The cutter is .001 proud over the straight edge. Took 7 hours to make all this, then 2 minutes to bore the center main shells using a slow drill for power. The center main web in this engine is twisted a bit, guessing from when the crank broke. Luckily Lister stayed with a thick babbit bearing which left plenty to straighten out the mess. Next guy might scratch his head but he will figure it out,,, if hes any good. Last pic is the shaft and cutter next to the center main ready to work, my phone is taking lousy pics, sorry.
« Last Edit: December 03, 2022, 01:30:18 PM by 38ac »
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38ac

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Re: Next! 16/2 Lister
« Reply #36 on: December 03, 2022, 01:37:38 PM »
Before boring the center main I also had to straighten out out the #1 side outside main bearing casting. I used the 2" ground shaft that I use to balance flywheels as a mandrel. Shimmed the housing tight by wrapping some shim stock around the shaft. Drove it with a lathe dog. When cutting I also had a center in the tailstock holding the shaft.
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BruceM

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Re: Next! 16/2 Lister
« Reply #37 on: December 03, 2022, 02:05:19 PM »
Very impressive work, Butch. I have recently enjoyed several boring bar and related tool fabrication videos by an Aussie machinist on youtube.  Its a fascinating process that takes a lot of knowledge and skill.

How did you make the drive connection to the slow speed drill motor?




ajaffa1

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Re: Next! 16/2 Lister
« Reply #38 on: December 03, 2022, 07:47:06 PM »
Well done Butch, an impressive solution to a tricky problem. I doubt you will ever need to use that boring bar again but it`s a nice tool to keep just in case, so don`t lend it to anyone, they may not bring it back.

Bob

38ac

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Re: Next! 16/2 Lister
« Reply #39 on: December 03, 2022, 09:23:09 PM »
Bruce, I drilled  and tapped the bar for a 1/2-13 cap screw and drove the bar with a socket and adapter in my Dewalt 18V drill. 
A man walked in the shop just as I was cleaning up the block and asked if for sale and how much, gave him a price and its sold. Guess I'll have to work harder at getting it done now
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38ac

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Re: Next! 16/2 Lister
« Reply #40 on: December 03, 2022, 09:27:57 PM »
Bob, I typically don't lend tools, or anything else. As I was looking for the broach I remembered loaning it, called the guy but he claimed to have never borrowed it. I didn't argue with him but ah the fun I will have telling him off the next time he needs something!
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BruceM

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Re: Next! 16/2 Lister
« Reply #41 on: December 03, 2022, 10:44:32 PM »
Brilliantly simple boring bar drive, Butch.  My favorite kind of solution.   

cobbadog

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Re: Next! 16/2 Lister
« Reply #42 on: December 04, 2022, 04:24:32 AM »
I've been watching some videos from CEE an engineering firm specialising in boring out worn bushes etc in heavy earth moving stuff. when he sets up his boring bar he uses a pair of cones that centralise the boring bar rod as he tack welds the brackets to the part/s being bored.
Like every good tradesman, both you and he make it look and sound easy. Well done.
I had an episode recently about a tool that went missing. I thought I had lent it to the guy across the road so I politely asked him if he had it and he said no but he did have a sledge hammer the same so I borrowed it. The more I looked at it the more I thought this is mine and then sometimes said no it isn't. I took it straight back as soon as I had finished with it and thanked him. 4 days later I stubbed my toe on my one. I put it back in a place that I never put it. Ageing can be a bugga.
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glassblower

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Re: Next! 16/2 Lister
« Reply #43 on: December 04, 2022, 04:57:51 AM »
I hate loaning tools out and after never getting a couple back I started something new. Top drawer of my tool box is a stack of index cards. When I loan a tool, in front of the guy I fill out a card, put his name , date, the tool and have him sign it. Never had a problem since...hate to do that to friends but explain I'm getting old and forget where one of my tools went and they laugh and understand.
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broncodriver99

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Re: Next! 16/2 Lister
« Reply #44 on: December 04, 2022, 05:21:55 PM »
I've been watching some videos from CEE

I have been watching him for a couple of years now as well. A very interesting channel. He does some big work and is a master at welding. I am guessing a lot of his customers are in the mining industry.