Case 680E

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Eugen Canada
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Re: Case 680E

Post by Eugen »

A step closer. This is what the aluminum pipe expander looks like with the propane bottle sleeve on it. The inner black material is steel though.

2F2E60F4-9822-4CC3-85C5-AB73E0C3FD2C.jpeg
EDE24FDF-1EB7-4E30-8E9B-318EE34AEC34.jpeg

The propane bottle is quite thin, still I'm hoping it's enough to provide dent protection to the aluminum colet.
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Re: Case 680E

Post by DavidBarkey »

@Eugen It will be more about protecting the aluminum from the heat from heating dent to push out and spreading out the load .
Now you need a way of holding the expander from turning when tightening and at the correct height in the cylinder .
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Re: Case 680E

Post by Eugen »

DavidBarkey wrote: Mon Aug 22, 2022 4:50 pm Now you need a way of holding the expander from turning when tightening and at the correct height in the cylinder .
Yep
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Re: Case 680E

Post by DavidBarkey »

Eugen wrote: Mon Aug 22, 2022 6:32 pm
DavidBarkey wrote: Mon Aug 22, 2022 4:50 pm Now you need a way of holding the expander from turning when tightening and at the correct height in the cylinder .
Yep
I am going to assume that the steel is hardened and tempered . So tapping it may not work , but may be able to weld a rod to the side of the top half . Note take the wedge nut out of the bottom and put some grease on it the wedge and the threads .
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Re: Case 680E

Post by Eugen »

@DavidBarkey I was able to tighten the expander right at the entrance of the tube, just enough as to touch the sides and have some friction. Then I used many 6 inch extensions to push the expander to the dent, having marked the extensions before. The friction between the expander and the tube was enough to allow me to tighten it more. I just meant to do a little mock up, but if I got so far, I whipped out the plumber acetylene torch and heated the spot, then put the impact wrench on and tightened it up as much as it could go. Obviously the plumber torch didn't get the tube red, so I don't think this put out the dent, but it seems to me it's a little better now.

I did get an idea though. To do this again, and while the expander is in there, hammer carefully around the dent with a hammer.

It turns out that my cylinder hone is actually a brake cylinder hone and is not big enough to do 4" diameter. Maybe I'll run to Canadian Tire see if they have a cylinder hone that can do 4". :inacall:
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Re: Case 680E

Post by Eugen »

Did another round of torch and pipe expander, this time with more force on the expander using a 1/2 inch drive breaker bar. I realized that the impact gun cannot put a lot of force on the 28mm socket within such a long extension. Also used a hammer around the dent after the pipe expander was super tight.

The dent can still be seen on the inside but much smaller to my eye.

Then I taped a 60 grit sandpaper to a long cardboard pipe with a wooden handle down the middle and proceeded to scrub around the dented area. Sort of like loading a musket movement. I could feel a little rougher surface in that area. After a while I switched to 220 grit.

Used a telescoping gauge to measure the bore size at the head of the tube and at the dent. Can't say it's a very precise measurement but the dent seems to be 0.034 inches in (0.864 mm). I call that acceptable. Will do my best to align the piston dent with the tube dent and install the new seals when they arrive. The ants are marching one by one... :D
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Re: Case 680E

Post by thebuildist »

Ok, call me impressed. It seems you've gone about this a very logical and straightforward way, and as my British friends would say, "That's a result!"

Bob
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Re: Case 680E

Post by Eugen »

Thank you guys, for the kind words, and also for allowing me to document what I'm doing here. The truth is that I'd rather have this done here on our forum than on a forum belonging to someone else. This place feels more like home, and it's my hope that all of you find it that way too.

The correct and fresh seal kit arrived. Was curious what the service manual has to say about torquing the piston bolt. Well... they thought it's worth picturing the guy with a big breaker bar.
Screen Shot 2022-08-26 at 14.58.00.png

The torque specs eh? - a not too shabby 1000-1200 ft-lbs
Screen Shot 2022-08-25 at 15.20.55.png

That's gonna be fun. No, I don't have a torque wrench for that. :114:
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Re: Case 680E

Post by DavidBarkey »

As the old timer said to me once when I asked how tight to do it . "Tighten er up till she strips , then back er off half a turn "
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Re: Case 680E

Post by DavidBarkey »

1000 ft lbs is only 200lbs at 5 feet.
5 foot bar with a 200 lb man on it , will stop moving when 100lbs are reached . @Eugen you might have to fill you pockets with lead weights though .
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