Case 680E

[propane1]

Other thing could be piston split in half at one of the rings. Normally at the oil ring. So the top half of the piston is at top dead centre, and the bottom half is moving up and down. Zero compression in that situation.


Noel

[Eugen]

They who said hole in piston might be totally right. Took a short video through the injector hole with a bore scope cam I had around, while turning the engine so the piston would go down. Not sure if there's a hole but it looks pretty banged up.



https://vimeo.com/720912735

[Eugen]

Guys, thank you for the good advice! @Spike188 it's not easy for me to do a blowing air test now because I dug out the buried power cable going to the shed so, no power for the compressor.

I had the bore scope and hoped to see something relevant with it.

I'm pretty sure the head's got to come off and then I'll know for sure what's what.

However, I'd rather do that after I get the work for the addition done, as that's the real priority and time sensitive too. Can't think of a big downside doing some more work with the backhoe as is, do you?

[Spike188]

That is how the fuel was getting into the oil. What would be wrong with removing the injector and returning the fuel to tank. The problem created might be galling the piston to the sleeve and breaking a rod due to lack of lube. Will there be enough oil sling to keep the sleeve lubed. Would plugging the breather force enough oil past the piston to keep it lubed?

[DavidBarkey]

Looks like the side of the piston has gone to parts unknown . If that is the case as it looks to be . I would remove the injector . redirect the fuel back to the return lines disabling that cylinder for now . install a "breather " in place of the injector . this will keep a lot of the pressure off the crankcase . keep rpms to a minimum ass with a dead cylinder you are out ballance power wise . Take it easy and get you work done . Then it can be sold as is or delt with. Bring me the injector and I can machine a breather tube to go in there .

[propane1]

That’s not lookin good Eugen. That’s to bad.


Noel

[FUTZ]

That's a pretty good image from the borescope. What brand or resolution is it? I bought a DeWalt unit tens years ago and returned it because I couldn't make out any images; I bet they have improved a fair bit since then.

[Eugen]

That's a pretty good image from the borescope. What brand or resolution is it? I bought a DeWalt unit tens years ago and returned it because I couldn't make out any images; I bet they have improved a fair bit since then.

This one, got it more than a year ago from amazon

TAOPE Wireless WiFi Endoscope, Waterproof Flexible Borescope Inspection Camera 2.0 Megapixels for Android and iOS Smartphone, iPhone, Samsung, iPad https://a.co/d/btNvoug

[Eugen]

Yeah, I'm thinking along the same lines as you guys. It's really good to have you chime in. The idea of piping the injector line in to the return I like, though finding the right hose might prove difficult.

Leaving the injector hole open as a "breather" is easier done, as I can use the adapter from the compression test as an outlet for a hose.

Good point about the imbalance on the crankshaft when running on three cylinders @DavidBarkey.

@Spike188 It is indeed a sleeved engine, and found kits for one, or more pistons, some kits are complete with all gaskets, some not.


Hope this could be done without pulling the engine out, as that's definitely not something I would want. In fact my hope is that I could replace the sleeve and piston without pulling the crankshaft out. Don't know if that's possible though.

Anyway, it helps me to write here what I do with this backhoe, as well as as to get feedback from you guys, but I am aware that I might be annoying some or all of you with a discussion about a tractor that is not a Case garden tractor. My personal preference about this forum is that people should feel comfortable to share anything they want, just like you would do in the presence of a bunch of friends. Of course, not losing sight that we still talk about Case garden tractors. Please feel free to share your thoughts.

[Eugen]

I found a picture of what the piston should look like, which makes much more sense about what I've seen through the bore scope. There are indents for the valves, and some sort of hole with a cone in the middle.