Case 680E

[Eugen]

Eugen you might want to put some wood between your puller and the top of the block to help prevent damage to the block.

I'm interested in how you will install the new sleeves.

Matt, it's a good idea and I thought about it myself too, but the threaded rod was above the bracket one thread, literally. Anything under the bracket would not allow the nut to catch on the thread. I was also not overly concerned because there was no impact, just pressure, and thought the block would not get damaged. However, in the excitement of the moment I forgot to check the block after I pulled it. Will check and let you know if I made a booboo.

[Eugen]

Great work @Eugen! - It might be worth checking if there is a preferred lubricant for the new o-rings when the time comes to install the new liner, don't forget to do a test fit without the o-rings so you can check protrusion of the new liner...

Thanks Gerry! The service manual calls for petroleum jelly. I've seen other people used soap with water. I think I'll do what the service manual says. Good call on checking the protrusion of the liner without o-rings. The manual says so too. I do have a dial indicator, but am not sure yet how I'll keep it steady and how to reliably measure the difference between the liner top surface and the block surface. I suppose if I had two dial indicators I could create some sort of fixture and install them in it next to each other. This needs more thinking.

@MattA I plan to use two head bolts and fab something similar to the tool in the service manual (see below).

[Eugen]

@DavidBarkey , @JSinMO , @Spike188 makes sense what you guys say. Will pull the other head off too. The compression test on the other three cylinders was between 350 and 400 psi, which is pretty low. I do want to change all the sleeves and pistons, but have doubts that I can work on the cylinder which is located right above that cross member of the frame. Even with the engine raised it's a very tight space. Will see when I get there.

@JSinMO working on that tractor outside, with the sun shining, I want some of that. Instead of the freezing temps, more snow, and the wind howling.


Was curious about the valves, so on goes the valve spring compressor and off come the valves. But no measuring tonight, too tired.

I'


I'll redo the valve face but don't have a seat cutter this big.

[propane1]

Great progress Eugen. Will just like new when done.

Noel

[DavidBarkey]

I do not have a cutter that big either . Locking good so far . Do you have a good straightedge to check for flat on the head ? If the heads are warped at all , it would be worth while to have them decked and the seats cut . Then you can do the rest .

[Eugen]

@propane1 I don't expect it will be like new, would be happy if it works good enough to get some work done.

I do not have a cutter that big either . Locking good so far . Do you have a good straightedge to check for flat on the head ? If the heads are warped at all , it would be worth while to have them decked and the seats cut . Then you can do the rest .

No, I don't have a straight edge so accurate. Do you know anyone local you would trust with the head and seats job?

[DavidBarkey]

@propane1 I don't expect it will be like new, would be happy if it works good enough to get some work done.

I do not have a cutter that big either . Locking good so far . Do you have a good straightedge to check for flat on the head ? If the heads are warped at all , it would be worth while to have them decked and the seats cut . Then you can do the rest .

No, I don't have a straight edge so accurate. Do you know anyone local you would trust with the head and seats job?

We use to use Preston's Cylinder Head & Engine Rebuilding Have not used him in years . There is a shop in Midhurst as well . Never used them .Canadian Cylinder Head Technologies.
I have one that I use you can borrow. It is not high end but it is close enough to tell if they need machining .

[Eugen]

Thanks Dave!

Quick question. On smaller engines it is considered good enough to use a sheet of glass for checking head warpage, would it not be good enough for this?

[DavidBarkey]

Thanks Dave!

Quick question. On smaller engines it is considered good enough to use a sheet of glass for checking head warpage, would it not be good enough for this?

Yes but I would put the glass on the head as opposed to head on glass do to the weight .Check the manual , but I think after cleaning up the surface , anymore than 0.003 and I would have it decked and seats cut .

[Eugen]

Yes but I would put the glass on the head as opposed to head on glass do to the weight .Check the manual , but I think after cleaning up the surface , anymore than 0.003 and I would have it decked and seats cut .

Manual says less than or equal to 0.005 is acceptable for this head. Which makes me think that the sheet of glass would be ok as a test. But it'd be nice to have extra long feeler gages. There, that's a tool I don't have.

I'll ask Mike if he can cut such large seats.