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I just fixed a couple months ago a john deere 655 (yanmar) I think that was the model with the same set up on the valve .He had overheated the engine and I think that made those o rings brittle so they started weeping .In the bottom of the hole that those valves came from there should be a copper compression sealing washer,that I think is the main seal to prevent leaks the o ring must take care of a lower pressure flow. replace all with the sealing parts with new ones replacing just the o rings might not take care of the leak,I know this by trying not to replace the copper sealing washers,I would try a diesel injector shop for the parts if they are not on a parts breakdown you have. lube the o ring with just diesel.
I certainly hope unreasonable pc has not come to this site,cause I have no idea what brought that on with the postings,just sayin
I assume you got all the caps back on pointing in the same direction as they came off. and maybe a different oil pump will make adjusting the oil pressure relief valve necessary.but now thinking was the engine run with low oil or no oil maybe you need to plasticgauge the bearings.
sorry it took a while but here is the info it is called kopr-shield conductive anti corrosion surface compound type cp8-tb manf.by thomas&betts memphis,tn.
I will use this stuff on any mixed metal regardless if it has power running thru it or not with no bad results ever.
not to beat this dying horse but I looked at the bottle I have and it says it is conductive it is even copper colored not that it means anything. it is what I have always used on electrical joints with dissimilar metals
back to the electrical grease I like it because you can coat the post and terminal before you place on the terminal on the post since it is conductive you will not add non conductive stuff into the sqeeze type battery terminal ,but that is just me fillin in the voids
fyi if you know a electrician ask them for the no oxide conductive grease they use on alum. wire in large connections like meter bases, panels or transformers.works great and gives you a never sieze properties also.
I sense a bit of temperal jealousy.but may be you should not worrying about getting that copper washer out.the ones that came out make sure that they fit correctly on the new glow plugs,yes it would be best to put in new ones,but if you torque it properly you should be able to reuse the one vs. tearing who know what trying to get it out. remember never sieze
