Just to share: My brother, a farmer in another part of South Africa thought that I may have the big end too tight. When I re-assembled I did not have a torque wrench small enough to tighten the big end bolts so I added lock-tight to the bolt threads and tighten them to my best guess. Scared of causing damage if I keep running it for 5 minutes each time before it wants to seize, I have now pulled the engine to have a look. I have also purchased a small torque wrench and decided to test if I had the bolts over-tight. Well, I did not, and proceeded to tighten them to the recommended 24Nm. Then I could hardly turn the crank and decided to take the rod and crank out so that the engineering shop can re-check the tolerance. Unfortunately, as of tonight, I cannot get those two bolts loose! The 10 mm socket I use already started to slip. I have chissel-ed on the shoulder of the bolts but the little buggers still won't move. In the end I may have to sacrifice the rod to get the crank out of the casing for more space. Any suggestions how to get those bolts out, will be most welcome.