Welcome back Ade, missed my daily fix.  All good on my side.

Thank You as always Ade. Were lucky to have you at the helm.

Very nice!

Cool demo of Ackermann steering too...

Hello again.
I am confused about a few things. 1- In order to fill the valve clearance, I need to find the top dead center of the engine. Is this possible using a thin rod that sits on the piston through the injector hole and moving the piston accurately? Because I was unable to find the mark on the flywheel.
2- Adjusting the compression lever also requires top dead center, which I guess is caused by the engine locking up at a certain point due to its incorrect adjustment. 3- In the manual for calibrating fuel pumps, there is a mark (A)(B in picture) that is defined by a certain amount. While in my engine, this size is not correct and is even negative (5 mm). When the comb reaches the far right, the fuel is cut off. 4- I do not know how to work, arrange, and adjust the part shown with the letter A in the photo.

Hello and thank you for your help and advice.
 Stuck, not locked. That is, I turn the handle but it gets stuck somewhere and doesn't move. Of course it goes backwards. I also feel like it's a physical collision. And of course it's caused by temperature. Another thing is that when it turns off, a lot of black smoke comes out. My guess is that the fuel settings are messed up. Also, it burns about 10 liters of diesel every 4 hours under load. Of course, I don't know if this is a standard amount or a lot!

Black smoke is suggestive of over-fuelling - you would typically get black smoke when increasing throttle under load. But it's also burning - unburnt (or partially burnt) is light grey smoke (and often lots of it). I think you're going to need to whip the heads off immediately after it's failed to determine the cause. It kind of sounds like it might be hydro-locked, i.e. enough raw diesel has built up in one of the cylinder heads to prevent the piston from completing a stroke - except if you operated the decompression lever, that should let it roll all the way over.

With respect to the fuel consumption - I don't know... but if you can tell me roughly what RPM you run it at under load (assume when it's working OK!), then it should be possible to calculate an efficiency, which should tell us if it's in the ballpark or not.

If you're pretty sure it's overheating, then the things to look at are the fan on the flywheel (make sure it's not clogged up with stuff), and also the fins on the cylinders (also need to be clean and clear). Although if it's any consolation, I have a lawnmower engine which overheats for no apparent reason... and despite cleaning it thoroughly, it still refuses to behave.