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Hello my friends and helpers, finally i found time to dissasemble the engine. Here are the results

The filterscreen was clear with no metal parts or other particles. iam the first owner with round about 9h. It was used when it was frosty outside and was loaded with a 1500W heater. It stopped working suddenly. Before it was runner for two hours. i think i cant get along a teardown

I will answer the other questions later

There was no leakage after relapping. The spraypattern looks like it should, compared to YouTube Videos. Nice straight 4 sprays. I changed the oil when the generator came to my shop. No shiny metal or something unnormal. Used but ok. Even with diesel direct to the inletport it wont fire up...

After relapping the valves and double check them with break cleaner, the engine still does not start. Next step is to check the pistonrings. I didnt wanted to tear the engine apart but i have no other joice i guess

The valves and seats look good. I will refit them after lapping. The leakage was minimal. Also no exhaustgases in the intake

I finally managed to get the head off. Nothing to see unnormal for me. I tried some breakcleaner to the intake and had some light dripping through the closed intakevalve. Not much but something

Thank you for your replies. The valves are checked for clearance and are ok and tight. Pushrods are in place. The decompressionlever works correct. I attached a picture with the smoke leakdown detection

Hi, i have a Generator with ah 186f Yanmar Diesel Clone with 9 workinghours. After two hours it stopped working and wont start again. There is a light grey/white smoke while cranking it up with the electric starter but it wont start, also the decompressionlever does not help. Diesel direct to...