I have a JM354 3cylinder Jaingdong which leaks oil from either the rear main bearing or the rear of the oil pan. I can’t tell which, as it is a close fit. I will have to remove the front drive line and drop the oil pan to get a better look. However, the odd thing is that it doesn’t leak when the engine is running at 16-1700RPM. at 1200RPM or less it leaks. At idle it leaks badly.
Does anyone have an idea as to the cause?