If the engine will not turn over well when hot and restart. Some wd 40 sprayed down the intake throat with the air breather cover off might be worth trying.


There is a chance if it will not light off this way the engine is partially bound up. You mentioned a squeeling noise at one point in your descriptions that was not identified.


Part of your description looks like it may be binding up a little more as it warms up. With the glow plugs out the engine should turn fairly freely.


This post is just an item that cannot totally be overlooked unfortunately. Not a certainty it is the problem.


Hot it would not crank well but more like a very weak battery. Yet cold the next morning it would crank normally. This is not normal. Also this clang noise you hear might be related to a bearing failure or something else mechanical.


As an example if you ever get a clang on engine shutdown. More times than not you have a broken crank. These engines fortunately have a robust crankshaft and seldom break. At the same time bearing issues are known.