Looking at the engine internals, my first observation is that the undersides of the pistons are shiny. Is this the answer to why the piston tops were clean compared to the head. I’m strongly of the opinion that the pistons have therefore been replaced.
With the sump off I can remove the main bearing carriers. Inspecting the bearings shows some but not excessive wear and that they are of standard size see below. The only problem I have is that I didn't think to remove the front fan belt pulley before removing the engine. My fear being that I won't be able to undo the pulley securing bolt/nut now the engine is out off the tractor. If this is the case I can't remove the pulley and timing belt cover which in turn means I can't take out the crank.
If this is the case I will have to replace the bearings in-situ. Whilst this can be done its not ideal.
On a different note, despite the cold weather I've started to notice that the lighter evenings are coming. Perhaps the first signs of spring. In the back of my mind I'm conscious that I need to start the process of re assembly some time. At the moment all I seam to be doing is dis-ssembly. Lots still to do.
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