I would try and fire it up rather than take it to bits as you won't do any more damage than already in there (if any). The difficulty to turn it over by hand that becomes easier if left for a bit could simply be good cylinder compression which on an oil burner will be quite high thus difficult to turn by hand. As the compression leaks past the valves and piston rings (given a little time) it will become easier to turn until the next piston starts to build up pressure where the cycle repeats itself 2,5 times per revolution of the engine - Mike
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