Richard
my standard but learning, is open bonnet yup an engine, i have just learnt to change oil and deisel, so if i explain thing as an idiot please understand I'm learning, i do feel in aw of people who get what looks unsalvagable then next looks brand new.
On the front of the engine is a 41 mm "nut" Jim says he can crank that for 4 turns then stops, he says it is compressiing, he has taken the. Top of the engine off and checked pistons and i think push rods and can't see a problem there, hence assumption of con rod, I'm on a drive and no cover.
Jim is a professional mechanic and i trust him
Richard