Exhaust was blown - thats off having a stainless build done.
Same trip the rear main oil seal cried enough and it dumped 500ml of engine oil into the bilges over about 3 hours, so its gearbag off, flywheel off, bearing seal carrier plate off, new $20 seal, assembly is the reverse of the above.
While out its got new internal anodes, a few new water hoses, new fuel lines, water pump checked (relatively new impeller in it anyway), oil and filter change, and if I have time it will get a coat of hammerite or something similar.
Also bunging a lifting diode into the alternator to prop