Thanks Flusher
Yes as you've teached me , I will keep 5mm of play
Unfortunatly when I've first installed the engine to determine the bell adapter lenght , I didn't noticed that the Ujoint adapter was not sat properly tight on the flywheel , I had to mill the midle so the crank protrude into it
Now the adapter is too long but I can mill it -10mm on the bell side
Yes concentric Ujoint/ pump shaft , this would be an issue I guess
i've drawn the adapter using the center hole in the bell as a base , assuming it was the center of the crank / gearbox
Looks like I'm not far , I can rotate the engine by hand (no sparkplugs !) seems very smooth from damper to impeller , even put a bit of starter on so this lived for the first time ever !! Electricaly ok ...
I will set the engine mounts so the bell adapter sit well flat on the pump
Solid motor mounts Ok , well this is bolted on a wood stringer so there is the vibes absorbtion
Other thing is I wanted to dismantle the end bowl of the pump to check the bearing & seals
Ex owner told me the pump was rebuilt , impeler looks new , but as It is accessible right now , a bit of look won't hurt
I“ve unbolt all the screws all around but how do you pull out the bowl , it is so hard to move !
Thanks again