Update: I lifted the engine and gearbox out of the 1850HL today and split the box from the engine. When I removed the clutch the crankshaft pilot bush just fell out as took off the clutch assembly. It seems a loose fit in the crankshaft. Is this a common problem?
I see that the front pulley is held on with a bolt that measures 1.5 inch across the flats. Needless to say I have no socket anywhere near that big! Old cars, don't you love 'em.
I've had a few spigot bearings fall out like that, a new one will cure it, they are not expensive or hard to get.
Not only is the crankshaft dog nut 1.5" big, it will be flippin' tight too! Before now, I have advised people with problems undoing it, to take the engine to a local independent tyre shop (NOT thicktwit) to be undone with their 1" drive truck airgun. I DO have a 1.5" socket, but only a 1/2" drive airgun which is often not man enough! When the engine is still in the car, I use a big knuckle bar and the starter motor to undo them, once the engine is out, its a bit more difficult!