merry tiller chain case

Hi , I think the oil in my recently purchased Centaur chaincase is too thin ( it leaks when stood cold ) so I want to drain and refill it with some SAE40. How do I drain the chaincase ?
                  regards Mick

It is usually the rotor shaft oil seals that leak, they are a problem on Merry Tillers. I sell them, but have to get them made now as original stocks are exhausted, though you can also get US spec seals, which are a single lip seal of half the width, you put two of these in each side back to back. Regarding oil, Wolseley recommended SAE40 but the US makers now specify 00 grade grease, which is oil with the viscosity of cold treacle.

There's no oil showing on or around the rotor shafts, its just at the bottom of the chaincase .I don't fancy draining the engine fluids, how easy is it to remove the engine and then lay it on its side ? And does anyone have a cheap UK source for the oo grease ?
                                            regards Mick
                           

Can't get the oo grease in less than 12 kilo drums so I'm settling for a litre of sae40 for the chaincase from Pennine Lubricants .Got the engine off so I got in there with some gunk and now it seems a shame to dirty it up, might dig  by hand and just polish the tiller.

          Regards Mick

                 

Screaming eagle chain guard from yuor local harley davidson dealer. It comes in an arosol. Same viscosity but a tad expensive