Hi Andy,
Front cover comes of easy enough, you will need a 1 1/2" socket or ring spanner to undo the crankshaft bolt, they normally come undone easy enough, I have a electric impact wrench at work and that wizzed it out. Alternator out of the way, fan and mounting off, row of bolts each side, two nuts and bolts at the top ( between the cylinder head and front cover )a couple of sump bolts ( already removed in your case ) and gently ease it off and there you have it !
Interesting enough the cover is located by two dowels similar to that in your picture, but the only way one could fall out was when the engine was built ! Or a 'spare one ' [:0] Always remember this was built by BL so anything possible !!
Cheers John


LIVE LIFE A QUARTER OF A MILE AT A TIME!
1976 Speke FHC BEAUTY FITTED WITH OVERDRIVE GEARBOX
1979 3.5 FHC CURRENTLY GARDEN ART !
1982 2.0 DHC NOW A 4.6, BUILT NOT BROUGHT !!!!