Gearbox bolts... Any thoughts?!

[shouldhaveboughtahouse]

Hi all, so I'm at the stage of disconnecting my md7a gearbox. Does anyone have any idea what these mounting bolts are or how to remove them? They've obviously been in place for years but I can't make out if they are bolts or need something like an Allen key or something as-yet unidentified to get them off.
Any help much appreciated, I'm 4 bolts away from liberating the gearbox!
Many thanks in advance

 

[Boathook]

Looks like an Hex key or possibly a torx one. Be worth spending time cleaning it well to see the inside of it.

 

[RunAgroundHard]

It looks like a cap head socket screw. It looks rounded off either due to misuse or corrosion. There are extractor sets for this type of head.

Extractor Set

 

[shouldhaveboughtahouse]

Looks like an Hex key or possibly a torx one. Be worth spending time cleaning it well to see the inside of it.

Thank you, it's due a wire brushing I think!

 

[shouldhaveboughtahouse]

It looks like a cap head socket screw. It looks rounded off either due to misuse or corrosion. There are extractor sets for this type of head.

Extractor Set

Ah fantastic thank you, I'll pick one of these up. Sadly the pictured head is the best one, the others are severely corroded

 

[VicS]

Hi all, so I'm at the stage of disconnecting my md7a gearbox. Does anyone have any idea what these mounting bolts are or how to remove them? They've obviously been in place for years but I can't make out if they are bolts or need something like an Allen key or something as-yet unidentified to get them off.
Any help much appreciated, I'm 4 bolts away from liberating the gearbox!
Many thanks in advance

They are described as "Hex socket screws" in the parts list

 

[shouldhaveboughtahouse]

They are described as "Hex socket screws" in the parts list

View attachment 208480

Oh nice, do you mind if I ask where you found the parts diagram? I have the one from Volvo but this one looks a bit simpler and easier to see the external fittings

 

[Boater Sam]

Diagram says hex socket screws so an Allen key but you need to do some serious de-rusting and get lots of penetrating oil on for several days before trying to undo them.