Hi Paddlers, after reading your message I set straight to taking off the gearbox.
Had a nosey around at the gear rod linkage and figured how to release it, it's a plastic clip with a pin on one end ( which secures the rod ) and a sort of half circle slot in the other to lock / unlock it into place.
The gearbox bolts came loose easily, can see the remains of copper grease on the threads. The gearbox came free very easily, no resistance at all.
I've attached photos, rather than try to explain parts etc.
First thought was it is normal to be this manky inside ?, and should there be a gasket on the gearbox where it joins the leg ?
I then noticed the small rubber section ( duno what it's called ) that mates with the impeller housing, should this piece be inside, under the housing to seal properly ? I'm thinking that is maybe why its so manky and would also explain why no water is being pumped ?
The vanes on the impeller actually look ok through the hole on top, but I will change in anyway.
If anyone recognises the model and year please let me know, so I can order new parts !
Just had a Google at decals and colours, but can't find exact years, some of the photos are just too vague to compare against but I'll keep searching.
Thanks Paddlers !