After removing all the old internals and cleaning up the inside of the pump housing with turps and a rag l was all set to put it back together.
In went the oil seal wetted with water, dead simple. Did leave it a fraction proud on the bearing side to ensure a good seal. Hope it's not to proud and chews out straight away.
In goes the bearing, dead simple. I used the Yammy bearing as it only cost $13 and so was not worth going to the bearing shop for a better/cheaper one.The old bearing was fine.
Now the fun bit. The machanical seal.
This is the old one on the right and new one on the left.

Getting the old one out was a pig of a job. It's got some very good loctite on it. It took a big hammer a punch and a socket to bash the thing out. About 15 mins of belting the crap out of it.
Here it is in two pieces. You can see the marks all around it where it got belted.


The new mechanical seal went in ok. Had to find the exact right size socket and just tapped it around and around until the lip was sitting flush inside the housing.

Ready to fit the mech seal.


Put it all back together and no leaks...... yet
Will take it for a spin in the morn to test out.
All up was a fairly easy job if you know how to treat mechanical seals.
Will definitely be doing more regular oil changes. I know what the strange noises were caused by, lack of oil. Hope it's not to bad in there.