Cleaning a stationary engine

Hi guys,

My neighbour has a Stuart (5A?) stationary engine, powering a launch. He recently took advantage of the lockdown to remove said engine and have a look at it. Long story short, he thought there was play in the bottom end of the crankshaft and thought it might need a new bushing. Enter stage left, me with a lathe. Having had a look at it, I am not sure as to whether the play is bad enough to warrent any machining. I am sure the whole thing could benefit from a clean up though! We have come to a tentative agreement that I will clean it up in exchange for some money (lockdown has not been kind to me!).

I am confident I can strip, clean and put back together in the right order, but I want to know if there are any surprises likely to be waiting for me which will make the job much longer than I expect? I have already guessed that the cylinder lagging might be asbestos related so I am not going to disturb that! Should I expect to be replacing piston rings? Will there be strange and hard to find sealing elements in the pump attached to it?

Basically, I want to be able to give my neighbour a price that is fair to him and to me so we all end up happy and I can go for a ride in his launch when we all recover from the pandemic!

P.s., Please excuse the horrible state of the workbench, the engine has been put on the 'I don't know where to put it just yet' area!