I winterized my closed loop system buy pulling the exit line out of the V drive system, shoving a funnel into it, and feeding antifreeze through it until it came out of the heat exchanger. I also pulled the exh manifold plugs, and blew out the V drives. (just hooked a shop vac up to the exit port, until nothing came out of the water inlet that is fed from the Perko strainer) I shoved an 1 1/4" hose into the perko strainer, with my hand cupped over the end, and forced most of the water out, and filled those with antifreeze as well.

My question is:

1) do I need to do anything else with the Walter V-drives to make sure that they're good for the winter?

and

2) given that Walter recommends pulling the top cap and inspecting seasonally, would it make more sense to do it now, and dump some antifreeze in the coolant passage, and leave it loose for the offseason?

It is my understanding that Walter recommends a new gasket at the top of the V-drive, but would a premium RTV work as well? Doesn't seem like it gets much pressure.