Still have the boat out on the mooring, trying to get a few more weekends of fishing in before I pull it and winterize.
1) Run the engine till warm, change oil and filter
2) run engine again, check for leaks at filter, if OK fog engine and shut down
3) let engine cool off
5) remove all drain plugs and poke openings, 2 on each engine block, one on each manifold. *Note, some late model 4.3s have a drain on the front edge of the intake manifold, mine does not but the newer (vortec) models do*
6) remove bottom end of big hose that goes to the front circulating pump that drains a lot of water
7) reconnect that bottom end.
if you want to use AF to {reduce corrosion only}
disconnect the top end of that hose at the thermo housing. Start filling the engine with the best -100 AF not the cheap -50 stuff, till a bit of AF comes out the drains, that pushes the last of the water out. Put OMC gasket sealer or similar on the threads of the drain plugs and re-install. Fill the engine till you see AF come out the thermostat housing neck. Re-attach that hose and the engine is done.
9) Fill the exhaust manifolds the same way, till the AF runs out the exhaust
10) Disconnect the raw water intake hose, point it down in the bilge to drain water (tilt bow down a bit)...fill it with AF till it comes out the drive water intakes. If you have a Bravo or Volvo, make sure to disconnect that hose and the one that goes from the impeller housing to the thermo housing and drain it. Mark these hoses so you don't re-connect them wrong.
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