1978 OMC Winterizing

[StarCraft78SS]

Hello all,

I have a 1978 StarCraft 18 foot inboard with a OMC engine. Just wondering what you guys all do to winterize. I have poured RV antifreeze good to -50 down 3 hoses on top of the engine. Had good red coming out of the two drain petcocks, out the impeller holes down by the prop, and on the big hose it came pouring back around again. Just wondering if I have missed anything. We just got the boat this summer and we fully rebuilt the engine due to seized wrist pins since parts weren't hard to find and I don't want my inexperience to ruin it.

Thank you!

 

[StarCraft78SS]

Attached photos for reference of the engine. Thanks!

 

[Scott Danforth]

change engine oil and filter
drain everything
poke drain petcocks to make sure everything is clear

block is now winterized

pouring AF down the holes is fine

change the oil in all 4 gear boxes (intermediate, upper, lower, and tilt)
pull the drive and store in-doors. change the impeller every few years