Quote:
Originally Posted by Dtodt223
Wow, in the new England winters? I do know this is a very hot debate. I didn't even think about draining or filling the lower unit. That should just be another hose off the t-stat right?
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So at least on my 4.3L right on top of the engine block right in front there are 4 cooling system hoses See pic below
Hose #1 goes to the water pump and block.
Hose #2 goes to the stern drive and backfills the impeller housing
Hoses #3 and #4 go to the risers.
I disconnect all of them and start backfilling #1 till it starts to come out the housing where it was connected (takes about 1.5 gallons). Reattach hose and move on to #2 fill that till it starts dumping out the intake on the stern drive (takes about another 1/2 to 3/4 gallon). Reattach and backfill #3 and #4. Split what is left between the two. Any extra will dump out the exhaust ports in the stern drive housing.
Again I leave the antifreeze in the engine as it supposedly has rust inhibitors.
In the spring roll the boat into the driveway put the muffs on and fire it up.