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trainfan1 trainfan1 is offline
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First recorded activity by BoatBanter: Jul 2006
Posts: 194
Default winterizing mercruiser?

D&LBusch wrote:
Do I need to drain the block and hoses if I'm using one of those coolant
kits that attaches to the muffs on the outdrive? It would appear not.
since it is sucking in the Anti Freeze and will displace any water left in
the block. Thanks in advance. David



For my I/O & inboard customers, I drain everything, every petcock, and
then go w/ 100 percent anti-freeze at the water pump / muffs. There is
no way to get ALL the water out of all jackets/manifolds/block, so I get
some intermix, to less than 100 percent A/F, and run it until I get a
good A/F discharge at the exhaust.

Never a failure. Worst case scenario in -30F storage would be a little
"slush" in the engine, causing no damage.

Rob