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Old 10-30-2013, 09:20 AM
cruiser cruiser is offline
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Join Date: May 2013
Boat: 1981 mastercraft S & S 351W PowerSlot
Location: Mid-Michigan
Posts: 518
Question 351 winterize

Drained the water, exhaust risers, both sides of block, elbow below water pump, removed water pump after pumping 5 gallons of red rv. Talked to a friend, he said are you sure the thermostat opened? The temp guage never reads more than 120 degrees. So now i'm not sure. Went to where i store the boat, uncovered it, checked all the drains and red pop came out all 4 drains. Why can't we just winterize and forget? Always have that doubt. Do you guys feel the same?
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Old 10-30-2013, 03:39 PM
east tx skier's Avatar
east tx skier east tx skier is offline
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Join Date: Jul 2004
Boat: 1998 Ski Nautique
Location: End of my rope.
Posts: 26,183
Your PCM 351 engine has a bypass on the tstat. Once you drain, you can fill the block, etc. by pouring RV antifreeze through a hose straight into the tstat housing. Doesn't matter if the engine is warm.
Previous: 1993 Prostar 205

Red 1998 Ski Nautique, PCM GT40, 310 hp, , Acme 4 blade, Perfect Pass SG/Zbox.


Be kind. Have fun.
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