Winterizing Merc 4.3 TKS

SeaReagan

New Member
Jun 26, 2020
11
Boat Info
2009 Sea Ray Sport 185 with 4.3 TKS
Engines
Mercruiser 4.3 TKS
Hey All,
I have owned my 2009 185 Sport for several years now. I've always winterized by pouring RV antifreeze through the hoses at the T-stat. I have the 6 port thermostat housing. Everyone has always recommended pouring AF into all of the hoses. I'm questioning whether that is really necessary. Shouldn't both the riser AND manifold fill when AF is poured through the riser hose? Last year I tried pouring it though the riser first expecting to see it come out of the manifold drain but, if I remember correctly, it ended up coming out of the exhaust instead. Thanks!
 
Nevermind. The riser hose will fill the risers and the manifold. There seems to be no reason to fill ALL the hoses.
 
The main reason to pour in all hoses would be to force out any trapped water.
 

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