Question concerning the single point drain system

**KP49** · 11-02-2012, 09:52 AM

On my 2007 350 mag one of the hose fittings on the block was blocked. Merc put quick disconnect fittings on the block drain hoses for a reason I guess. I'm pretty happy I happened to do do a search on the single point system and on another forum there was a lot of discussion about it and to make sure and check the manifold check valves and block drains to make sure they are open.

If I didnt check those block drain hoses I could have had a bad spring. Of course if you are doing the through the drive running antifreeze thing it wouldnt matter..

**Last Dollar** · 11-02-2012, 03:54 PM

Good to know information. Thanks for sharing.

**Last Dollar** · 11-07-2012, 07:19 AM

Winterized yesterday and it took 4 gallon of the pink stuff poured down the block by removing the thermostat and filling the hoses going to the thermostat. I would say the block was dry when I started.

I ran it up to temperature before draining and felt the hoses going to the single point maniford device, they were luke warm. I'm not sure there would be a whole lot of flow in them during normal operation. I did notice some very slight discoloration and apparently rust particles when I first opened the valve but it was very slight and only lasted for a few seconds. Water poured into the bilge for quite a while. This is my first winterization on this boat and I don't want any surprises next spring. Hope Mercury Marine has engineered this thing well.

**Lazy Daze** · 11-07-2012, 07:46 AM

What drive do you have - Bravo or Alpha?

**Last Dollar** · 11-07-2012, 09:06 AM

I have the Alpha Drive

**Lazy Daze** · 11-07-2012, 10:16 AM

You're good to go.

Oh... you have the spin-on fuel/water separator, right?

**tcason** · 11-07-2012, 11:23 AM

[QUOTE=Last Dollar;625554] This is my first winterization on this boat and I don't want any surprises next spring.

You may want to also pour a gallon of anti-freeze in the bilge. I cannot get all the water out of my bilge and one year I believe the bilge pump was in the "pure" water froze and cracked.