Groco flush kit.

[jason78]

I love this in concept. Unfortunately, my motor pulls water through a seacock AND through the Bravo III. I guess I could install this, but still need to put muffs on the B3 and hook up both to antifreeze for winterizing?

? Are you sure ? I have not seen that configuration before. Normally it is one or the other. So you have a "t-piece" on your waterpump intake? My B3 water intake is not used at all - everything runs through the seacock. (2008 MAG350 B3)

Both my engines are set up this way as well from the factory. I was told (by a Merc Tech as I recall) that for the Small Blocks with factory Fresh Water (Closed) Cooling, the Water Intake through the Bravo 3 alone does not provide adequate RAW water supply to the cooling system and this is why a Seacock is added in to supplement. There is a Y-Fitting just behind each RAW water pump where the two intake hoses converge. I was confused by this at first because I had 2 extra Seacocks that others did not have. I then found out the reason was the boat was Factory Optioned with the Fresh Water Cooling System.

I have considered blocking off the intake from the outdrives all together because I am fairly certain it would be OK to do. Won't mess with that until I have to pull the engines for some reason though. Supposedly there is some sort of block off plate to can install in the Transom Assembly to block that hose. Have not looked in to it though. Kaz, I suspect the reason yours is solely run off the seacock is that somewhere along the way, Sea Ray figured out they should simply block off the Outdrive intake for simplicity since it is not needed.

[kaz911]

Both my engines are set up this way as well from the factory. I was told (by a Merc Tech as I recall) that for the Small Blocks with factory Fresh Water (Closed) Cooling, the Water Intake through the Bravo 3 alone does not provide adequate RAW water supply to the cooling system and this is why a Seacock is added in to supplement. There is a Y-Fitting just behind each RAW water pump where the two intake hoses converge. I was confused by this at first because I had 2 extra Seacocks that others did not have. I then found out the reason was the boat was Factory Optioned with the Fresh Water Cooling System.

I have considered blocking off the intake from the outdrives all together because I am fairly certain it would be OK to do. Won't mess with that until I have to pull the engines for some reason though. Supposedly there is some sort of block off plate to can install in the Transom Assembly to block that hose. Have not looked in to it though. Kaz, I suspect the reason yours is solely run off the seacock is that somewhere along the way, Sea Ray figured out they should simply block off the Outdrive intake for simplicity since it is not needed.

Since it is a 2005 5.0MPI - it is the Horizon version? Do you have a fresh water flush port on the starboard riser? Or is 2005 just a year to early for that?

Anyway - you can install a "breaker" between the Y- fitting and the pump - and then add the Groco flush port there. Or add a shut-off valve on the hose coming from the B3 going into the pump - and then install the Groco flush port on the Seacock.

[Havana Shamrock]

Gary, are you using them for the mains or just A/Cs and genny?

Alex, I know guys that have them on both mains,the genny, and a/c strainers this is what i plan to do so I can flush and winterize all intakes easily.