www.iFourWinns.com

Hi Guys

Had a few hours to start planning my heater and shower install, and I need some advise on the best place to tap off for cold water.

The diagram in the link below is the exact thermostat housing I have. Does anyone know if there is cold water at either of the places marked "2". I am hoping these points will have a positive pressure so I don't have to use one way valves in the system to prevent crossflow. Even better if anyone has a flow diagram of the internal channels of this thermostat housing.

http://www.marineengine.com/parts/mercr ... ated-drain

If not then I will l cut the raw water inlet hose and use a T-Piece.

Hot water is easy... Outlet from a plug in the head which is under higher pressure, & run a T piece for heater and shower. Return from the heater is into the top of the recirculating pump which should have a suction.

Thanks in advance!!

_________________
Cheers

Mark
Melbourne
Australia

Boats:
Current: 2004 FW 190
2001 Mastercraft X5
1998 Malibu Response
1999 Sea Ray 180
17 ft Scimitar Barefoot (200hp Yamaha)
16ft Scimitar Ski (Yamaha 115)
1988 Ski Nautique ( Called Ski Antique)

I don't know that thermostat housing, but if you "T" into the hose between the raw water pump and the thermostat housing, you will have positive pressure cold water. But Lou can tell you how fast your bilge will fill up if that connection comes undone.

_________________

"Knot Easy" 2000 Horizon 240 Volvo 5.7GS /SX
tow: 2017 Honda PILOT EXL-AWD
prev. boats:
'87 Chaparral 198CXL 4.3 OMC Cobra
'69 Jetstar 16ft Ski Boat, 115hp Yamaha
'68 Aluminum Jon Boat, 3hp Sears
'64 Water Wings

Faster than you can say Oh SH!t....double clamp if possible ...

_________________
88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

Yep! Been there done that!!! Then you are stuck on the lake with an overheated motor and a boat full of water.

Hence the reason for wanting a better cold water connection point.

_________________
Cheers

Mark
Melbourne
Australia

Boats:
Current: 2004 FW 190
2001 Mastercraft X5
1998 Malibu Response
1999 Sea Ray 180
17 ft Scimitar Barefoot (200hp Yamaha)
16ft Scimitar Ski (Yamaha 115)
1988 Ski Nautique ( Called Ski Antique)

Not even Dr Google was able to supply me with a flow diagram so I pulled the thermostat housing off and had a good look.

It seems there is no suitable point to pull off cold water that will always be cold from any of the points so the only other option is a metal T-Piece to use in the cold water supply line. Not ideal but easily done.

And yes LouC it will be double clamped... Experience has taught me well!!

_________________
Cheers

Mark
Melbourne
Australia

Boats:
Current: 2004 FW 190
2001 Mastercraft X5
1998 Malibu Response
1999 Sea Ray 180
17 ft Scimitar Barefoot (200hp Yamaha)
16ft Scimitar Ski (Yamaha 115)
1988 Ski Nautique ( Called Ski Antique)