they are immediately behind the engine. Perhaps that is a exhaust and there is a blower somewhere and one is a fresh air intake?
can someone tell me what these two hoses/ducts are for?
- Thread starter Ted10028
- Start date
Those two ducts look like they’re for airflow, possibly with a blower. With a diesel engine that’s primarily to make sure the diesel has enough air to consume, and to help exhaust some heat.
Separate from the ducts I’m quite concerned about the through hull below the prop shaft. That looks like it’s just a plastic nipple screwed into the hull, with no valve at all? Definitely doesn’t look like a proper seacock. If that hose fails as far as I can tell there’s no way to stop the water ingress.
Separate from the ducts I’m quite concerned about the through hull below the prop shaft. That looks like it’s just a plastic nipple screwed into the hull, with no valve at all? Definitely doesn’t look like a proper seacock. If that hose fails as far as I can tell there’s no way to stop the water ingress.
thanks, it's a Catalina 320. Someone Has to recognize those ducts. I am too old and too claustrophobic to get down there much more and try to figure out where they go. One of them seems to go out the back of the boat. noticed yesterday that the hose was cracked badly where it makes a right angle just as it exits the boat out the transit through a chrome scoop.
it's a 2004 Catalina 320 with original through hulls. I guess it's bad lighting that prevent you from seeing the handles.
Handle or not, it looks like plastic. A Groco ball valve, while not a proper seacock, costs around $50. Even that would be better than plastic. Don't underestimate the amount of water that will come in if something breaks
catalina might be biggest maker in world??also when winterizing in fall only through hull that gave me trouble was after market brass that last owner put in for heatpump.
Was it lubricated every year? My original, 46yo, had no issues with the ball/handle turning. It appears as if the ball only touched plastic and no metal. I replaced it because I saw pitting in the finish which may compromise the seal
Ventilation for the engine compartment AKA "bilge blower" on the port side of transom there is an exhaust fan connected to one while the other is a passive intake. There is a switch on the underside of engine instrument pod to turn on/off it is connected to the key switch. If you turn key on, with engine off you will hear the fan if it is functional and switch is on. Even with engine running it is usually the loudest thing you hear.
Note switch labeled "blower" on photo.
Note switch labeled "blower" on photo.
And that is a Forespar Marlon thru hull used on most Catalina's since 1992, that's a LOT of boats.
they have a little pin with a donut on the end. Does anybody know what they are for?
Thanks. I feel better about the picture now. It wasn’t the plastic I had a problem with, it was the overall look and lack of a visible handle. Glad it was just the lighting and angle, and not really as bad as it looked.
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 23,146
While this might be a true statement, the design of your thruhull/ball valve/hose is not the design intended by the manufacture Forespar, of your marelon ball valve.
Here is the intended design with a hose that is either straight to the ball valve fitting or at a less than 45º angle.
Marelon recommends the use of an "Elbow" when the hose to valve connection exceeds 45º. This is to reduce the strain a bent hose that can be moved about while in use from breaking off the straight tailpiece of your valve.
Now one of the challenges is a 90º tailpiece will cause some reduction in flow. If that is a critical issue in your installation look for a Full Flow 90º elbow. (I know groco makes them for their "Bronze" valves). I do not think Marelon makes a "Full Flow elbow. So clever sailors increase the diameter of the valve/elbow to get the desired flow.
Just an observation - the OP was asking about the unknown hoses - now we are fixing his thru-hull... Perhaps a different thread might be in order? There is some great info here but if anyone wanted to find it in the future, might be quite hard to find... Just a thought...
dj
dj
Yeah, you don't want to futz with that, it's a cap that reveals a screw head that holds the handle on that doubles as a plug when inserted from outside. Don't futz with it while in the water, here's a vid that came up in a You tube search.
It's not good practice to put supply and exhaust beside each other. Airflow just follows the shortest path and accomplishes nothing
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 23,146
I agree but certainly catalina knew what it was doing so those two hoses must be for something else. did you see the picture of them? I will attach it againIt's not good practice to put supply and exhaust beside each other. Airflow just follows the shortest path and accomplishes nothing
