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Got a big boat and new to all this, need help figuring out what this tank leading to engine is for

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Olle5

New member
Hello, hope you guys can help me because I can't find much information
I'm confused by this tank, you can fill it on top of the boat similar to how you'd fill fuel, the yellowing clear hose leads out to a small hole where I assume whatever fluid could go out, the big black hose says oil resistant on it, it leads to the engine, I checked inside the hose and there seemed to be water but it could have been rain water that leaked into the tank.

I don't see what the tank is for, there is a pump to bring in seawater in the bottom for cooling., so what purpose could this tank have? Contain oil? But I thought I'd fill that in the engine block. Hmm I dont know

Also does anyone know what engine model it is? The owner or people I bought the boat from have said "volvo d96" and "Volvo penta 175hp" but I can't really find one that looks exactly the same online yet.

Volvo penta
https://imgur.com/gallery/xc8HXmi

Thanks for any help would appreciate it
 
It appears to be a overflow tank for engine coolant. It probably has a closed cooling system on it. The way to top up the coolant was thru the deck fill. The clear hose was a "sight glass" to let you know how full the tank was. The seawater inlet is supposed to go to the heat exchanger and then out through the exhaust. The coolant is your regular old Prestone and is in the engine and heat exchanger only. Looking at those pictures, I'd say that you will want to replace all that old plumbing.
 
Interesting thanks, do you think it's possible that someone (or is it commonplace) has used water instead of the coolant you mentioned? Jeez don't think I could replace all the pipes, hopefully it'll work a while before that, what happens if rust gets on the colling system? How sure are you that it's an overflow tank for coolant?
 
It'll work until it doesn't ha ha ha. 10/10 it's a coolant reservoir.
Some previous owner has used hardware store plumbing pipes. These are not what you wanna see on a boat. The hoses appear to be stuck onto the threaded end of the nipple and held in place with a single hose clamp (cringe). Not good. Not only is it a super weak connection, it can easily blow off.
 
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Very nice thank you a lot, I found some glycol so it makes sense, I remember wondering what that could be for and then forgot about it until you mentioned it.
 
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