Hey all. I have a VP280. I was replacing a piece of old hose (3/4” or so that runs off the YPipe and splits off to each riser) and found what looks like a reduced in it (see attached pic). Is that supposed to be there?
It’s a 5.7 block from a Chevy truck that was marinized. I don’t know much more about it. The outdrive is a 280 but the Y-Pipe I bought used from someone.
I need to look up the cooling system in order to see how it was manufactured.
Your saying riser so I betting your talking about the elbow that sits on top the exhaust manifold. The riser, if you do have one, it sits in between the manifold and the elbow.
If your motor has hoses connected to the manifold and more hoses connected to the elbow/riser then it could be made that way. You want more water going to mans the elbows
I can take a better pic tomorrow…but this one shows 3/4” lines I’m talking about. Where they meet (that little red T fitting) they combine into one line which runs into (or from) the Y-Pipe. It was in that combined line I found this little reducer
Geezers, don't know who put that together, but never seen anything like it.
Don't know what the hose that goes from the top of one Man to the other is even should do. It's not closed cooled, so those hose have no effect. My initial thought is remove and plug the Mans where hoses where attached, not needed.
Water flow should go in bottom of Mans and out the elbows
Sorry just to clarify some of the language and names of parts: water flow goes from pump to the manifolds and then the risers are above the manifolds? Then from risers to elbows and out the y-pipe? For what it’s worth I attached another pic that shows how it all attached to the y-pipe. If that stub in the YPipe isn’t for these 3/4” lines then what is it for? If I wanted to put it back to stock I should just cap them both off at the manifold and also cap off this stub on the YPipe?
i'm a little confused by that parts diagram. It makes it look like only one riser has a line plumbed into the thermostat housing? Or maybe it's drawn in a way that you can't see that the second riser is also plumbed into it (see attached pic)? I'm assuming my boat is correct in that both exhaust pipes are plumbed to the t-stat housing?
These drawings make no reference of lines plumbed from the exhaust pipes back to the Y-Pipe (as is the situation with my boat). I wonder what the ports on my exhaust pipes are even for then (see attached pic)? And what is that extra port on the Y-Pipe supposed to go to?
In any event, I guess it seems like the best advice from folks on this forums is for me to just cap off these two lines from the exhaust pipes and also cap off where it stubs out on the Y-Pipe?
The thermostat housing has 2 1" outlets, the big lower hose connection, and the 1-1/4" inlet from the raw water pump . One outlet should go to each manifold. The manifold exits thru the elbow to the y-pipe.
