Ken,Interesting diagrams, but confusing.
Note that this diagram:
View attachment 51402 and this diagram: View attachment 51404
are different. I think both are a bit misleading.
The first one shows both the exhaust manifold AND the accumulation tank (what I had been calling the expansion tank) venting to the (plastic) overflow tank. While this makes sense, I don't believe the accumulation tank Ericson used was fitted with such an overflow vent (I know mine wasn't). So, in most setups, only the engine exhaust manifold vents to the overflow tank, unlike what the diagram shows.
The second photo confusingly calls the (plastic) overflow tank the expansion tank (not to be confused with the accumulation tank). And oddly, this diagram labeled "Water Heater Hook Up...." omits the accumulation tank altogether. Confusing!
Remember, the (plastic) overflow tank is always un-pressurized. The top cap has a hole in it that vents the tank to atmosphere. This allows the tank to fill and empty itself of coolant that escapes from the pressurized caps of the manifold (and/or the accumulation tank).
The accumulation tank, like the manifold, is pressurized once the coolant heats up, and thus, requires a sealed, pressurized cap (like a radiator cap on your car).
Ok, good to know. Does the exhaust/coolant manifold vent to the overflow as well, or just the accumulation tank?Ken,
The metal accumulation/expansion tank on our E30+ does have an overflow vent hose to the plastic tank.
Frank
Interesting diagrams, but confusing.
Note that this diagram:
View attachment 51402 and this diagram: View attachment 51404
are different. I think both are a bit misleading.
The first one shows both the exhaust manifold AND the accumulation tank (what I had been calling the expansion tank) venting to the (plastic) overflow tank. While this makes sense, I don't believe the accumulation tank Ericson used was fitted with such an overflow vent (I know mine wasn't). So, in most setups, only the engine exhaust manifold vents to the overflow tank, unlike what the diagram shows.
The second photo confusingly calls the (plastic) overflow tank the expansion tank (not to be confused with the accumulation tank). And oddly, this diagram labeled "Water Heater Hook Up...." omits the accumulation tank altogether. Confusing!
Remember, the (plastic) overflow tank is always un-pressurized. The top cap has a hole in it that vents the tank to atmosphere. This allows the tank to fill and empty itself of coolant that escapes from the pressurized caps of the manifold (and/or the accumulation tank).
The accumulation tank, like the manifold, is pressurized once the coolant heats up, and thus, requires a sealed, pressurized cap (like a radiator cap on your car).
The water lift muffler pushes the mixture of hot water and exhaust gases uphill from a point below the engine, thru a higher loop of hose, and downward to the transom exit fitting.Is "lift can" what I've been calling a muffler? What does it lift?
Just the accumulator tank.Ok, good to know. Does the exhaust/coolant manifold vent to the overflow as well, or just the accumulation tank?
Thanks Ken. We definitely don't have a tank like that. And our plastic overflow tank has the two outlets molded in but one was never cut open. Based on that it's probably safe to say our boat never had the expansion tank. I'm tempted to think they're kind of like an appendix, though Loren's observations on the 'T' could offer reasoning for why some boats have them. Further down the rabbit hole.My apologies, guys. I was talking from memory only about a system I last worked on in 2017, and I got some of it wrong....
The stock Ericson accumulation tank does have an overflow hose that vents to the (plastic) overflow tank. In my setup (Universal M25), the exhaust/coolant manifold also has an overflow hose to the (plastic) overflow tank. That makes this diagram correct for my boat:
View attachment 51412
Here's the accumulation tank:
View attachment 51416
And here's the overflow tank with two ports on the bottom:
View attachment 51417 View attachment 51421
Maybe one of the keys to understanding the accumulation tank setup is this: The pressure cap on my accumulation tank is 7lbs, while the cap on the manifold is 14 lbs. So, under normal circumstances, the accumulation tank will always be the one venting to the overflow tank. The overflow vent on the manifold, then, is redundant, except in cases where the engine doesn't have a water heater with an accumulation tank installed
View attachment 51420 View attachment 51423
Exhaust Riser to Muffler, E35-3
Leak in hose connecting exhaust riser to muffler. Universal M-25 in 1986 Ericson 35-3.youtube.com
You're right Christian, the hose is shot. Shame on me for not catching it sooner. We did have a mechanic remount the engine in July of 2022 and replace the manifold/riser pipe in September of that year. They didn't call out this hose then, though it must have been in rough shape. Sigh. But could this account for the loss of coolant or it getting diluted?
View attachment 51364 View attachment 51365
You've got me curious about the staining from the exhaust. I'm going to track down some older photos of that area to see how the current state compares to previous years.
Good catch! Now that you point it out, it's obvious. But it totally slipped by me. The nipple on the muffler is kind of short so that's what happened there, too. One mystery solved. Thanks, Christian.It does look like the second hose clamp on several hoses was tightened outside the stub. That would certainly ruin a hose. Both clamps are supposed to be on the stub.
View attachment 51436