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Go Back   SailNet Community > On Board > Gear & Maintenance > raw water intake
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Thread: raw water intake Reply to Thread
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Topic Review (Newest First)
06-26-2008 09:19 AM
SEMIJim
Quote:
Originally Posted by beej67 View Post
Where were you able to find pressure rated hose that's clear?
I assume this was addressed to me?

I don't know as it's pressure rated. That's unimportant in this application. All I'm talking about is a 3' length of temporary hose with a double-ended barb in one end that's used to suck RV anti-freeze out of a bucket as part of winterization prep.

Jim
06-26-2008 07:21 AM
rchad
raw water intake

I did get some very useful info from my local Yanmar dealer. He said that the rate of flow from my Yanmar 2GM20F should be 2 GPM at 700 to 11 GPM at 3300 RPM.

Thanks to all for suggestions..now back to solve the mystery
06-25-2008 03:01 PM
negrini Going a little back, Rchad, first look to the flow of a similar boat on your marina and visually compare, then you can take indirect measurement like your engine temperature under different revs/load, wich ultimately is what you want to be under control. Finally, put your hand on the discharge and that should be somehow "warm" not disconfortably hot, neither cool at all. Remember this is an integrated system where strainer, pump, exchanger, raiser, waterlock, mufflers, lenght of hoses, diameters, etc... should be matched. Best procedure, is to contact dealer or a local experient mechanic.
06-25-2008 01:37 PM
knothead
Quote:
Originally Posted by beej67 View Post
Yeesh. Be glad you could get the part at all. I think at that point I might have pulled the elbow and tried to figure out some way to clean it (pressure wash?) long enough to last me until I got back to the States.

Good story though, which is all that matters, right?

That was my point. I had the part on board. If that wonderful woman hadn't insisted that I buy it before I left, I would have been screwed. The old one had rusted completely through.
06-25-2008 01:20 PM
beej67 Yeesh. Be glad you could get the part at all. I think at that point I might have pulled the elbow and tried to figure out some way to clean it (pressure wash?) long enough to last me until I got back to the States.

Good story though, which is all that matters, right?
06-25-2008 12:39 PM
knothead
Quote:
Originally Posted by beej67 View Post
I got a hold of a guy from Sound Marine Diesel LLC through the Pearson mailing list, who coached me through replacing mine via phone/email. It was pretty easy, I thought. I got a mixing elbow, an exhaust riser, and the coupler in the mail. Bought a bronze hose barb to fit in the mixing elbow down the street. Put them all together with a vice and a pipe wrench in my garage. Sound Marine guy also sent some exhaust-friendly thread locking agent with the parts for free in a ziplock bag. The hardest thing about my installation is that my muffler is right near my exhaust elbow, so there's not a lot of pipe running between them, and that exhaust pipe is a major PITA to bend. Also need to take great pains to avoid cracking your muffler. Hate that.
It probably would have been a lot easier if I hadn't been anchored off a rather small town in Costa Rica.
I sure wouldn't have wanted to have had one sent to me there. The other cruisers were saying that it took six weeks or more to get things sent from the states and it wasn't cheap.
06-25-2008 12:15 PM
beej67
Quote:
It was a hot, dirty job and my whole engine compartment was cover in soot, but at least I was able to fix it.
I got a hold of a guy from Sound Marine Diesel LLC through the Pearson mailing list, who coached me through replacing mine via phone/email. It was pretty easy, I thought. I got a mixing elbow, an exhaust riser, and the coupler in the mail. Bought a bronze hose barb to fit in the mixing elbow down the street. Put them all together with a vice and a pipe wrench in my garage. Sound Marine guy also sent some exhaust-friendly thread locking agent with the parts for free in a ziplock bag. The hardest thing about my installation is that my muffler is right near my exhaust elbow, so there's not a lot of pipe running between them, and that exhaust pipe is a major PITA to bend. Also need to take great pains to avoid cracking your muffler. Hate that.
06-25-2008 11:26 AM
knothead
Quote:
Originally Posted by beej67 View Post

Problem 3: carbon buildup in the mixing elbow. Didn't know this until recently, but mixing elbows are supposed to be replaced as part of routine maintenance, after about 8 years +/- of service life. Ours was right around that 8 year mark, and had undergone some corrosion, and a fair amount of carbon buildup where the raw water interfaces with the exhaust. Replacing the mixing elbow with a new part fixed the problem.

There was a very knowledgeable lady at the Yanmar dealership in Oakland years ago where we went to purchase spares for the boat before leaving the country. She insisted that we purchase a mixing elbow. It wasn't even on my list.
Listening to her proved to be one of the smart things I did in preparing for that trip.
It was a hot, dirty job and my whole engine compartment was cover in soot, but at least I was able to fix it.


Quote:
Originally Posted by beej67 View Post
If I had a flow problem when heeling to one direction but not the other, the first thing I'd look at is how far you were healing, and what side of the boat your raw water intake is on.

That's exactly what I checked out first. There was no way the intake was out of the water. Though it may have gulped some air. It was pretty bouncy.
The thing is, after bypassing the strainer, the problem went away.
I have a new engine and the same strainer now but the hoses are led differently. I haven't experienced a recurrence of the problem yet, but I really haven't been it that rough of a situation with the new engine yet.
06-25-2008 11:23 AM
beej67 Where were you able to find pressure rated hose that's clear?
06-25-2008 11:20 AM
SEMIJim One would think air in the fresh water intake should go away pretty quickly.

I've a length of clear hose I hook to our normal intake for pumping anti-freeze through the system prior to winter lay-up. Naturally, when I first hook that in, it's got nothing but air in it. Soon after starting the engine the entire length, about three feet, is solid purple all the way. I can't even tell the water is moving by looking at the hose.

In the case of a strainer, I guess it would depend on where the intake and output are. If the intake is on top, where the bubble is, I guess I can see it remaining. Unlike Steve, tho, I can't see it much affecting water flow rate.

Jim
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