Sea water in Engine

[Fstued]

I have a Newport 30 that has failed to start many times after sailing in a sea. After much frustration I have realized water is coming back up the exhaust system and into the engine. It seems like I need an anti siphon device to solve the problem. there was one there but apparently it wasn't doing the job, seawater was dripping into the carburetor from the cylinders. Access to the exhaust system is a problem. I have a few ideas but I am looking for suggestions. I think I should make the loop go has high as possible unless there is a product out there that will solve the problem.
Anny suggestions.

Here is a picture of the exhaust muffler I took off the engine. I felt the loop just wasn't high enough but I am just unsure thanks

[ndutton]

OK, I read back through your previous posts and I think you may have more of a problem than an anti siphon valve.

The Newport 30 was originally built with a standpipe exhaust system. From what I can gather, yours no longer does suggesting a previous owner made significant modifications to the exhaust. Unless it's done well with the proper elevations and waterlift capacity it's doomed. A detailed understanding of any exhaust system is critical and who knows what the P.O. did or didn't understand.

I also read 8 months ago you intended to connect a hose between the engine manifold and the exhaust thru hull directly and rely on an external flapper to prevent backwash. It's important for us to know if you did this. We really need an accurate drawing or pictures of what you have to be able to help.

[Fstued]

I never modified the exhaust but I did put a new flapper at the discharge on the transom. I'll take a picture of what was there before for the where the water exited the manifold.
Previously I thought I had a rusted through manifold so I pulled the engine with intent of rebuilding it which will happen since it is out of the boat. So far it doesn't seem to be that bad but the heads haven't been pulled. I just want to make sure the sea water doesn't get back into the engine since there is now lots of room in the engine room.
Thanks I'll post a pic latter on today

[Al Schober]

Friend had a Catalina 27 with issues with water coming back up the exhaust. He took the quick fix - when he shut the engine off, he pushed a rubber stopper into the transom exhaust. Restarting the engine would pop out the stopper. A cord kept it from getting away. Not USCG approved, but it worked as long as he remembered to install the stopper.

[Fstued]

I might have to resort to that. It certainly is easy and cheap

[ndutton]

Assumes you're getting water up the wazoo and I'm not sure that's been established yet.

[Fstued]

Jeff Is the part on backwards? The flange at the bottom of the picture is where it attaches to the manifold which is close to where the cooling water exits the engine and enters the exhaust pipe/system. At least this is how I understand it
The back wash seawater I believe comes in through the diagonal piece at the top of the photo and into the engine and manifold through the through the larger pipe at the bottom of the photo.
Am I wrong? I now am very confused. That is the way it has been on the boat since I have owned it.
some one please tell me how this thing works
thanks

[BunnyPlanet169]

Fstued:

I may be wrong - here's another installation where it's the same as yours. It looks counter intuitive, but I guess the water flows around the top first. SORRY.

https://www.moyermarine.com/forums/showpost.php?p=11386&postcount=1

[lat 64]

Suss it out

Nice catch Jeff! Correction: See post #10 below

Fstued,
Stick a garden hose on the water injection fitting and watch what pipe the water comes out (most). You'll get the picture then.

Nothing like P.O. work to confound a problem. I just fixed a Paslode cordless nailer I got for free because a silly little part was installed backwards. It's back on the job and the guy who gave it to me has to watch me use it every day now.

Today the internet is good, not always the case.

Russ

[BunnyPlanet169]

Russ - I deleted the post - I think the elbow may be installed correctly, although it looks funny to those of us with pipe. It may have a leak internally however.

Now I'm confused....

[edit - I've found a number of forum pictures showing the same installation. Water cools the entire elbow and mixes on the other side. It may be corroded or blocked internally however, due to hot exhaust and raw water.]

[ndutton]

Is there a reason the factory original exhaust configuration is being avoided?

[joe_db]

If there is any way to go back to a standpipe I would do it.

[Fstued]

What is the original factory installation. I am willing to go to that or use a stand pipe Is that what I am seeing being sold by Moyer. I don't have a problem with it
Thanks

[ndutton]

The Newport 30 was fitted with a standpipe exhaust system at the factory. In some ways it is considered superior to a waterfift but needs available space and elevation to function properly which of course the N30 has.

Refer to the attached drawings. You'll need to fabricate a hot section from the back of the manifold up and to port out of pipe parts (do not be tempted to use galvanized pipe, black iron or stainless are USCG compliant, galvanized is NOT). I suggest a street ell in the exhaust coupling aimed at a 45° up angle, a suitable length of pipe threaded into it, a 45° elbow to direct the pipe vertically and a length of pipe to fit into the bottom of the standpipe. The standpipe will be located in the forward end of the port cockpit locker as high as possible and mounted securely. The top of the standpipe should be immediately under the cockpit seat. You'll have to measure the pipe lengths on board to get them right.

The hot section must be shielded for heat (Moyer offers an exhaust wrap kit). Note also that as far as I know, Moyer Marine is the only source for off the shelf standpipes. The standpipe is essentially water jacketed so no need to shield it.

Raw water from the manifold exit (if raw water cooled) is delivered via hose to the standpipe water inlet port. There is no need to provide an anti siphon of any sort with this system.

The exhaust outlet of the standpipe is connected via exhaust hose to the transom thru hull in a continuous downhill run.

And that's all there is to it. I've tossed in a dissection of your existing exhaust elbow for your viewing pleasure too.

[Fstued]

The Newport 30 was fitted with a standpipe exhaust system at the factory. In some ways it is considered superior to a waterfift but needs available space and elevation to function properly which of course the N30 has.

Refer to the attached drawings. You'll need to fabricate a hot section from the back of the manifold up and to port out of pipe parts (do not be tempted to use galvanized pipe, black iron or stainless are USCG compliant, galvanized is NOT). I suggest a street ell in the exhaust coupling aimed at a 45° up angle, a suitable length of pipe threaded into it, a 45° elbow to direct the pipe vertically and a length of pipe to fit into the bottom of the standpipe. The standpipe will be located in the forward end of the port cockpit locker as high as possible and mounted securely. You'll have to measure the pipe lengths on board to get them right.

The hot section must be shielded for heat (Moyer offers an exhaust wrap kit). Note also that as far as I know, Moyer Marine is the only source for off the shelf standpipes. The standpipe is essentially water jacketed so no need to shield it.

Raw water from the manifold exit (if raw water cooled) is delivered via hose to the standpipe water inlet port. There is no need to provide an anti siphon of any sort with this system.

The exhaust outlet of the standpipe is connected via exhaust hose to the transom thru hull in a continuous downhill run.

And that's all there is to it. I've tossed in a dissection of your existing exhaust elbow for your viewing pleasure too.

Thanks that is a great sketch and just what I was looking for. That is what I wil try to create.I was also going to raise the exhaust hose going to the transom to make it has high has possible. Now that the engine is apart it is apparent that water was in the cylinders, rust. But over all the engine is in relatively good shape. I am sure there is room to raise the stand pipe to make it work. Thanks