Marlon seacock rotates past closed

[alctel]

One of my seacocks rotates past closed, the handle continues past the 90 degree angle and the 'ball' rotates past so it ends up partially open.

How does the seacock restrict the handle movement, am I missing a set screw or something?

[Manateeman]

We pulled out every Forespar Seacock and replaced them with Groco adaptor plates and stainless ball valves because we’ve seen numerous reports of frozen valves and broken handles.
A number of members still believe in plastic like Forespar and TruDesign which is not even bolted to the hull.
Go to the MarineHowTo web pages for complete instructions on replacing these plastic toy boat parts. You’ll sleep better.
The manatee crew of professional boatbuilders.

[tkeithlu]

The seacock is supposed to have a block stopping the handle from turning past 90 degrees. It's part of the casting. You can see the track that the handle turns in, and where the bump should be, right under the handle. But, being plastic, yours may not have that block in place. Yes, while Mark has not explained just how manatees with their flippers and blubberous butts can possibly repair through-hulls, his point about "plastic toy boat parts" is well taken. Lots of boaters get along with Maralon seacocks, but if you need to replace one, I recommend that you go with bronze.

[alctel]

Update: Took it out, glassing over it. One less hole in the boat.

[tkeithlu]

Good for you. I only have two - one is sewage discharge, which is only opened in my presense, and the other is everything else, and can be closed from the salon above the engine room. It means more hoses, but no holes in hard-to-reach places.

[redneckrob]

Originally Posted by Manateeman

We pulled out every Forespar Seacock and replaced them with Groco adaptor plates and stainless ball valves because we’ve seen numerous reports of frozen valves and broken handles.
A number of members still believe in plastic like Forespar and TruDesign which is not even bolted to the hull.
Go to the MarineHowTo web pages for complete instructions on replacing these plastic toy boat parts. You’ll sleep better.
The manatee crew of professional boatbuilders.

Of course there are tens of thousands of Marelon seacocks that are operating just fine and plenty of frozen Groco valves out there. As far as I know there isn't a single boat at the bottom of the ocean that would still be with us today if they had only gone Graco instead of Marelon. Not to mention the chemical industry that has used PMCs extensively for decades in applications far more demanding than a seacock.

Calling them "plastic toy boat parts" is not only inaccurate but pretty immature. You don't like em, great, your boat, you're free to do a bunch of unnecessary replacement work. But one wonders why you feel the need to attack and denigrate in such a childish fashion something that is a well proven, perfectly legitimate product?

[sowwaninii]

Agree. All seacocks, regardless of composition, need to be exercised regularly. Should be part of any monthly maintenance schedule.

[stormalong]

Originally Posted by Manateeman

We pulled out every Forespar Seacock and replaced them with Groco adaptor plates and stainless ball valves because we’ve seen numerous reports of frozen valves and broken handles.
A number of members still believe in plastic like Forespar and TruDesign which is not even bolted to the hull.
Go to the MarineHowTo web pages for complete instructions on replacing these plastic toy boat parts. You’ll sleep better.
The manatee crew of professional boatbuilders.

Originally Posted by tkeithlu

The seacock is supposed to have a block stopping the handle from turning past 90 degrees. It's part of the casting. You can see the track that the handle turns in, and where the bump should be, right under the handle. But, being plastic, yours may not have that block in place. Yes, while Mark has not explained just how manatees with their flippers and blubberous butts can possibly repair through-hulls, his point about "plastic toy boat parts" is well taken. Lots of boaters get along with Maralon seacocks, but if you need to replace one, I recommend that you go with bronze.

Originally Posted by redneckrob

Of course there are tens of thousands of Marelon seacocks that are operating just fine and plenty of frozen Groco valves out there. As far as I know there isn't a single boat at the bottom of the ocean that would still be with us today if they had only gone Graco instead of Marelon. Not to mention the chemical industry that has used PMCs extensively for decades in applications far more demanding than a seacock.

Calling them "plastic toy boat parts" is not only inaccurate but pretty immature. You don't like em, great, your boat, you're free to do a bunch of unnecessary replacement work. But one wonders why you feel the need to attack and denigrate in such a childish fashion something that is a well proven, perfectly legitimate product?

Here we go again. Mark the manatee is man obsessed about plastic seacocks. He chooses to use bronze on his aluminum hull even though they are galvanic enemies. The broken handle issue was corrected 30 years ago but some people just won't let go.

redneckrob is right. Tens of thousands of these valves are in use. And they do make properly flanged ABYC compliant seacocks that can be through bolted if you really think that is necessary. My 1985 boat was built with them and I have added a few over the years. Not one has failed. Can that be said about bronze?

I have replaced some of them. When I came across a few new unused flanged ones at a used boat parts store, I said to myself: "may as well replace them". Mine are held in place by the threaded through hulls and additionally screwed into epoxy coated plywood backers that are glued to the hull. The old ones are still sitting in my spare parts locker and I would not hesitate to use them again if needed.

PS. I have one 1.5 inch that will turn past closed. No big deal as it is obvious by the handle position when it is closed. Some were made that way.

[Orion Jim]

Originally Posted by stormalong

Here we go again. Mark the manatee is man obsessed about plastic seacocks. He chooses to use bronze on his aluminum hull even though they are galvanic enemies. The broken handle issue was corrected 30 years ago but some people just won't let go.

redneckrob is right. Tens of thousands of these valves are in use. And they do make properly flanged ABYC compliant seacocks that can be through bolted if you really think that is necessary. My 1985 boat was built with them and I have added a few over the years. Not one has failed. Can that be said about bronze?

I have replaced some of them. When I came across a few new unused flanged ones at a used boat parts store, I said to myself: "may as well replace them". Mine are held in place by the threaded through hulls and additionally screwed into epoxy coated plywood backers that are glued to the hull. The old ones are still sitting in my spare parts locker and I would not hesitate to use them again if needed.

PS. I have one 1.5 inch that will turn past closed. No big deal as it is obvious by the handle position when it is closed. Some were made that way.

Yes it can. My bronze Spartan seacocks, not ball valves, are factory original and in perfect working order after thirty eight seasons.

[stormalong]

Originally Posted by Orion Jim

Yes it can. My bronze Spartan seacocks, not ball valves, are factory original and in perfect working order after thirty eight seasons.

And how often do you take them apart and service them?

[Manateeman]

We have stainless Groco adaptor plates and stainless ball valves isolated from the hull. Not bronze.
We have the right to express our personal opinions on this forum.
Interesting how someone “knows” what is inside our vessel.
NO.
The manatee crew is rolling around o the deck in fits of laughter at the antics in some posts. Maybe they are toy boat building experts.
Captain Mark and his manatee crew of professional boatbuilders.

[stormalong]

Originally Posted by Manateeman

We have stainless Groco adaptor plates and stainless ball valves isolated from the hull. Not bronze.
We have the right to express our personal opinions on this forum.
Interesting how someone “knows” what is inside our vessel.
NO.
The manatee crew is rolling around o the deck in fits of laughter at the antics in some posts. Maybe they are toy boat building experts.
Captain Mark and his manatee crew of professional boatbuilders.

Galvanic corrosion is even worse for stainless than bronze.

https://fairwindfasteners.com/blogs/...YaAthFEALw_wcB

HA HA, ROTFLMAO my boat will still be going strong long after you will have to cut out and replace corroded aluminum plate.

I can express my personal opinions as well. Unless of course if I disagree with the great shipbuilder Manateeman.

[Orion Jim]

Originally Posted by stormalong

And how often do you take them apart and service them?

Let’s not move the goal posts…..
None have “failed”, all are serviced regularly.

[stormalong]

Originally Posted by Orion Jim

Let’s not move the goal posts…..
None have “failed”, all are serviced regularly.

You are right. I have a knee jerk reaction to Manateeman who feels that he has the only right solution and all others are wrong.

Apology for my response. Bronze is a very good material for seacocks on fiberglass boats.

And I need to not hijack threads and try to ignore others that do.

[goboatingnow]

Originally Posted by Manateeman

We have stainless Groco adaptor plates and stainless ball valves isolated from the hull. Not bronze.

We have the right to express our personal opinions on this forum.

Interesting how someone “knows” what is inside our vessel.

NO.

The manatee crew is rolling around o the deck in fits of laughter at the antics in some posts. Maybe they are toy boat building experts.

Captain Mark and his manatee crew of professional boatbuilders.

Absolutely entitled to your options , not however to denigrate others opinions

Ps you’ve no “ rights “ on a private forum, only what the owners decide to allow you to do