[C320-list] Engine seacock and no water out the exhaust - 27 hp, 3G Yanmar

[John Frost]

Word of warning. I zip tied my holding tank discharge thru hull closed to be able to show the authorities that I was not discharging. After about two years, the thru hull suddenly split wide open and the boat almost sank. My post incident failure analysis showed me that I had zip tied the handle to a large adjacent hose that vibrated at certain speeds under power. To make matters worse, the zip tie load was perpendicular to the normal load to rotate the handle. This vibration fatigued the thru hull body and caused catastrophic failure. 

Sent from my iPhone
John Frost

> On Jul 12, 2016, at 11:14 PM, Dprudden <dprudden at comcast.net> wrote:
> 
> You can always tie or zip tie the seacock open. That's how my holding tank they hull was.
> 
> David Prudden
> #787
> 
> Sent from my iPhone
> 
>> On Jul 12, 2016, at 3:57 PM, <tharrison at innovations-plus.com> <tharrison at innovations-plus.com> wrote:
>> 
>> Thanks in advance Jeff. I just got back from the boat. Three of the four
>> screws are tight and I gave them an additional 1/8 turn. The fourth screw is
>> loose and does not tighten. I think it is stripped ? 
>> 
>> Ted
>> 
>> -----Original Message-----
>> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf
>> Of Jeff Hare
>> Sent: Tuesday, July 12, 2016 1:38 PM
>> To: C320-List at Catalina320.com
>> Subject: Re: [C320-list] Engine seacock and no water out the exhaust - 27
>> hp, 3G Yanmar
>> 
>> I'll post a series of pictures in the C320 Photo Technical Photos gallery
>> showing the details, the disassembly and parts of the thru-hull valves next
>> time I get to the boat.
>> 
>> I have a spare Forespar thru-hull assembly that I can break down.  This
>> should clear up all the magic surrounding our thru-hull fittings and make a
>> good reference.
>> 
>> Cheers!
>> -Jeff Hare
>> #809 Woodbine II
>> 
>> -----Original Message-----
>> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf
>> Of tharrison at innovations-plus.com
>> Sent: Tuesday, July 12, 2016 10:18 AM
>> To: C320-List at Catalina320.com
>> Subject: Re: [C320-list] Engine seacock and no water out the exhaust - 27
>> hp, 3G Yanmar
>> 
>> Thanks Jeff, I will tighten the four screws and see if this helps. I removed
>> the water strainer, with great fear. Cleaned the filter and no leaks. 
>> 
>> When I first purchased the boat the seacock was real hard to open and close.
>> I purchased special grease ($$$) from the marine supply store. I have
>> applied this every haul out for the last three years. It turns nice an easy
>> now. I think I will skip this maintenance practice next year. 
>> 
>> Ted
>> 
>> -----Original Message-----
>> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf
>> Of Jeff Hare
>> Sent: Monday, July 11, 2016 9:27 PM
>> To: C320-List at Catalina320.com
>> Subject: Re: [C320-list] Engine seacock and no water out the exhaust - 27
>> hp, 3G Yanmar
>> 
>> Ted,
>> 
>> Does the seacock handle turn so easily that it could possibly close on its
>> own?  That's really unusual for these valves.  Usually it's the opposite
>> problem.
>> 
>> Anyway, if you look at the top of the seacock, you'll see 4 stainless steel
>> Philips head machine screws.  You can try snugging these up a little.  Not
>> Sampson strength tightening, just good and snug.  Tightening/loosening
>> slightly changes the pressure on the ball in the valve and may solve the
>> problem.
>> 
>> The white ring on the side of the handle hides a screw that holds the handle
>> on.  The white ring is actually a plug for the outside of the thru-hull.  It
>> has a loop on it for tying a string to.  You can safely just pull this white
>> plug out of the handle, as it is only held in place by friction of little
>> O-ring.
>> 
>> Do not under any circumstances remove the screw in the handle itself while
>> the boat is in the water!!!  Doing so, will probably blow the screw and
>> various washers half way across the boat and you'll be hard pressed to get
>> them back in with water coming into the boat.  So, don't remove the handle!!
>> But it is ok to tighten/adjust the screws on the top of the thru-hull body a
>> little.
>> 
>> If the handle is really loose, I suspect that it isn't sealing that well and
>> would leak if the hose, raw water filter or impeller cover were removed.
>> 
>> I would see if you can check this before removing the impeller cover.
>> 
>> -Jeff Hare
>> 
>> 
>> 
>> -----Original Message-----
>> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf
>> Of tharrison at innovations-plus.com
>> Sent: Monday, July 11, 2016 1:38 PM
>> To: C320-List at Catalina320.com
>> Subject: [C320-list] Engine seacock and no water out the exhaust - 27 hp, 3G
>> Yanmar
>> 
>> I went out for sail and engine overheated.  I checked and the seacock was ¾
>> closed. So I opened it and all good. So I thought, when did I close it! Went
>> out yesterday and the same thing happened and it was closed. This time I
>> knew I did not close it.  Only this time it does not pump water so I think I
>> may have killed the impeller.
>> 
>> 
>> 
>> So what cause the seacock to close. How do you tighten it so does not close
>> on its own? There are four screws and a white ring on the side. The ring
>> just turns and does not appear to do anything.  Any suggestions.
>> 
>> 
>> 
>> The second question does anyone have the instructions to change the
>> impeller. Is it just a matter of taking the four bolts out? If pieces of the
>> impeller are in the water heat exchanger what is the  best way to get them
>> out?
>> 
>> 
>> 
>> 
>> 
>> 1997
>> 
>> Hull 424
>> 
>> 
>> 
>> Thanks
>> 
>> 
>> 
>> Ted
>> 
>> 
>> 
>> 
>> 
>> 
>> 
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