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Old 07-07-2014, 01:25 PM   #1
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First jackass manuever as a trawler owner.

I left the dock with my raw water seacock closed. The engine did not over heat until I ran up the rpms well out of the harbor. I shut the engine down and jumped down into the engine room to inspect everything. The raw water pump was super hot and then I noticed the seacock closed. We drifted in calm water for about 10 minutes and I turned the engine back on and the temp went right down.

I remember reading here somewhere that an owner leaves his boat keys on the handle of the seacock every time he closes it for any reason. At the time I thought to my self, " That's a great idea!." Well, from now on I will put that idea into practice. Lesson learned.
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Old 07-07-2014, 01:36 PM   #2
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Change your impeller- the excessive heat can damage the rubber.

Cheap insurance.
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Old 07-07-2014, 01:41 PM   #3
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+1!
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Old 07-07-2014, 01:41 PM   #4
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I use this tag when the engine isn't set up to run as when having the raw-water inlet closed.



Also examine exhaust for water while/before untying the boat.
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Old 07-07-2014, 01:50 PM   #5
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Quote:
Originally Posted by Pau Hana View Post
Change your impeller- the excessive heat can damage the rubber.

Cheap insurance.
I was afraid some one would say that. It is (was) a brand new impeller and a real headache to replace. I will add it onto my short list, especially since my insurance agent recommends it. I may get one of the impeller extractor tools to assist me.
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Old 07-07-2014, 01:53 PM   #6
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Also, get in the habit of checking for water flow from the exhaust after starting the engine and before leaving the slip.
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Old 07-07-2014, 02:04 PM   #7
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Also, get in the habit of checking for water flow from the exhaust after starting the engine and before leaving the slip.
I dont get water out of my exhaust when I am idling. I am not sure how my exhaust works. I know some goes out the side above the water line and some goes below the waterline.
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Old 07-07-2014, 02:09 PM   #8
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Ok, I just ordered two of these from amazon. About $2.50 each
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Old 07-07-2014, 02:17 PM   #9
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Quote:
Originally Posted by Giggitoni View Post
Also, get in the habit of checking for water flow from the exhaust after starting the engine and before leaving the slip.
Quote:
Originally Posted by bligh View Post
I dont get water out of my exhaust when I am idling. I am not sure how my exhaust works. I know some goes out the side above the water line and some goes below the waterline.
If you're asking for advice, I'd caution you against starting the engine again without changing the impeller...especially if you can't verify that the engine is pumping cooling water.

Do you see water exiting your exhaust at power settings above idle?
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Old 07-07-2014, 02:37 PM   #10
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Generally even exhausts that defer under water while under way will also spit water out at idle above water line, for two reasons there us not enough pressure at idle to expel exhaust water underwater and to show you that your cooling system is working. at least that was the case in a former boat I owned.

You should check your impeller as other have said it sounds as though a vane or two might be missing.

We also have a reminder taped at the helm which reminds us to check the fuel manifold every morning and thru hulls when we close them which is not unless we leave the boat for an extended time.

We also have a pre start check list which I use religiously it helps me to remember to turn my stabilizers to neutral, among other things and it also reminds me to turn them to center before casting off.

Some may laugh at check lists but pilots have been doing them for yeons for a reason.
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Old 07-07-2014, 02:59 PM   #11
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I have one of these to go in our boat.

Cooling Water Flow : AQUALARM, Warning Systems For Land And Sea

Not too spendy at all. Just need the right place to splice it into the cooling water circuit.

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Old 07-07-2014, 03:13 PM   #12
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Quote:
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Do you see water exiting your exhaust at power settings above idle?
I see a little bit of water coming out of the exhaust at cruising speeds but none during idle. There is a 2" outlet that exits above the water line and a 4" or 6" outlet below the water line. I assumed that during idle the water just drains out through the lower exhaust exit.

I dont really have any way to verify water flow through the system other than manually feeling the cooling system at its various locations when it is running. Typically after the raw water pump, I can feel that it is cold or cool as it passes through fuel return cooler before it enters the after cooler (I do have one of the IR guns- I just dont break it out unless I need something specific). I can also (carefully) put my hand on the heat exchanger to see that it is cool/warm as well. When I touched it after the temperature alarm wend off it was really hot to the touch but cooled off immediately after starting with the sea-cock open.
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Old 07-07-2014, 03:17 PM   #13
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Originally Posted by She-Kon View Post
I have one of these to go in our boat.

Cooling Water Flow : AQUALARM, Warning Systems For Land And Sea

Not too spendy at all. Just need the right place to splice it into the cooling water circuit.

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Old 07-07-2014, 03:19 PM   #14
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If you're asking for advice, I'd caution you against starting the engine again without changing the impeller...especially if you can't verify that the engine is pumping cooling water.
I did verify that the engine was pumping raw water. I ran it for 30 -40 hours over the weekend after the overheating incident and engine temperatures were fine. I have a spare impeller that I will install next weekend. Hopefully I wont have to disassemble the aftercooler again to fish out missing vanes.

It would be nice to have a better indicator of raw water flow at the dock though. What about an exhaust temperature gauge?
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Old 07-07-2014, 03:23 PM   #15
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May not be a bad idea to have one of these down stream of the pump if you have the room.

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Old 07-07-2014, 03:25 PM   #16
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Quote:
Originally Posted by bligh View Post
I left the dock with my raw water seacock closed. The engine did not over heat until I ran up the rpms well out of the harbor. I shut the engine down and jumped down into the engine room to inspect everything. The raw water pump was super hot and then I noticed the seacock closed. We drifted in calm water for about 10 minutes and I turned the engine back on and the temp went right down.

I remember reading here somewhere that an owner leaves his boat keys on the handle of the seacock every time he closes it for any reason. At the time I thought to my self, " That's a great idea!." Well, from now on I will put that idea into practice. Lesson learned.
I did the same thing last fall but I didnt get so lucky and have the temps drop on restart. The impeller was only a few months old.The one on the left is the results of my lapse in memory.
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Old 07-07-2014, 03:28 PM   #17
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QUOTE: It would be nice to have a better indicator of raw water flow at the dock though. What about an exhaust temperature gauge?

We have both. The water flow is first. If you loose the flow, the alarm sounds before the engine temperature rises so you have a little time if you have get out of a channel or when you are docking before the engine temperature rises and the engine has to be shut down.
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Old 07-07-2014, 03:29 PM   #18
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Being a natural jackass, I found having a pre-departure checklist to be invaluable. One item of several is checking all the strainers and attendant seacocks. Checking water flow after start is another. No need to do anything with the keys or tags etc, though a tag like shown (I just used a post it note) may be handy if there was something unusual going on.

You need to find out where your exhaust water goes ASAP!! And how every other vital fluid and electrical current flows too!
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Old 07-07-2014, 04:18 PM   #19
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I have one of these to go in our boat.

Cooling Water Flow : AQUALARM, Warning Systems For Land And Sea

Not too spendy at all. Just need the right place to splice it into the cooling water circuit.

I could install this in between the strainer and the raw water pump. Does the alarm sound when the key is on engine off? That would be great to verify the alarm is working properly.
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Old 07-07-2014, 04:42 PM   #20
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I could install this in between the strainer and the raw water pump. Does the alarm sound when the key is on engine off? That would be great to verify the alarm is working properly.
that's where I mounted mine....just in front of the raw water pump...

bad news is...yes you may hear the alarm on start...but most low oil pressure alarms are louder.

I'll get around to installing latching solenoids in the alarm system so I can disable the alarm noise but keep the warning lights. Too much noise sounds like an emergency which scares too many passengers and makes them less than capable of helping with the emergency/bad situation.
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