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Old 02-13-2020, 07:55 PM   #1
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ALWAYS check your exhaust water!

BOTH engines. Simultaneously. 230hrs. Strange. Haven't figured out the root cause.
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Old 02-13-2020, 08:02 PM   #2
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Did you check your strainers? You may have gone through some grass, clogging the strainers which made the impellers work much harder.
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Old 02-13-2020, 08:04 PM   #3
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BOTH engines. Simultaneously. 230hrs. Strange. Haven't figured out the root cause.
How long since the impellers were changed?
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Old 02-13-2020, 08:07 PM   #4
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This on the exhaust elbow has saved us more than once.
As soon as there is restricted water flow, temp goes up, alarm makes noise.
$12 well spent.

https://www.trawlerforum.com/forums/...arm-38822.html
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Old 02-13-2020, 08:13 PM   #5
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This on the exhaust elbow has saved us more than once.
As soon as there is restricted water flow, temp goes up, alarm makes noise.
$12 well spent.

https://www.trawlerforum.com/forums/...arm-38822.html
How is it fixed to whatever it is measuring?

And is the alarm remote or on the unit itself?
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Old 02-13-2020, 08:16 PM   #6
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SOP: examine exhaust water-flow upon starting engine(s).
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Old 02-13-2020, 08:17 PM   #7
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I have a Borel alarm system on my exhaust. Very simple uses no power until it has an alarm condition. Mine also monitors water in fuel and high water alarms.
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Old 02-13-2020, 08:26 PM   #8
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Have Borel alarms. Observed lack of flow before alarms were an issue.

1 year old. 230hrs.

Happened immediately on splashing after only 6 hours in the yard. All fine prior. All in a clear harbor. Thru-hulls closed just prior to going into slings, reopened as soon as splashed.

Water not present at exhaust right at startup.

Very strange to me.......
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Old 02-13-2020, 08:36 PM   #9
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Could it be an air lock from the through hull to the engine meaning they were running dry?

Or,

Did they paint over the pick ups? (If you got a bottom job).
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Old 02-13-2020, 08:42 PM   #10
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Could it be an air lock from the through hull to the engine meaning they were running dry?

Or,

Did they paint over the pick ups? (If you got a bottom job).
Certainly could be, however they were closed prior to haul and reopened upon splash. If drained somehow (drripless seals?) should only have been dry for 20sec or so as hose is only 4ft from thru-hull to pump?

No bottom paint involved. Clear strainer(s) ther whole time.

Stymied.☹
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Old 02-13-2020, 09:03 PM   #11
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That is always the first thing I do right after firing up the engine. I go aft and check water flow, also check water flow in strainer. Few minutes after I go on the swim platform and check with my hand that water is warm not hot as too hot means not enough flow.

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Old 02-13-2020, 09:11 PM   #12
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Lou I also immediately check exhaust water for a full minute. I through my head over the rail aft and wait till I see a big belch of seawater. My seawater output is never steady.
Don’t check the strainer though.
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Old 02-13-2020, 09:27 PM   #13
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I always check for water from both engines right after start before doing anything else. Although with the big water lift mufflers on my engines it's also very obvious by sound if there's not enough water to keep the mufflers filled.
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Old 02-13-2020, 09:54 PM   #14
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Ditto on always checking exhaust flow after starting (and periodic checks while underway as well). As SOP it helped me to identify that my stbd transmission cooler had failed, as all of a sudden I had a bit of a slick in the exhaust flow wake... So there's multiple reasons to always check!
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Old 02-13-2020, 10:03 PM   #15
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What is funny is that, by experience, unfortunately I should say, I discovered that it is easy to find out there is no water going out of exhaust just by the sound of it. It occured once for me underway and suddenly my boat was roaring like a big truck instead of purring like an happy cat.

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Old 02-13-2020, 10:09 PM   #16
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Quote:
Originally Posted by Lou_tribal View Post
What is funny is that, by experience, unfortunately I should say, I discovered that it is easy to find out there is no water going out of exhaust just by the sound of it. It occurred once for me underway and suddenly my boat was roaring like a big truck instead of purring like an happy cat.

L
Heard of that but never experienced it. Personally, I check my exhaust water every morning just after rising, can`t be too careful .
Your hint to recheck exhaust water heat after a few minutes is a good one, so far I`ve trusted my gauges.
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Old 02-13-2020, 10:34 PM   #17
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That is definitely a sign of heat or cavitation. It might have been caused by a vacuum leak of the sea strainer caps.
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Old 02-13-2020, 11:00 PM   #18
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On my boat at least, easy to shoot the temp of the exhaust hose downstream of elbow on ER checks
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Old 02-13-2020, 11:11 PM   #19
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On my single F.L. I ALWAYS check for water output. Even though I can hear the back flow clattering and can hear the occasional big splash out the back when the muffler fills and empties.

Not so much with diesels but with gassers you could tell by the sound the instant the exhaust became "wet". Still miss that "contented gurgling"

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Old 02-14-2020, 12:48 AM   #20
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Does your boat have a seawater chest instead of seacocks for the water intakes? If so, would you have to purge air from the chest after splashing so water could reach the hoses?

I've seen photos of N47's that have them, so thought yours might as well.
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