exhaust air lock

Posted by Merrick White (r__merrick_white@…>)

It seems that any time we sail our F32 in stout wind and my hard
sailing wife (motto: “reefing is for weenies”) attempts to put the
rail in the water the exhaust does not pump raw water afterwards when
starting the motor. If I unscrew the clamp from the pump exit and pull
the hose for a few seconds that fixes it.

I am assuming this happens because an air lock forms in the raw water
exhaust somewhere. Has anyone else experienced this and can it be
solved?

Thanks,
Merrick White

Posted by William A. Cormack (wacormack@…>)

Can’t say it has happened to me even though I sometimes sail like your wife.
But I can say hang on to your wife if she likes to sail that much.

Bill


William A. Cormack, CPA
Principal and Chief Financial Officer
Whelan Associates, LLC, a Corporate Real Estate Service Firm
100 Faunce Corner Executive Center, Suite 150
500 Faunce Corner Road
North Dartmouth, MA 02747
Voice: 508-984-4100, Fax: 508-984-4101, Cell 508-254-5828
MailTo:wacormack@…
----- Original Message -----
From: “Merrick White” <r__merrick_white@…>
To: <freedomyachts2003@yahoogroups.com>
Sent: 05/17/2005 10:01 AM
Subject: [freedomyachts2003] exhaust air lock

\

It seems that any time we sail our F32 in stout wind and my hard
sailing wife (motto: “reefing is for weenies”) attempts to put the
rail in the water the exhaust does not pump raw water afterwards when
starting the motor. If I unscrew the clamp from the pump exit and pull
the hose for a few seconds that fixes it.

I am assuming this happens because an air lock forms in the raw water
exhaust somewhere. Has anyone else experienced this and can it be
solved?

Thanks,
Merrick White

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Posted by Michel Capel (mike_c_f35ck@…>)

An airlock in the raw water exit should be impossible. Most yachts
have a valve in the exit hose to make sure an airlock exists; this to
prevent back suction/ siphoning via the raw water exit back to the
engine. You could check this small upside down Y-valve; there is a
tiny lid in it that should close and prevent air coming in when the
pump starts sucking in water. The lid opens and lets in air when the
pump stops sucking.


— In freedomyachts2003@yahoogroups.com, “Merrick White”
<r__merrick_white@h…> wrote:

It seems that any time we sail our F32 in stout wind and my hard
sailing wife (motto: “reefing is for weenies”) attempts to put the
rail in the water the exhaust does not pump raw water afterwards when
starting the motor. If I unscrew the clamp from the pump exit and
pull
the hose for a few seconds that fixes it.

I am assuming this happens because an air lock forms in the raw water
exhaust somewhere. Has anyone else experienced this and can it be
solved?

Thanks,
Merrick White

Posted by macks011 (macks04@…>)

Heeling that sharply causes you to lose prime in the raw water
pump when the intake comes out of the water. Posssible culprits are
a worn impeller or worn impeller seat.
It seems once you have prime you are ok, but your pump does not have
enough oomph to re-establish prime once you lose it. You could also
have an air leak anywhere on the suction side of the raw water pump.
You need to check the connections from the seacock to the strainer,
the strainer itself and from the strainer to the pump.




— In freedomyachts2003@yahoogroups.com, “Merrick White”
<r__merrick_white@h…> wrote:

It seems that any time we sail our F32 in stout wind and my hard
sailing wife (motto: “reefing is for weenies”) attempts to put the
rail in the water the exhaust does not pump raw water afterwards
when
starting the motor. If I unscrew the clamp from the pump exit and
pull
the hose for a few seconds that fixes it.

I am assuming this happens because an air lock forms in the raw
water
exhaust somewhere. Has anyone else experienced this and can it be
solved?

Thanks,
Merrick White

Posted by Kevin Ogden (kcogden@…>)

Check to see that your raw water pump’s internal faces have not become grooved. We had same aggravating problem for a long time, then I replaced the circular flat seal plate as the old one had what appeared to be insignificant grooving/wear, and presto problem went away. Appears grooves, though very shallow, were allowing just enough water by to break water lock when raw water intake exposed during heel/heavier weather.

----- Original Message -----
From: Merrick White
To: freedomyachts2003@yahoogroups.com
Sent: Tuesday, May 17, 2005 3:01 PM
Subject: [freedomyachts2003] exhaust air lock
It seems that any time we sail our F32 in stout wind and my hard sailing wife (motto: “reefing is for weenies”) attempts to put the rail in the water the exhaust does not pump raw water afterwards when starting the motor. If I unscrew the clamp from the pump exit and pull the hose for a few seconds that fixes it. I am assuming this happens because an air lock forms in the raw water exhaust somewhere. Has anyone else experienced this and can it be solved?Thanks,Merrick White