If an external strainer then make sure it’s one that hinges open so it can be 
cleaned out ... either with a dive or during haul-out. 

Without an external strainer and a straight-run from internal strainer to 
seacock you can rod-out the intake if needed.

I upgraded our raw water intake from 1/2 to 3/4 inch when I redid through-hulls 
last year. I didn’t install the external strainer since the old intake didn’t 
have one and I figured if I had problems it wouldn’t be hard to install during 
the next haul-out. 

We have a Vetus strainer.

Peter Fell
Sidney, BC
Cygnet
C&C 27 MkIII

From: John and Maryann Read via CnC-List 
Sent: Wednesday, August 19, 2015 4:06 AM
To: cnc-list@cnc-list.com 
Cc: John and Maryann Read 
Subject: Re: Stus-List Raw water intake fouling A4

Hi Rob

 

Good to see you the other day in Noank.  We have the Yanmar 3GM with Sendur 
fresh water conversion.  Raw water inlet is ½ inch opening with no strainer 
using proper barrel type seacock, straight hose connection to a screw on 
plastic strainer then hose to engine.  The strainer is forward of the engine 
with clear plastic barrel so easy to see each time we move the stairs.  I make 
it a habit to unscrew and clean every few weeks as it does catch eel grass and 
gets crudded up.   I also listen for healthy water flow from the exhaust every 
time I start the engine.  No problems for 16 years now

 

 

John and Maryann

Legacy III

1982 C&C 34

Noank, CT

 

 

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Robert 
Gallagher via CnC-List
Sent: Tuesday, August 18, 2015 10:16 PM
To: cnc-list@cnc-list.com
Cc: Robert Gallagher
Subject: Stus-List Raw water intake fouling A4

 

I went from a 30-1 with an A-4 to a 30-2 with a Yanmar 2gm20F.

 

My AF had no 90 elbow from the seacock.  No internal strainer, just the little 
colander screwed to the outside of the hull.

 

My Yanmar has the 90 degree elbow, internal strainer, no pasta strainer on the 
outside.

 

Well, last week I started motoring and the Temp alarm went off.  I shut it down 
and checked the internal strainer and it was clean enough.  Started the engine, 
no temp alarm but I could see straight away no water coming through the exhaust.

 

Pulled off the hose and opened the seacock...barely a dribble.

 

Pulled off the elbow and I could see seaweed jammed up in there.  The top of 
the 90 deg. elbow has a threaded plug so I removed that.  Still had a job 
getting the jammed up weed out with needle nose and a screwdriver.

 

Thinking of putting an external strainer on the intake this winter....

Good idea or NOT so good?????

 

Rob

C&C 30 MKII

Hanuman

Noank, CT




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