[C320-list] Yanmar Problem

[Jeff Hare]

Yes, this is really important advise. The muffler can easily/quickly fill and flow back over the elbow and do big damage to the pistons. 
Here are the details of my flush system. 

Check out this pic of my winterizing/engine flush port: http://bit.ly/fhC3kY

The fitting is from a Prestone radiator flush kit for $5: http://bit.ly/gkzW54

The jug I use is a West Marine "engine winterizing kit" with a hole cut in the top for a garden hose to fill the jug while the engine is running. See: http://bit.ly/h1jPpw (I borrowed Al Ahlmans so often he went and bought his own :)

One added bonus is the ability to bleed air out of the raw water line if for some reason it won't prime after emptying the strainer. 

Been using this system setup since 2001. 

-jeff 

David J Cardoza <dave at avaloncon.com> wrote:

Be careful with using a hose I've been told by a Yanmar distributor based mechanic that you can force water back into the cylinder head if you're not careful. The relationship of the cylinder head to the water line keeps this in check. Don't know how real the risk but thought I'd pass it along. -----Original Message----- From: c320-list-bounces at lists.catalina320.com [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Mike Ott Sent: Monday, April 18, 2011 10:13 AM To: C320-List at Catalina320.com Subject: Re: [C320-list] Yanmar Problem Joe, Since your on the hard you could use a garden hose with an adjustable ball-value to regulate the flow and pressurize the system.  The Yanmar pump can be weak and we tend to forget that when we're in the water we have close to 12 tons of displacement helpping to pushing raw water into the engine.  Use some plastic tubing inserted into your throughull, attach a hose barb to the ball-value and connect to your garden hose.  I regulate the flow to that of a bubbler, the less pressure the better.  I use this method to check and run-out the engine before we launch, when it finally warms up in New England. Mike "Amanda Lu" #508_____________________________________________
From: Joseph Aberdale <summerwind3 at comcast.net> To: C320-List at Catalina320.com Sent: Sun, April 17, 2011 12:54:22 PM Subject: Re: [C320-list] Yanmar Problem Thanks for your responses. I inspected the impeller after I started it.  There are no missing vanes or cracks. There are no air leaks in the line.  I think water is getting to the pump because the large clear plastic filter in the line is filled with water. The boat is on the hard. I have the water intake hose disconnected from the thru hull and in a pail of water about six inches higher than the pump. Joe #908 On Apr 17, 2011, at 12:40 PM, Karl Krueger wrote: > Hello Joe: > > How old is the impeller?  Did you examine it to determine if the vanes were > damaged or cracking?  If it's older and it sat all winter it's possible that > one of the vanes broke off when the engine started. > > Also, check the through hull value, make certain it is open and water is > coming in.  It maybe the opening in clogged. > > Best wishes. > > Karl Krueger (Kindred Spirit #282, MKE WI) > > On Sun, Apr 17, 2011 at 8:50 AM, Joseph Aberdale ><summerwind3 at comcast.net>wrote: > >> I started my Yanmar in my 2002 320 and it was working fine.  After about 5 >> minutes, it stopped sucking cooling water.  Prior to starting, I opened the >> water pump and the impeller looked fine. It now refuses to suck up water >> from the pail.  Does anyone have any ideas? >> >> Thank you. >> >> Joe >> #908 >> > > > > --Karl W Krueger - ABR, CRS, GRI, CDPE > RE/MAX Realty 100 > Phone - 414-322-6541 > Fax - 414-327-6870