[C320-list] Yanmar Problem

[Fred LEcuyer]

I've had similar issues when I was in the water but had disconnected the raw water intake line to clear the strainer. I thought I was in for a big delay and hunt for the source of the air pocket even though I had refilled the raw water line to the pump.

With some trepidation, I increased the engine revs and after several seconds, the water came through just fine.  Don't know if this will help your current circumstance, but it's maybe something to try after trying all the other solutions.

Fred

First light
Hull 926

> Date: Mon, 18 Apr 2011 09:50:54 -0500
> From: dave at avaloncon.com
> To: C320-List at Catalina320.com
> Subject: Re: [C320-list] Yanmar Problem
> 
> 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