[C320-list] Engine noise

[Kirk McCullough]

I have the old  type and burp it after every haul out, and then once or 
twice a month during the season just to be sure.

Kirk
----- Original Message ----- 
From: <jonvez at comcast.net>
To: "C320-List" <c320-list at catalina320.com>
Sent: Monday, July 16, 2007 8:03 AM
Subject: Re: [C320-list] Engine noise


> One other note on the PSS--If you have the old style (the one without a 
> water feed) like I do, I pretty much burp it before I go out if I haven't 
> had the boat out for a week or so. I've found that it isn't just a diver 
> that can displace water with air and apparently on our hulls for whatever 
> reason this is not uncommon. Anyway, as others have indicated, burping is 
> an easy procedure and it goes a long way in ensuring their are no issues 
> with the seal getting hot.....
>
> Regards,
>
> Jon
>
> -------------- Original message -------------- 
> From: "james_delong" <james_delong at bellsouth.net>
>
>> Jeff, Stan, and Jon,
>>
>> Thanks for the explanations! I do have a PPS. For awhile things were 
>> really
>> funky out there, so prop cavitations could have been occurring. After
>> unsuccessfully attempting to duplicate the problem at the dock I'd guess 
>> my
>> approach will be to go on with life and assume all is well!
>>
>> Jeff...how do I burp the PSS if this happens again?
>>
>> Thanks to all again!!
>>
>> Jim
>>
>> ----- Original Message ----- 
>> From: "Jeffrey Hare"
>> To: "'C320-List'"
>> Sent: Monday, July 16, 2007 9:01 AM
>> Subject: Re: [C320-list] Engine noise
>>
>>
>> > Jim,
>> >
>> > If you do have a PSS and notice this sound, go down below and see if 
>> > the
>> > PSS is warm, and burp it to see if there's any air in there. If it has
>> > plenty of water in it, then it's less likely to chatter. Without water,
>> > it
>> > can chatter under the right circumstances.
>> >
>> > Another possibility is that a shaft zinc has loosened up and slid down
>> > against the cutlass.
>> >
>> > Final thing I could think of is that if you have a bronze shaft and the
>> > alignment is not quite perfect, you could be experiencing shaft whip 
>> > when
>> > the right combination of prop loading and RPM are hit. Worn engine 
>> > mounts
>> > would help make this worse.
>> >
>> > FYI: As for the RPM, 2900-3000 is really the Yanmar's sweet spot on the
>> > power curve and as Jon said, can run for days at a time there. Contrary
>> > to
>> > what seems intuitive, running the engine at lower uses significantly 
>> > more
>> > fuel, not less as would be the case for a gas engine. (From a study
>> > looking
>> > at Diesel-alone vs. diesel-electric efficiency)
>> >
>> > -Jeff
>> >
>> > -----Original Message----- 
>> > From: c320-list-bounces at catalina320.com
>> > [mailto:c320-list-bounces at catalina320.com] On Behalf Of Stanley 
>> > Rogacevicz
>> > Sent: Monday, July 16, 2007 8:34 AM
>> > To: C320-List
>> > Subject: Re: [C320-list] Engine noise
>> >
>> > Jim,
>> > Again IF you have a PSS I'll just state Jon's post a bit differently -
>> > In
>> > following seas - I sometimes got a horrible sounding vibration from the
>> > PSS
>> > when really trying to make some time surfing the waves relieved by a
>> > throttle adjustment.
>> > Also if you are heading - into - big seas that are sending foam to your
>> > stern you can sometimes hear a different 'growling' sound as the Prop
>> > Cavitates - fixed, folding, whatever, PSS or not.
>> > Stan
>> >
>> >>>> 7/16/2007 8:19 AM >>>
>> > Jim,
>> >
>> > Could be cavitation from the prop, which can happen in rough seas or if
>> > the
>> > boat is outrunning the rpms. If you have a PSS, it can chatter when
>> > bouncing
>> > around sometimes. I've had this happen and have done what you 
>> > did...ease
>> > back the throttle, make sure everything else is okay and continue....
>> >
>> > Regards,
>> >
>> > Jon Vez
>> >
>> > -------------- Original message -------------- 
>> > From: "Jim DeLong"
>> >
>> >> Wondered if anyone else has experienced this engine noise?
>> >>
>> >> While in the ocean a couple of days ago, trying to outrun a squall, a
>> >> crew member cranked up the RPM's to 3000. More that I'm normally
>> > confortabe with.
>> >>
>> >> After 15 minutes or so, the normally smooth engine (Yanmar 27 HP)
>> >> began to sound like metal grinding. Pulled the RPM's bact to 2200 and 
>> >> all
>> > was well.
>> >> Cranked it up again and after 15 minutes it started again. No other
>> >> symptoms at all. Ran well but just sounded funky. In port yeaterday we
>> >> started the engine and ran it up to 3000. Could not get it to do it
>> >> again.
>> >>
>> >> Thought it may be from the transmission or a slipping shaft, but the
>> >> prop seemed to turn just fine.
>> >>
>> >> Anyone experience this one?
>> >>
>> >> Thanks,
>> >> Jim DeLong #453
>> >>
>> >>
>> >
>> >
>> >
>> >
>> >
>>
>>
>
>
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