[C320-list] Engine noise

[Stanley Rogacevicz]

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

>>> <jonvez at comcast.net> 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" <jdelong3 at neo.rr.com> 

> 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 
> 
>