[C320-list] Engine noise

[Kirk McCullough]

I get a rattling sound occasionally, at normal cruise RPM's say 2500-2700 
with the Perkins. I have often wondered what it was and thought maybe it was 
the PSS seal chattering. I installed a new ZF 10 gearbox when the old Hurth 
50 packed it in this spring. I still get the rattling sound occassionally. 
Hmmm a mystery to me.

Kirk
Boomerang #124
----- Original Message ----- 
From: <jonvez at comcast.net>
To: "C320-List" <c320-list at catalina320.com>
Sent: Monday, July 16, 2007 5:19 AM
Subject: Re: [C320-list] Engine noise


> 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
>>
>>
>
>
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