[C320-list] Diesel vibration, 1999 Yanmar

[Elizabeth Schwartz]

Ahoy.....I have #245, with a Westerbeke. It has a sound similar to what 
you describe. I think it has something to do with the exhaust coming out 
of the port side. With a little back pressure, ie higher water on the 
inside turn to port, the exhaust hose thumps on hull in the lazzarette. 
 Try a few more clamps on the hose in a few spaced out 
locations......I'm thinking of trying it.   Joe 
On Wed, Jun 18, 2014 at 07:58 PM, Jim Sweet wrote:

> I don't want to hijack this thread but I have a somewhat related issue 
> that I can't seem to get started as a new thread.  When we hit 2000rpm 
> there is a "thumping" noise that sounds like something is wrapped 
> around the shaft and hitting the hull aft of the strut.  It is 
> rhythmic but at a much slower tempo than the shaft is spinning.  When 
> you take a hard port turn it increases in speed.  Nothing on the 
> starboard turn.  They have pulled the boat and there is nothing on the 
> shaft, the shaft is straight and aligned, the strut is fine and the 
> cutlass bearing is ok.  I have taken everything out of the lazzerettes 
> and found nothing.  The yard can only come up with a 1/4" play in the 
> bottom rudder bearing so they think that is the issue.  The "cure" is 
> don't do 2000 rpm or turn up the stereo.  Anybody have any issues with 
> the rudder bearings, strange noises or a haunted boat?  Thanks.
>
> Jim Sweet
> TGIF (Thank God It Floats) 901
> ----- Original Message ----- From: "Bill Hutt" To: Sent: Tuesday, June 
> 17, 2014 9:09 PM
> Subject: Re: [C320-list] Diesel vibration, 1999 Yanmar
>
>
>> I'll try to raise the idle a tad and see if that helps. Thanks,
>>
>> Bill
>>
>> -----Original Message----- From: Jeff Hare Sent: Tuesday, June 17, 
>> 2014 3:55 PM To: C320-List at Catalina320.com Subject: Re: [C320-list] 
>> Diesel vibration, 1999 Yanmar
>> Hi Bill,
>>
>> Ours does this if our Idle was set a bit too low.  If you pull the 
>> front
>> engine cover, on the Left side, is the governor cable (throttle) 
>> that's
>> connected to a little brass block.  There's a stop screw that 
>> controls how
>> low the idle can go.  Give it a few turns so that the idle is just a 
>> tad
>> higher.  With a little trial & error, we got it set so that we can 
>> throttle
>> down fast and it won't shudder, but still low enough for an idle and 
>> gentle
>> shifting.
>>
>> -Jeff
>>
>> -----Original Message-----
>> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On 
>> Behalf
>> Of Bill Hutt
>> Sent: Tuesday, June 17, 2014 8:16 AM
>> To: C320-List at Catalina320.com
>> Subject: [C320-list] Diesel vibration, 1999 Yanmar
>>
>> Group,
>>
>> While we're on the subject, when I quickly rev down the engine (as 
>> when
>> docking) I get a terrible shudder. If I rev down slowly, no issues.
>> When I first got the boat the mechanic said no big deal. Other than 
>> that
>> engine seems to run fine.
>> Any ideas/ suggestions?
>> Thanks,
>> Bill Hutt
>> Caribbean Soul
>> Cleveland, Ohio
>>
>> Sent from my iPad=
>>
>
>
>