[C320-list] Diesel vibration, 1999 Yanmar

[Jim Sweet]

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" <bhutt at windstream.net>
To: <C320-List at Catalina320.com>
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=
>