[C320-list] Knock, knock, who's there?

[James Sweet]

not yet

Sent from my iPad

> On May 14, 2015, at 7:02 PM, Jbrown5093 <jbrown5093 at yahoo.com> wrote:
> 
> Does it also happen in reverse when in a hard turn?
> Jim Brow
> 
> Sent from my iPhone
> 
>> On May 14, 2015, at 6:51 PM, Jim Sweet <jamesweet at frontiernet.net> wrote:
>> 
>> Bruce,
>> 
>> You have described , almost verbatim, a problem that we have had since late last year.  The only differences are that the knocking doesn't sound like it occurs with every turn of the shaft because it only seems to happen  at 1900-2000 rpm in a hard port turn.  The knocking  sounds like someone is tapping the hull with a rubber hammer possibly in the aft lazerette.  I had the boat pulled and the marina couldn't find anything and suggested that the very minor play in the rudder meant that the bearings needed replacing. Didn't feel right so I declined the service.  I have crawled around in the lazerettes and can't find anything loose and I plan on pulling EVERYTHING out of the storage areas to see if there is something loose.  I even checked the aft water tank to see if there was any play in that.  Someone suggested the transmission but I was below with She Who Must Be Obeyed driving to produce the noise and it didn't seem to be anywhere near the tranny or shaft coupling.  Even my gearhead friends are stumped.  If anyone finds a solution or what the problem is please post it.  Thanks.
>> 
>> Jim Sweet
>> TGIF (Thank God It Floats) 902
>> 
>> 
>> ----- Original Message ----- From: "B. Stumpp" <bstumpp at comcast.net>
>> To: <c320-list at lists.catalina320.com>
>> Sent: Sunday, May 10, 2015 4:40 PM
>> Subject: [C320-list] Knock, knock, who's there?
>> 
>> 
>>> We went out for our first Spring sail this afternoon.  Everything worked
>>> great BUT with the engine running and turning left I get a knocking sound
>>> with what seems like every revolution of the prop shaft.  It does not make
>>> the noise when going straight, turning right or in either direction in
>>> reverse.     If I speed up the engine the noise  goes faster.  I stuck my
>>> head in the engine compartment both in front of and behind the bulkhead,
>>> the sound is emanating farther back towards the stern.  It's not  a real
>>> loud knock but kind of like someone lightly tapping on the deck with a
>>> hammer as a surveyor does when checking for moisture.   Before we launched
>>> the cutlass bearing and strut all seemed fine.  Has anyone experienced this
>>> before?
>>> 
>>> 
>>> 
>>> Bruce Stumpp
>>> 
>>> Adventure, #647
>>> 
>>> Frog Mortar Creek, Maryland
>>