[C320-list] Main for Sale

[John Zienda]

Anyone interested to buy a used (2000 vintage) mainsail?  Good shape, no damages, recently cleaned and inspected by Sailcare. Full battens, with Dutchman system and a sail bag, sail cover. Free shipping within US and Canada.  Asking $500

John Zienda
#691 "Zooza" Chicago, IL
Cell (630) 408-3076

> On May 15, 2015, at 8:28 AM, John Meyers <jcmeyers7 at gmail.com> wrote:
> 
> Not sure what Brahmany will say, but from this array of discussions I
> wondered what my shaft was doing. I had not notice any vibration or had any
> adjustments made. So right after I launched  a couple weeks ago this year I
> put the boat in the slip and put it in forward at about 1500 rpm. I laid a
> wrench (could have use a screw driver too) on top of the spinning shaft and
> there was some (minor?) vibration. When I held the wrench on the side of
> the shaft there was no vibration compared to the top. So I assume that
> there is some misalignment in one direction. Now I know that just after
> launch the boat needs to settle in and come back to floating shape. So
> hopefully this weekend when I go back out all vibration will be gone.  My
> cutlass bearing appears to be still in good shape.
> 
> John Meyers
> Wind Chime #406
> Muskegon, MI
> 
> 
> 
>> On Fri, May 15, 2015 at 8:36 AM, Marek Fluder <marekf at gmail.com> wrote:
>> 
>> Brahmany,
>> Can you elaborate on the "screwdriver trick"?
>> Sounds like some interesting diagnostic.
>> 
>> Marek
>> #1028
>> 
>> On Thu, May 14, 2015 at 5:49 PM, Brahmany Kite <brahmanykite at gmail.com>
>> wrote:
>> 
>>> The shaft contacting the stern tube is a source of vibration also as
>> there
>>> is not much clearance. Especially if there is misalihnment. On one boat i
>>> found the gland body pushed too far on astern through the hose and
>> bumping
>>> on the inboard end of the stern tube. Yanmar mounts are soft as you know
>>> and small clearances dont help. Under load the engine will twist slightly
>>> sometimes allowing shaft contact as well. The old screwdriver end held to
>>> the ear trick will help find the source. Just a thought.
>>>> On 14/05/2015 10:28 PM, "Graeme Clark" <cg at skyflyer.co.uk> wrote:
>>>> 
>>>> Jeff
>>>> 
>>>> New mounts fitted as the  rear starboard original had become disbonded
>>> due
>>>> to a diesel leak onto the rubber. They were 18 years old original to
>> the
>>>> boat, anyway!  All the correct spec mounts in the correct place!
>>>> 
>>>> BUT -  they aren't Yanmar mounts. They are made by a  company called
>> R&D
>>>> as a direct replacement and I chose them because the design protects
>>>> against a  similar problem as they are shielded and the rubber is
>>> inserted
>>>> into the mount not bonded to it.
>>>> 
>>>> There is a page on the Yanmar site about using non-Yanmar mounts and it
>>>> does mention that “other makes’ can be stiffer which increase vibration
>>> at
>>>> lower rpms.
>>>> 
>>>> The tacho is spot on, calibration, (I have a laser tachometer that I
>> used
>>>> on the crank pulley to check). So at 1000 rpm its in fine form, at 800
>>> its
>>>> shuddering away!
>>>> 
>>>> One thing someone else suggested was to check that with higher
>> amplitude
>>>> vibrations it is possible that some part of the engine actually touches
>>> the
>>>> boat; I’ll have to check next time I am on board.
>>>> 
>>>> So really my question is whether it is normal for the engine to shake
>>>> around a lot at low revs, rather than for the boat itself to shudder.
>>>> 
>>>> The other thing I am unsure of is how the governor works - mine
>> maintains
>>>> a set RPM when the boat is out of gear or if the boat is in gear, but
>>> when
>>>> you transfer from neutral to forward gear, obviously the engine comes
>>> under
>>>> load, and the rpm drops requiring more throttle.
>>>> 
>>>> I don't know if this is expected behaviour or not?
>>>> 
>>>> Thanks
>>>> 
>>>> Graeme
>>>> 
>>>> 
>>>> 
>>>> 
>>>> On 13 May 2015, at 23:24, Graeme Clark <cg at skyflyer.co.uk> wrote:
>>>> 
>>>>>> Hi,
>>>>> 
>>>>> It depends.  Do you feel boat vibration, or are you just seeing the
>>>> engine
>>>>> "rocking" in its mounts?  If you feel the boat shuddering, then this
>> is
>>>> not
>>>>> normal, and *usually* indicates that the idle is too low.  If the
>>> engine
>>>>> "looks" like it's vibrating a lot in its mounts, that's probably ok
>> as
>>>> long
>>>>> as the prop shaft isn't bouncing all over. Some shaft movement is to
>> be
>>>>> expected at idle however.
>>>>> 
>>>>> The engine is supposed to oscillate (rotate/rock side to side) in
>> line
>>>> with
>>>>> the prop shaft.  (imagine the prop shaft extending through the engine
>>> and
>>>>> out the front and attached to fixed mounts at both ends. The engine
>>> will
>>>>> pivot side to side around this shaft, more so when at a low idle, and
>>>> when
>>>>> revved up, it should appear to be much more stationary).  The Yanmar
>>>> rocks
>>>>> quite a bit at idle, but gets more smooth as you increase the speed.
>>>>> 
>>>>> So, if the tach reads 1000 and you feel the boat shuddering, the idle
>>> is
>>>> too
>>>>> low and your tachometer is probably reading a little high.  Increase
>>> the
>>>>> idle by adjusting the governor (on the cable right below the engine
>>>> mounted
>>>>> fuel filter).  If the tach is correct and it only smooths out (stops
>>>>> shuddering) at higher RPM, your engine mounts may be shot.  Another
>>>> thing to
>>>>> notice is if you rapidly back the throttle down to idle position and
>>> the
>>>>> engine shudders or nearly stalls then again, your idle setting is too
>>>> low.
>>>>> 
>>>>> Cheers!
>>>>> -Jeff Hare
>>>>> #809
>>