[C320-list] Engine / shaft alignment

[Jeff Church]

That's correct. Once loosened you can tap the bottom portion of the mount 
with a small hammer or similar object and it will move. As the bottom moves, 
the top will twist and you will need to re-align it with the bottom by 
tapping or prying.


----- Original Message ----- 
From: "Scott Thompson" <sthompson at toad.net>
To: "C320-List" <C320-List at catalina320.com>
Sent: Monday, May 22, 2006 11:25 AM
Subject: Re: [C320-list] Engine / shaft alignment


> So is the idea that I rotate the mounts themselves a bit?  I imagine I 
> have to loosen the top nuts on each mount so that the mounts can rotate 
> underneath.
>
> Jeff Church wrote:
>> Scott,
>>
>> Take a closer look at the lower portion of the motor mount where it bolts 
>> into the engine bunk. The aft holes on the aft mounts and the forward 
>> holes on the forward mounts are elongated so that the engine can be 
>> angled or shifted laterally.
>>
>> JeffC
>>
>>
>> ----- Original Message ----- From: "Scott Thompson" <sthompson at toad.net>
>> To: "C320-List" <C320-List at catalina320.com>
>> Sent: Saturday, May 20, 2006 8:36 PM
>> Subject: [C320-list] Engine / shaft alignment
>>
>>
>>> Surprise now has a Gori 2 blade folding prop to replace the 3 blade 
>>> fixed. So far I'm satisfied, except that there is definitely quite a bit 
>>> more vibration under power than before.  Today I tried to tackle this by 
>>> doing a shaft alignment.  This is a job I've ignored since owning the 
>>> boat and have been rather nervous about that situation.  When I unbolted 
>>> the flanges I found that the engine flange did not line up well with the 
>>> shaft, and was a bit higher.  I was able to get the alignment much 
>>> better in the fore-aft plane using the adjustment advice in my owners 
>>> manual, but was left with somewhat excessive side to side misalignment. 
>>> To be precise, the two flanges have good axial alignment and are even 
>>> top to bottom, but there is a bit of a gap (about .014 inches by my 
>>> feeler gauge on the starboard side.  I can't figure out how to tune this 
>>> out.  It would seem to require moving the front of the engine slightly 
>>> to starboard, but I don't see any way to adjust the engine mounts 
>>> laterally.  How is this supposed to be done?  I have the Yanmar 3GM30F, 
>>> 1999 model.
>>>
>>> Scott Thompson
>>> Surprise, 653
>>>
>>>
>>
>
>