My sense is that if you have the original mounts it's likely time to replace 
them. A pry bar under the engine near any of the mounts will give you an idea 
if the rubber and metal have separated. 

Rich

> On Dec 17, 2013, at 19:15, Eric Frank <[email protected]> wrote:
> 
> Is there a good way to test the quality of the engine mounts while Cat's Paw 
> is on the hard?  Last summer, I noticed that when the engine was at full 
> throttle (about 3000 rpm), water appeared in the bilge.  Watching the 
> dripless prop shaft seal while moving the throttle from mid-speed to full, I 
> noticed water was spraying out between the carbon piece at the forward end of 
> the bellows and the SS piece fixed to the shaft.  It seemed to me that the 
> forward end of the bellows was moving forward (have to trust my memory here), 
> and so the seal leaked.  Without analyzing this properly, I thought the 
> bellows needed to be replaced, which is true, and I ordered a new dripless 
> seal from PYI and am installing it.
> 
> But after a mention on this list about worn out engine mounts, I realize that 
> probably the prop shaft and engine were also moving forward because of the 
> strong thrust of the prop.  How else would the front of the bellows move 
> forward?
> 
> Is there a good way of testing the integrity of the engine mounts while the 
> boat is on the hard?  Obviously now is a good time to replace them if they 
> are worn out.  Is there a way of trying to push the engine forward to see if 
> I can reproduce what I think I saw?
> 
> Eric Frank
> Cat's Paw
> C&C 35 Mk II
> Mattapoisett, MA
> 
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