[C320-list] Engine Mounts

[Jeff Church]

Tom, Joe and A.R.

I started looking into engine mounts and drive couplers this winter. At 
Strictly Sail Chicago I spoke to the guys from Mack Boring. They are the 
local Yanmar distributors and claim to be one of the largest world-wide 
diesel distributors. They told me that the mounts are good for about 5 
years, sometimes less. After that the rubber has stretched and hardened. The 
result is noise and vibration being transmitted due to the hard rubber 
and/or the top and bottom plates coming into contact with each other as the 
engine torques. After speaking with Mack Boring I asked the local Catalina 
broker's rigger what his experience has been. He didn't think they would 
need to be replaced that often.

I took a look at my mounts (1998 #545 with 425 hours). The bottom of the 
stud that fastens through the top plate has less than 1/8" clearance from 
the bottom plate. As much as this engine bounces around under power, I tend 
to believe that the plates are coming into contact with each other. In the 
spring I'll try to get a look at a newer C320's engine mounts. Maybe someone 
with a new boat can check theirs out and let us know how much clearance 
there is between the top and bottom plates.

PYI sells an R&D brand engine mount and at the show they also had mounts 
that looked like the elastomer mounts made by Globe Rubberworks. The R&D 
mounts cost from $75 to $160. If I go through the trouble of replacing, I'll 
probably try to use one of these instead of the OEM mounts. Unfortunately, 
there seems to be a problem with bolt spacing. Our mounts have a spacing of 
roughly 6 13/16" rear and 7" front. Neither R&D nor Globe show that size on 
their web sites.

Another tip from Mack Boring. The foam pad in the air cleaner will start to 
deteriorate after a couple of years and should be replaced.

JeffC





----- Original Message ----- 
From: "Joseph A. Revak, DMD,MAS" <joenopain at verizon.net>
To: "A. R. Gates" <argates2nd at earthlink.net>; "C320-List" 
<C320-List at catalina320.com>
Sent: Friday, February 24, 2006 1:04 PM
Subject: Re: [C320-list] Engine Mounts


> Joe, here about 600, I think. Joe Revak
>
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