Check your exhaust hose. I had the same unidentified klunk. Turned out it was
the exhaust hose hitting the transom every belch of water. Doug Mountjoysv
Rebecca Leah C&C Landfall 39Port Orchard yacht club
-------- Original message --------From: Bruce Whitmore via CnC-List
<[email protected]> Date: 7/29/20 15:13 (GMT-08:00) To: C&C List
<[email protected]> Cc: Bruce Whitmore <[email protected]> Subject:
Stus-List Unidentified clunk when motoring - 1995 C&C 37/40+ Hello all,While we
were moving our boat to the yard to get it repaired (see my previous post about
a jetski hitting us), we motored about 12 miles. For reasons I can get into
later, we were going only about 4 knots. We were in the Gulf of Mexico and the
going up Tampa Bay in light conditions with relatively minimal seas. About
every 30 or 45 seconds, without any particular connection to waves, we got a
quiet but discernible "thump" or "thunk" that I could feel through my feet. It
seemed to be most noticeable when I propped my foot on the starboard stern
locker. That is the propane locker. I looked in there, and did not see the
tank rocking or other reason for the noise. It did not seem to be linked to
waves, as we hit multiple rocking boat wakes and other wave forms, so I saw no
consistency there. Nor did I see any link to revving the engine, shifting in &
out of gear, etc. There was no indication of a crab pot bouy or anything else,
either, but I haven't been under the boat. Any idea what might be causing the
noise?Would a failing motor mount cause this, and how would I diagnose
it?Thanks for your insights,Bruce Whitmore1994 C&C 37/40+ "Astralis"Madeira
Beach, FL (847) 404-5092 (mobile)[email protected]
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