[C320-list] Black Carbon Smoot

[Paul Rickman]

Hi Joe,
 
I'd start with the rubber exhaust hose coming of the exhaust elbow going down to the muffler.. If not then perhaps
the exhaust elbow itself. It is probably wrapped with some heat resistant material, take that off and look for rust-through. You may also see some tail tail signs of water dripping from the elbow. If so, good chance there is a hole in the elbow. If it is a Catalina
part, stainless, then you may be able to get a weld. If not, order it from Catalina. In my case I had to send it the old
part in to them to make an exact duplicate. If it is a Yanmar part, order a new one. The elbow is attached to the exhaust
manifold on the back of the motor. Best of luck.
 
Paul
Affinity 657
Bay Bridge Marina



----- Original Message ----
From: Joe Barrett <joe at dolphinmortgage.com>
To: C320-List at Catalina320.com
Sent: Tuesday, August 5, 2008 1:29:34 PM
Subject: [C320-list] Black Carbon Smoot


I have fixed my engine starting problem. Turns out all the switches inside
the Navpod were corroded and needed to be replaced including the Bus Bar
terminal. Water intrusion was the cause.

Never ends though as I was motoring out for a Sail Sunday and a passenger
went below and said is there supposed to be black smoke coming from the
engine? I shut the engine off, went below and the entire engine compartment
was filled with black carbon smoot. I have no idea where it came from or
where to look for a cause. The engine is the 3GM30F Yanmar and my boat is a
2000 model bought new in September 2001. A crewmember started the engine
while I looked from the Aft cabin and it appeared to be coming off the top
of the engine.
Any thoughts? I usually run a bit higher RPM's than some on this list not
hesitating to run at 3200 RPM for long periods so I never thought about
buildup due to running long periods at low RPM's.
Please HELP!
Joe Barrett
Island Time #689
Naples, Florida