The exhaust elbow at the engine, it can get constricted - like an
artery. Which restricts the ability of exhaust gas to get out, thereby
cutting your RPM.
Graham Collins
Secret Plans
C&C 35-III #11
jackson maddux wrote:
Kim, could you please elaborate on item #4, the mixing elbow? Where do
I look for it on the engine?
thanks,
-Jackson
On Mon, Aug 20, 2012 at 12:54 PM, Kim Brown <kimcbr...@comcast.net
<mailto:kimcbr...@comcast.net>> wrote:
Jackson
FWIW
1) I would start with the prop and bottom - be sure it is clean. it is
amazing how a few barnacles on the prop can kill speed (and RPMs) and
unbalance things. (what kind of prop?- if folding-one blade not
opening
right due to crud would really throw stuff out) BTW can you get it to
3200RPM in neutral? that would rule out the linkage issue and
suggest it is
a load issue.
2. new filters- air and fuel. Could check the air filter by just
removing it
and seeing if you get RPMs back. Also look for black powder on
filter and in
engine compartment (belt wear from loose alternator belt) The 2gm
uses so
little fuel that it is hard to imagine a fuel filter clogging
enough to
limit flow but in either case a visual inspection should show
issues. Water
in fuel filter bowl?
3) Symptoms sound like Belt is too loose. (burnt belt smell and
light that
goes out with higher revs. Think is this is a separate issue from
RPMs.
Guess the bearing in alternator could be starting to go bad but I am
guessing just a loose belt.- probably time to replace both anyway?
4) Based on having both a 2GMF and 3GM20F over the years I have
come to
always suspect the mixing-exhaust elbow when power and RPMs are
down. If
you haven't replaced it in a number of years-just do it. It is a
PIA to do
and remember to get the close nipple too and Yanmar has changed
the water
entry over the years so you may have to salvage a piece off the
old one or
otherwise get creative.
Good luck
Kim
Trust Me!!! 35-3
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