Big 4 cyl engines are known for heavy idle. The automakers have known
for a long time the max size for acceptable idle smoothness is about
2.5 L. Above that, the shake from the power pulses is very large. You
can help it some by raising the idle speed to 900 RPM or so. The
engine's ECM may not allow this, and there is probably no actual
mechanical adjustment. See what the dealers lies suggest.
JR

wrote:
I have a new 2007 Bayliner 185, with a Merc 3.0L 4Cyl engine, and an
Alpha 1 outdrive.

My issue (my dealer's issue to be more accurate) is this:

At idle, warm or cold, the engine vibrates horrendously, to the point
where it resonates (shudders) throughout the entire boat, shaking the
gunwales. The idle is currently at about 600 RPM. I have also
noticed that when I took the boat out of the water, the transom has
some black film on it. At speed, basically anything above 1100 RPM,
the engine performs perfectly. The boat has about 3 hours on it at
this point. It is going back to the dealer tomorrow for this issue,
but I was wondering if anyone else had run into a similar problem?

Other than this, I have been pretty happy with the boat. It planes up
in seconds, delivers the promised 42 MPH (on GPS) and is very stable,
even on the choppy early spring waters of Lake Erie.

Thanks,

Randy.

.



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