Since I have owned our Tashiba 40 the Maximum RPM, while in gear, on the
Yanmar 4JH-TE (turbo) engine has been at its specification of 3500. I
did play with the adjustable pitch MaxProp but ultimately found the
correct setting and maintained the correct max RPM of 3500 when the
throttle lever was full forward. Today while motoring in the harbor I
pushed the throttle to the maximum and the RPM's went all the way to
4000. It seemed like I could have kept going with the RPM increase but I
backed off immediately. I am aware that going over red line is not a
good thing to do.

So... the question is, why has the maximum RPM suddenly increased
dramatically when motoring in gear? My understanding was that setting
the pitch of the prop limits the RPM to what the engine is capable of
and no more. I wonder if the turbo never worked and now suddenly started
contributing boost to the engine resulting in an RPM increase.
Anyone have any ideas what might be going on with this?

By-the-way, I did not hear or feel the transmission come out of gear.
Can the transmission slip in gear without making any funny noises?

Rich Cassano
S/V Gray Eagle, Tashiba 40
Oyster Bay, NY USA

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Received on Thu Jun 29 12:42:12 2006