I have a Yanmar 2G Diesel (1985 year) in my S2 9.2 sailboat and it has operated without problems for 30 years (we have a 3 month sailing season).
Over the past several years, this engine seems to have developed a problem. The problem occurs when I put it in gear vs when I'm in neutral. When I go from idle and increase the throttle (when in gear), the motor shakes like crazy (I mean to say, it shakes the whole boat as if it is coming off of it's mounts!) It does not shake when I run up from idle in neutral.
At first, I blamed the folding prop but that doesn't seem like it would be a problem since the prop is geared so that both blades need to come "out" equally. And, I notice that if I increase throttle speed very slowly, it will go up in rpm without excessive vibration. Or, if it vibrates and I change the rpm a bit, it seems to "smooth out" and the vibration - eventually - disappears.
What to do? Someone suggested that my idle speed is set too low. Can it be as simple as that?
Don Voigt, Port Washington, WI
Over the past several years, this engine seems to have developed a problem. The problem occurs when I put it in gear vs when I'm in neutral. When I go from idle and increase the throttle (when in gear), the motor shakes like crazy (I mean to say, it shakes the whole boat as if it is coming off of it's mounts!) It does not shake when I run up from idle in neutral.
At first, I blamed the folding prop but that doesn't seem like it would be a problem since the prop is geared so that both blades need to come "out" equally. And, I notice that if I increase throttle speed very slowly, it will go up in rpm without excessive vibration. Or, if it vibrates and I change the rpm a bit, it seems to "smooth out" and the vibration - eventually - disappears.
What to do? Someone suggested that my idle speed is set too low. Can it be as simple as that?
Don Voigt, Port Washington, WI