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post #1 of Old 02-28-2011 Thread Starter
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Weird 'severe' vibration

I just bought the 1979 Islander 30 with the Volvo 13hp.
the engine purrs in neutral and can rev it up with no vibration at all - smooth as my F-150, ha.

The previous owner recommended me to 'loosen' the 'knuckle' to allow water to drip. - Inboard engines and this technique is greek to me - I assume to 'cool' the shaft? I do not know. Any suggestions on readings?

Well I did this under his observation and it drips 1 drop about every 2-3 seconds. Now I have this HORRIBLE vibration when in gear - it rattles the whole boat when just above idle speed. Very severe vibrations.

I went back and tightened the 'knuckle' back up to 1 drop per 5-10 seconds ( which was a minute adjustment - I mean maybe .5 degree turn.

Now the engine purrs in gear and I can really get some speed.

So, was this the fix? Or have I lost my mind?
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