On the 362 I am looking at between 1,200 and 1,500 rpm’s there is a noticeable vibration while in gear. Below and above these rpms it is very smooth. The engine is a 35B which is a three cylinder Westerbeake. This does not have the cv joint that my 38 MKII had. The cutlass bearing is tight and the prop is a 3 bade martec. My previous three boats had diesel engines and accept at a low rpm were very smooth through to the max recommended rpm. Am I missing some thing ?
- vibration can be a tricky thing - you might be getting a resonant frequency. Finding and fixing that can be a nightmare and it may be easier to adjust your RPMs. On my 28, I find a resonant frequency at about 1/4 throttle (atomic 4 engine - I don't know the RPMs as hull #11 wasn't delivered with a tachometer). The vibration is generally found in the stove cover - just very loud.This throttle setting results in about 3 knots in still water and I generally make a small adjustment (either higher or lower) and eliminate the vibration that way. Could I chase down the issue and fix it? Probably, but there are other things that I would rather work on.my $.02.J. Scott ClintonHull #11.On Sep 6, 2007, at 12:42 PM, Kirk Glenn, CPA wrote: