Re: D3-110I-C Wandering RPM and Disk break

Rudolf Waldispuehl

Hi Dean

Nice to her that your gearbox installation went well. 

I never had any wandering RPM since owning WASABI (last 5 month of cruising).
But my shaft break gave up holding the disk above 6 knots of sailing speed. I turned the fastening screw on the cylinder both way. But tightening the brake pads to stop turning was not possible. 
If I’m correct I did the fastening according the instructions in the owners manual but no result. The Breck-Pads still have 4-5 mm on. 

Probably it’s the "pressure-cylinder mounting" who is weak. I doubt the mounting system is a very long lasting engineering solution? So I did an interims solution with some Tools on board and it works for the time being. @Dean, I’m curious how is your disk break system is installed. If possible I will have a look in Preveza. 

Best regards and cheers
WASABI A-54 #55 

Von: <amelyachtowners@...> on behalf of "trifin@... [amelyachtowners]" <amelyachtowners@...>
Antworten an: <amelyachtowners@...>
Datum: Mittwoch, 29. August 2018 um 17:27
An: <amelyachtowners@...>
Betreff: [Amel Yacht Owners] D3-110I-C Wandering RPM


Hi Gang,
I’ve been wondering for most of this summer about the wandering rpm in my D3-110-C motor. I’ve noticed that occasionally the rpm will wander around by 20-40rpm over a period of a second or so. It is obvious to the ear, as well as being shown in the instrument readout, and seems to be particularly prevalent when mooching around in the 1000-1500 rpm range. Haven’t noticed it so much at higher rpm.

I also don’t recall hearing it last year, but we were pretty overloaded with new stuff last year, it’s possible I just didn’t notice it.

Since I’ve now installed a new gearbox, I’ve kind of eliminated any issues on that front (ie pressure drops/shaft brake application)

This year I changed from the original fixed prop to an Autoprop, which is also a new piece of kit to me. Could this be related to the autoprop blades doing something erratic and momentarily loading up the motor?

Do others observe this behaviour? I guess with the trials and tribulations that Porter has gone through this year with his D3-110 we are all paying a bit more attention to this troublesome power plant.

Many thanks
SY Stella
Amel 54#154

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