Re: [Amel Yacht Owners] Seeking Volvo TMD22 and Brunton Autoprop information and advice

Ann-Sofie Svanberg <kanalmamman@...>

You have a couple of possible problems:
- are the bearings on the Autoprop been changed since the boat was delivered from Amel? Malfunction from the bearings cause a lot less effective propeller
- are the blades moving without force
- are there any barnacles on the blades, they create cavitation that reduces the propellors efficiency
- check that the fuel valve from the diesel tank is Fully open, if it is partly open the VP can not reach full rpm due to lack of fuel.

We have had similar problems and especially the change of bearings created a significant change both in speed and fuel economy. You have most likely a Autoprop H6 with open bearings. On the propeller where the blades are attached you could find the serial number of the propeller that will give you correct bearing set from Brunton.

Best regards,

SM 232 Lady Annila

Skickat från min iPad

14 feb 2014 kl. 11:40 skrev atioceania@...:


Hi. We have a 1997 SM, hull 202, with a Volvo TMD22B and Brunton Autoprop that under load will only reach 2300 RPM at best and suboptimal boat speed. The Volvo readily spins up to higher RPMs in neutral with just a bit of white smoke, "sounds good" and doesn't burn any oil; while under load, we reach 2300 at half throttle and then can go no higher no matter how much more fuel we add. A couple of non-Amel mechanics suggest the Autoprop is the trouble, although it seems to fold fine manually when I dive it, and we see no significant difference between it being just cleaned or not.

Does anyone have pitch and setting recommendations for this prop, which I think is an H6, with the Volvo engine on an SM, or any thoughts and advice? Also, who might we talk to to service the prop? We are currently in St Pete FL, with hopes to solve the power problem and be cruising south in the very near future.
Thank you.
Scott and DIane

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