Re: [Amel Yacht Owners] Rough engine at idle


eric freedman
 

Miles,

If you have a vetus coupling. I think the knocking sound could be caused by the breakdown of the bushings in the coupling. The engine mounts and the C-Drive mounts are  also something to check.

Fair Winds

Eric

Kimberlite Amel Super Maramu #376

 

 

 

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Wednesday, January 02, 2019 8:52 PM
To: amelyachtowners@...
Subject: RE: [Amel Yacht Owners] Rough engine at idle

 

 

First easy check is the engine mounts. We had your symptoms at certain harmonic rpms.

Standing next to the ending rock it vigorously athwartships. If you can recreate the knocking sound, it is likely one of the mounts.

Mike Ondra

Aletes SM#240

St. Augustine FL

 

From: amelyachtowners@...
Sent: Wednesday, January 2, 2019 11:58 AM
To: amelyachtowners@...
Subject: [Amel Yacht Owners] Rough engine at idle

 

 

Hello fellow amelians
In the canaries our engine purred nicely
When we arrived in the Cape Verde’s it was a little rough on idle
On first running since the roughish Atlantic crossing (40-45kts during last 5 days) its even rougher still
I have a Perkins m65 with around 3k hours
It starts on the button but vibrates lots until the revs are increased.
Would be great to hear thoughts on any simple things I could try. I don’t think I can adjust the idle speed on the engine. Perhaps I could via the throttle cable but don’t want to make matters worse.
I’ve bled the fuel

I’m currently in Barbados where I can’t seem to find a diesel mechanic
Next stop Martinique where I’m sure I’ll find good professional
We ran the prop shaft alternator on the long crossing for 2 weeks straight. I started to notice that in the higher winds towards the end of the trip the noise from the rotating prop would change to a less regular sound at speed - almost a knocking sound
I think perhaps the prop shaft alignment needs adjusting. Perhaps the two issues are related although if so I’d imagine the vibrations to get worse with increased revs rather than get better

Any thoughts most appreciated and any pointers to good mechanics in Martinique would be great too

All the very best

Miles

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