Date   

Re: Amel Santorin Propeller Question

Azimuth
 

Update: changed the gearbox oil as a precaution even though it was just changed 1 month ago in Le Marin. Less than a liter drained out. Also, it had a strange, coppery look to it. Ran engine oil through a couple of times and topped it up. Will need to test against wind and waves but hoping this resolves the issue.

Lisa Tharpe
S/V Azimuth
Amel Santorin #143


Re: [Amel Yacht Owners] hatch gaskets

Porter McRoberts
 

They are low profile.  I ordered replacement gaskets from lewmar.  The one for the salon worked great.  The forward hatches were too thick.  So… I removed the gaskets.  scrubbed all the crud off, cleaned every little groove with a toothbrush, cut out about 0.25cm around the weld, and re-welded with “Max 1 Glue, LLC” out of Punta Gorda, FL.  (simply amazing stuff) and then relubed with fresh silicone grease (Thanks Bill Rouse) and re-installed.  Perfect.  A note- you have to drill out the extra hatch-cover rivet to remove the cover from the base.  They I guess were riveted by Amel, make sure to 5200 to re-seal.  

Hope this helps

Porter

Porter McRoberts
S/V Ibis: Amel 54-#152
Ft. Lauderdale
www.fouribis.com
portermcroberts@...







On Dec 17, 2017, at 8:15 AM, jmkraus@... [amelyachtowners] <amelyachtowners@...> wrote:


Good Morning Amelians,

I need to change the gaskets on the forward hatches. 

I did the saloon hatch a couple years ago, and seem to remember the gasket was a 1 piece gasket that I got from lewmar. 

I believe the OD dimensions on the 2 hatches are 22.5" by 22.5" and 20.5" by 22.5" . 

They are lewmar low profile hatches, but I'm not sure of the model #.

If anyone has the kit # or model # to help me order the gaskets, I would be greatly appreciative.

Jeff

Spirit Amel 54 #14




Re: [Amel Yacht Owners] Re: Amel Santorin Propeller Question

Mark Erdos
 

Your transmission could be different from mine. I have a Hurth ZF25 transmission. If you have the same you can only use automatic transmission fluid (ATF) Type A.

 

The fluid should be checked when cold.

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Martinique

www.creampuff.us

 

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Sunday, December 17, 2017 11:03 AM
To: amelyachtowners@...
Subject: [Amel Yacht Owners] Re: Amel Santorin Propeller Question

 

 

Thanks so much for all of the responses.  We are checking the transmission and gearbox now.  Question:  when do you normally check the gearbox oil - while the engine is running and/or warm, or when it is cold? Also, do you use the same oil as for the engine (15 W 40)? The mechanic in Le Marin, Martinique changed the gearbox oil and used the same oil, so just wondering. 

 

By the way, the engine is a Volvo Penta MD22L 50 HP, not the original Perkins Prima.

 

Thanks!

 

Lisa


Re: Amel Santorin Propeller Question

Azimuth
 

Thanks so much for all of the responses.  We are checking the transmission and gearbox now.  Question:  when do you normally check the gearbox oil - while the engine is running and/or warm, or when it is cold? Also, do you use the same oil as for the engine (15 W 40)? The mechanic in Le Marin, Martinique changed the gearbox oil and used the same oil, so just wondering. 

By the way, the engine is a Volvo Penta MD22L 50 HP, not the original Perkins Prima.

Thanks!

Lisa


Re: [Amel Yacht Owners] Seafood Party in Martinique

Leopold Hauer
 

O sorry!

Von meinem iPad gesendet

Am 17.12.2017 um 13:08 schrieb JEFFREY KRAUS jmkraus@... [amelyachtowners] <amelyachtowners@...>:

 

Leo,
I was referring to the Jean Collins, his workers, Geatan, Phillipe, ets...


On Sun, Dec 17, 2017 at 08:57 AM, Leo Hauer leopold.hauer@... [amelyachtowners] wrote:

 

HelloJef,
What a wonderful thing! In fact we leave Mindelo tomorrow and will be in Le Marin probably in 2 weeks, our place in the marina is reserved from jan.6

We will love it to meet other Amelians there and we hope it will be ok although we could not help to upgrade your boat.

Sincerely,

Leo and Margaret from Austria
Yin Yang
SM 69

Von meinem iPad gesendet

Am 17.12.2017 um 12:37 schrieb jmkraus@... [amelyachtowners] <amelyachtowners@...>:

 

Good Morning Amelians,
I just returned from Martinique, and plan to return before 1/2. 
I'm going to bring some oysters and scallops with me (which I grow and catch respectively), and hope to set up a little party. 
I'd like to get the Amel people that have been helping us get our boats upgraded together with whoever is around and have some laughs and fun. If there are oysters, wine and scallops there, what Frenchman can refuse that?
I'll look to set up the soiree when I return, but I'm talking early to mid January. Hopefully at the Kokoarum (sp) joint right there.
If any Amelians are around, they will be welcome.
Jeff 
Spirit Amel 54 #14



Re: [Amel Yacht Owners] Seafood Party in Martinique

JEFFREY KRAUS
 


Re: [Amel Yacht Owners] Seafood Party in Martinique

Leopold Hauer
 

HelloJef,
What a wonderful thing! In fact we leave Mindelo tomorrow and will be in Le Marin probably in 2 weeks, our place in the marina is reserved from jan.6

We will love it to meet other Amelians there and we hope it will be ok although we could not help to upgrade your boat.

Sincerely,

Leo and Margaret from Austria
Yin Yang
SM 69

Von meinem iPad gesendet

Am 17.12.2017 um 12:37 schrieb jmkraus@... [amelyachtowners] <amelyachtowners@...>:

 

Good Morning Amelians,
I just returned from Martinique, and plan to return before 1/2. 
I'm going to bring some oysters and scallops with me (which I grow and catch respectively), and hope to set up a little party. 
I'd like to get the Amel people that have been helping us get our boats upgraded together with whoever is around and have some laughs and fun. If there are oysters, wine and scallops there, what Frenchman can refuse that?
I'll look to set up the soiree when I return, but I'm talking early to mid January. Hopefully at the Kokoarum (sp) joint right there.
If any Amelians are around, they will be welcome.
Jeff 
Spirit Amel 54 #14



Re: [Amel Yacht Owners] Seafood Party in Martinique

Mark Erdos
 

Hi Jeff,

 

We’re game – It’ll be a long walk for us to get there but I think it’ll be worth it.

 

We’ll keep an eye on Spirit while you are away. Please let us know if you need anything.

 

Thanks for the bag of food. I’m assuming you where the food fairy that left us some goodies in the early dawn. The OJ was a nice treat!

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Martinique

www.creampuff.us

 

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Sunday, December 17, 2017 9:37 AM
To: amelyachtowners@...
Subject: [Amel Yacht Owners] Seafood Party in Martinique

 

 

Good Morning Amelians,

I just returned from Martinique, and plan to return before 1/2. 

I'm going to bring some oysters and scallops with me (which I grow and catch respectively), and hope to set up a little party. 

I'd like to get the Amel people that have been helping us get our boats upgraded together with whoever is around and have some laughs and fun. If there are oysters, wine and scallops there, what Frenchman can refuse that?

I'll look to set up the soiree when I return, but I'm talking early to mid January. Hopefully at the Kokoarum (sp) joint right there.

If any Amelians are around, they will be welcome.

Jeff 

Spirit Amel 54 #14

 

 


Seafood Party in Martinique

JEFFREY KRAUS
 

Good Morning Amelians,
I just returned from Martinique, and plan to return before 1/2. 
I'm going to bring some oysters and scallops with me (which I grow and catch respectively), and hope to set up a little party. 
I'd like to get the Amel people that have been helping us get our boats upgraded together with whoever is around and have some laughs and fun. If there are oysters, wine and scallops there, what Frenchman can refuse that?
I'll look to set up the soiree when I return, but I'm talking early to mid January. Hopefully at the Kokoarum (sp) joint right there.
If any Amelians are around, they will be welcome.
Jeff 
Spirit Amel 54 #14



Re: [Amel Yacht Owners] hatch gaskets

Peter Forbes
 

Yes Jeff I would like to know that too. Also I need to replace the compact of the blind/ mosquito screen on all these hatches - I think Lewmar won’t any longer supply so how does one get those replacements?

Peter
Peter
Carango 
Amel 54 #035
Marigot Bay

Peter Forbes
00447836 209730

On 17 Dec 2017, at 13:15, jmkraus@... [amelyachtowners] <amelyachtowners@...> wrote:

 

Good Morning Amelians,

I need to change the gaskets on the forward hatches. 

I did the saloon hatch a couple years ago, and seem to remember the gasket was a 1 piece gasket that I got from lewmar. 

I believe the OD dimensions on the 2 hatches are 22.5" by 22.5" and 20.5" by 22.5" . 

They are lewmar low profile hatches, but I'm not sure of the model #.

If anyone has the kit # or model # to help me order the gaskets, I would be greatly appreciative.

Jeff

Spirit Amel 54 #14


Re: [Amel Yacht Owners] Onan genset trouble code "seven blinks"

Thomas Peacock
 

We have had similar, recurrent problems on our SM #240. For some reason, the impellers we buy for the Onan have a tendency to lose blades, which then get trapped. By comparison, we have not noted that with the Volvo drive engine. 

One thing I have noticed: even when the engines (either Onan or Volvo) are not putting out sufficient water, there is a “throaty” exhaust sound. 

Even better, which I don’t think I can pass on, is what happened when I had an expert on board to look at a water flow issue. He put his hand on the side of the Onan, just downstream of the impeller, felt the surface for a couple of seconds, and diagnosed the problem immediately.

But you’re right, the fix is well within anyone’s skills who follows this Amel site.

Tom Peacock
SM #240 Aletes
Falmouth Harbour, Antigua

On Dec 16, 2017, at 9:21 PM, john.biohead@... [amelyachtowners] <amelyachtowners@...> wrote:


Hi All,

  I case anyone has not seen this before.  Started the Onan 7KW generator after a passage and it turned off shortly after starting.  It gave the seven blinking light trouble code.  My manual indicates this is the “no sea water flow” shutdown.   Don't force the generator to run if you get this code and there is no sea water coming out of the exhaust, like the situation we were in tonight.

 

Checked the obvious sea strainer all good, then broke out tools  to open up the sea water pump and discovered only two vanes left on the impeller.  Installed the onboard ready spare (you should have at least one spare all the time)  but on restart continued to get the no flow shutdown.  Pump was full of water and all vanes aligned correctly.  Checked down stream and found the heat exchanger inlet plugged with …..you guessed it, impeller vanes.   After clearing all the debris and repriming the sea water system the genset is back on line. 

Note, all these steps were rather simple, just a bit tedious.  The pump was easy to open, impeller pulled right out.  New one was a bit of a four letter pushing match to get into the housing but eventually my thumbs won.  The heat exchanger had one bolt to remove the end cap and then used tweezers to pull out the bits of impeller plugging the heat exchanger.    Will post pictures on the FB page. 

 

Take home message, onboard spares, and “yes you can do it yourself with a little patience and common sense.  This repair cost us one impeller, ($30USD)  and 1.5hr labor.  How much would an Onan technician charge us for this repair?  

 

                   Regards,  John

 

John Clark

SV Annie  SM 37


Just moored at St.  Augustine for Christmas





hatch gaskets

JEFFREY KRAUS
 

Good Morning Amelians,

I need to change the gaskets on the forward hatches. 

I did the saloon hatch a couple years ago, and seem to remember the gasket was a 1 piece gasket that I got from lewmar. 

I believe the OD dimensions on the 2 hatches are 22.5" by 22.5" and 20.5" by 22.5" . 

They are lewmar low profile hatches, but I'm not sure of the model #.

If anyone has the kit # or model # to help me order the gaskets, I would be greatly appreciative.

Jeff

Spirit Amel 54 #14


Re: Amel Santorin Propeller Question

Ian Park
 

Lisa
The transmission on the Santorin is the same as the Super Maramu, well the big ‘C’ drive.
I presume you have the Perkins Prima M50? They have a Hurth gearbox between the Drive and the engine, and I believe both forward and reverse gears have separate clutches. Have you checked the gearbox oil level? The dipstick must be used NOT screwed in, but with the thread just sitting at the top of the aperture otherwise you can over fill it.
I had to have mine replaced in Marin a couple of years ago. The Amel engine mechanic is very good.
We’ll be in Marin over Christmas and New Year getting our outhaul gearbox separated from the boom plus a few other rigging issues. Then on to Antigua - we’ll look out for you.

Ian and Linda
Ocean Hobo. SN96 currently in Bequia


Re: [Amel Yacht Owners] Onan genset trouble code "seven blinks"

Bill & Judy Rouse <yahoogroups@...>
 

John 

Don't look too hard for the water flow sensor that Eric spoke about. If your Onan is original and if nobody added one and also changed the PCB, you will not have one. 

I am not sure of the year this was added, but it certainly wasn't included with your generation of Onan. 

All SM are not equal. 


CW Bill Rouse
Admiral, Texas Navy
Commander Emeritus
Amel School www.amelschool.com
720 Winnie St
Galveston Island, TX 77550
+1(832) 380-4970

   

On Dec 16, 2017 22:34, "'sailormon' kimberlite@... [amelyachtowners]" <amelyachtowners@...> wrote:
 

Hi John,

There is also a sensor in the intake water hose to the raw water pump. The hole in the sensor is small and frequently becomes clogged with rust, It is easy to remove, it just unscrews. It is something to check .

Yo will see it mounted to a piece of pipe in the seawater hose.

Fair Winds

Eric

Kimberlite Amel Super Maramu #376

 

 

From: amelyachtowners@yahoogroups.com [mailto:amelyachtowners@yahoogroups.com]
Sent: Saturday, December 16, 2017 9:22 PM
To: amelyachtowners@yahoogroups.com
Subject: [Amel Yacht Owners] Onan genset trouble code "seven blinks"

 

 

Hi All,

  I case anyone has not seen this before.  Started the Onan 7KW generator after a passage and it turned off shortly after starting.  It gave the seven blinking light trouble code.  My manual indicates this is the “no sea water flow” shutdown.   Don't force the generator to run if you get this code and there is no sea water coming out of the exhaust, like the situation we were in tonight.

 

Checked the obvious sea strainer all good, then broke out tools  to open up the sea water pump and discovered only two vanes left on the impeller.  Installed the onboard ready spare (you should have at least one spare all the time)  but on restart continued to get the no flow shutdown.  Pump was full of water and all vanes aligned correctly.  Checked down stream and found the heat exchanger inlet plugged with …..you guessed it, impeller vanes.   After clearing all the debris and repriming the sea water system the genset is back on line. 

Note, all these steps were rather simple, just a bit tedious.  The pump was easy to open, impeller pulled right out.  New one was a bit of a four letter pushing match to get into the housing but eventually my thumbs won.  The heat exchanger had one bolt to remove the end cap and then used tweezers to pull out the bits of impeller plugging the heat exchanger.    Will post pictures on the FB page. 

 

Take home message, onboard spares, and “yes you can do it yourself with a little patience and common sense.  This repair cost us one impeller, ($30USD)  and 1.5hr labor.  How much would an Onan technician charge us for this repair?  

 

                   Regards,  John

 

John Clark

SV Annie  SM 37

Just moored at St.  Augustine for Christmas

 


Re: [Amel Yacht Owners] Onan genset trouble code "seven blinks"

Mark Erdos
 

What goes in must come out.

 

A couple of helpful hints:

Use dish washing soap to install new impellers. Also the added benefit, when you see bubbles off the side of the boat you know the sea water is flowing.

 

You can also us a shop-vac to remove the impeller blade bits from the heat exchanger.

 

Impeller blade alignment at install doesn’t matter. The impeller will self adjust the blades on the first rotation.

 

I installed an in-line filter between the water pump and the heat exchanger to trap debris from the impeller.

 

 

 

 

With best regards,

 

Mark

 

Skipper

Sailing Vessel - Cream Puff - SM2K - #275

Currently cruising - Martinique

www.creampuff.us

 

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Saturday, December 16, 2017 10:22 PM
To: amelyachtowners@...
Subject: [Amel Yacht Owners] Onan genset trouble code "seven blinks"

 

 

Hi All,

  I case anyone has not seen this before.  Started the Onan 7KW generator after a passage and it turned off shortly after starting.  It gave the seven blinking light trouble code.  My manual indicates this is the “no sea water flow” shutdown.   Don't force the generator to run if you get this code and there is no sea water coming out of the exhaust, like the situation we were in tonight.

 

Checked the obvious sea strainer all good, then broke out tools  to open up the sea water pump and discovered only two vanes left on the impeller.  Installed the onboard ready spare (you should have at least one spare all the time)  but on restart continued to get the no flow shutdown.  Pump was full of water and all vanes aligned correctly.  Checked down stream and found the heat exchanger inlet plugged with …..you guessed it, impeller vanes.   After clearing all the debris and repriming the sea water system the genset is back on line. 

Note, all these steps were rather simple, just a bit tedious.  The pump was easy to open, impeller pulled right out.  New one was a bit of a four letter pushing match to get into the housing but eventually my thumbs won.  The heat exchanger had one bolt to remove the end cap and then used tweezers to pull out the bits of impeller plugging the heat exchanger.    Will post pictures on the FB page. 

 

Take home message, onboard spares, and “yes you can do it yourself with a little patience and common sense.  This repair cost us one impeller, ($30USD)  and 1.5hr labor.  How much would an Onan technician charge us for this repair?  

 

                   Regards,  John

 

John Clark

SV Annie  SM 37

Just moored at St.  Augustine for Christmas

 


Re: [Amel Yacht Owners] Onan genset trouble code "seven blinks"

Eric Freedman
 

Hi John,

There is also a sensor in the intake water hose to the raw water pump. The hole in the sensor is small and frequently becomes clogged with rust, It is easy to remove, it just unscrews. It is something to check .

Yo will see it mounted to a piece of pipe in the seawater hose.

Fair Winds

Eric

Kimberlite Amel Super Maramu #376

 

 

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Saturday, December 16, 2017 9:22 PM
To: amelyachtowners@...
Subject: [Amel Yacht Owners] Onan genset trouble code "seven blinks"

 

 

Hi All,

  I case anyone has not seen this before.  Started the Onan 7KW generator after a passage and it turned off shortly after starting.  It gave the seven blinking light trouble code.  My manual indicates this is the “no sea water flow” shutdown.   Don't force the generator to run if you get this code and there is no sea water coming out of the exhaust, like the situation we were in tonight.

 

Checked the obvious sea strainer all good, then broke out tools  to open up the sea water pump and discovered only two vanes left on the impeller.  Installed the onboard ready spare (you should have at least one spare all the time)  but on restart continued to get the no flow shutdown.  Pump was full of water and all vanes aligned correctly.  Checked down stream and found the heat exchanger inlet plugged with …..you guessed it, impeller vanes.   After clearing all the debris and repriming the sea water system the genset is back on line. 

Note, all these steps were rather simple, just a bit tedious.  The pump was easy to open, impeller pulled right out.  New one was a bit of a four letter pushing match to get into the housing but eventually my thumbs won.  The heat exchanger had one bolt to remove the end cap and then used tweezers to pull out the bits of impeller plugging the heat exchanger.    Will post pictures on the FB page. 

 

Take home message, onboard spares, and “yes you can do it yourself with a little patience and common sense.  This repair cost us one impeller, ($30USD)  and 1.5hr labor.  How much would an Onan technician charge us for this repair?  

 

                   Regards,  John

 

John Clark

SV Annie  SM 37

Just moored at St.  Augustine for Christmas

 


Re: [Amel Yacht Owners] Re: Amel Santorin Propeller Question

Eric Freedman
 

Liasa,

I do not know anything about the transmission on a SN.

However the last thing in the drive chain is the transmission.

My guess I that your transmission is slipping.

I would have someone look into that.

Fair Winds

Eric

Kimberlite Amel Super Maramu #376

 

 

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Saturday, December 16, 2017 5:24 PM
To: amelyachtowners@...
Subject: [Amel Yacht Owners] Re: Amel Santorin Propeller Question

 

 

Thanks Craig. We’ve been investigating all day. Nothing on the prop and it looks good and clean. No black smoke or any other symptoms coming from the engine. The prop spins while we are looking at it but after a few hours of motoring, does not seem to be able to handle going into any wind or waves. Wondering if it may be a gearbox oil issue? That maybe it shuts down as it heats up? Baffled at the moment.
Thanks for the response!
Lisa


Onan genset trouble code "seven blinks"

John Clark
 

Hi All,

  I case anyone has not seen this before.  Started the Onan 7KW generator after a passage and it turned off shortly after starting.  It gave the seven blinking light trouble code.  My manual indicates this is the “no sea water flow” shutdown.   Don't force the generator to run if you get this code and there is no sea water coming out of the exhaust, like the situation we were in tonight.

 

Checked the obvious sea strainer all good, then broke out tools  to open up the sea water pump and discovered only two vanes left on the impeller.  Installed the onboard ready spare (you should have at least one spare all the time)  but on restart continued to get the no flow shutdown.  Pump was full of water and all vanes aligned correctly.  Checked down stream and found the heat exchanger inlet plugged with …..you guessed it, impeller vanes.   After clearing all the debris and repriming the sea water system the genset is back on line. 

Note, all these steps were rather simple, just a bit tedious.  The pump was easy to open, impeller pulled right out.  New one was a bit of a four letter pushing match to get into the housing but eventually my thumbs won.  The heat exchanger had one bolt to remove the end cap and then used tweezers to pull out the bits of impeller plugging the heat exchanger.    Will post pictures on the FB page. 

 

Take home message, onboard spares, and “yes you can do it yourself with a little patience and common sense.  This repair cost us one impeller, ($30USD)  and 1.5hr labor.  How much would an Onan technician charge us for this repair?  

 

                   Regards,  John

 

John Clark

SV Annie  SM 37

Just moored at St.  Augustine for Christmas



Re: [Amel Yacht Owners] Re: Amel Santorin Propeller Question

Porter McRoberts
 

I just was plagued by the exact scenario.
Make sure the transmission fluid dipstick has an excellent seal.
And my issue: i had changed the filter and thought i’d seated the filter cap well, but hadn’t.  a small vacuum leak occurred once pressure built and then over time the pressure would drop, thered be mechanical uncoupling sand slipping of the transmission and also the brake caliper would gradually close onto the rotor.  

Hope this helps.  Have the transmission pressure tested—at the time of the failure, as it would be normal during functional operation.

Porter McRoberts
S/V Ibis: Amel 54-#152
Ft. Lauderdale
www.fouribis.com
portermcroberts@...







On Dec 16, 2017, at 5:53 PM, James Alton lokiyawl2@... [amelyachtowners] <amelyachtowners@...> wrote:

Lisa,


  I am just guessing but it is possible that the transmission on the engine is beginning to slip.  How does the transmission oil look?   Also is the transmission running hot when this problem occurs?   The transmission would see increased loading during wind/ waves and might not slip at lower power settings so if it is getting weak this is when the problem would tend to show itself.   If the transmission is slipping a lot it might be possible to see if the output shaft from the transmission is increasing in RPM as it should as the throttle is advanced during a period when you seem to be losing thrust.  Again just totally guessing but I have experienced a slipping transmission on one boat and it behaved a bit like this.

Best of luck,

James
SV Sueno,  Maramu #220

On Dec 16, 2017, at 6:24 PM, lisallt2@... [amelyachtowners] <amelyachtowners@...> wrote:

Thanks Craig. We’ve been investigating all day. Nothing on the prop and it looks good and clean. No black smoke or any other symptoms coming from the engine. The prop spins while we are looking at it but after a few hours of motoring, does not seem to be able to handle going into any wind or waves. Wondering if it may be a gearbox oil issue? That maybe it shuts down as it heats up? Baffled at the moment. 
Thanks for the response!
Lisa





Re: [Amel Yacht Owners] Re: Amel Santorin Propeller Question

James Alton
 

Lisa,

  I am just guessing but it is possible that the transmission on the engine is beginning to slip.  How does the transmission oil look?   Also is the transmission running hot when this problem occurs?   The transmission would see increased loading during wind/ waves and might not slip at lower power settings so if it is getting weak this is when the problem would tend to show itself.   If the transmission is slipping a lot it might be possible to see if the output shaft from the transmission is increasing in RPM as it should as the throttle is advanced during a period when you seem to be losing thrust.  Again just totally guessing but I have experienced a slipping transmission on one boat and it behaved a bit like this.

Best of luck,

James
SV Sueno,  Maramu #220

On Dec 16, 2017, at 6:24 PM, lisallt2@... [amelyachtowners] <amelyachtowners@...> wrote:

Thanks Craig. We’ve been investigating all day. Nothing on the prop and it looks good and clean. No black smoke or any other symptoms coming from the engine. The prop spins while we are looking at it but after a few hours of motoring, does not seem to be able to handle going into any wind or waves. Wondering if it may be a gearbox oil issue? That maybe it shuts down as it heats up? Baffled at the moment. 
Thanks for the response!
Lisa