[C320-list] Optimal Speed and Lower RPM concerns- Yanmar 3GM30F and Autoprop
Sara Schroeder Skinner
saras951 at comcast.net
Mon Jul 5 17:30:02 PDT 2021
I agree with Joe. I had about 1550 hours on my 3GM30 and the elbow developed a pinhole leak on the side of the elbow. Upon removal the elbow was constricted but everything else was ok. I replaced the exhaust hose and hose clamps. Many hours later of trying to get the elbow safely back on I took it to a shop (insert bloody knuckles, tears and expletives here). They had to use a massive vice and crow bar to properly screw it back together so the exhaust fumes don’t leak.
It was at that moment I decided if there are things that can kill me I am going to have someone else do the work. I applaud the rest of you who do it on your own, but this one was a no-brainer for me.
Sara
Wandering Star
2000/#707
Sent from my iPhone
> On Jul 5, 2021, at 1:01 PM, c320-list-request at lists.catalina320.com wrote:
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> Today's Topics:
>
> 1. Optimal Speed and Lower RPM concerns- Yanmar 3GM30F and
> Autoprop (David Cushman)
> 2. Re: Optimal Speed and Lower RPM concerns- Yanmar 3GM30F and
> Autoprop (John Morrison)
> 3. Re: Optimal Speed and Lower RPM concerns- Yanmar 3GM30F and
> Autoprop (Dick Walker)
> 4. Re: Optimal Speed and Lower RPM concerns- Yanmar 3GM30F and
> Autoprop (RONALD HODEL)
> 5. Re: Optimal Speed and Lower RPM concerns- Yanmar 3GM30F and
> Autoprop (Joe Luciano)
> 6. Re: Optimal Speed and Lower RPM concerns- Yanmar 3GM30F and
> Autoprop (RONALD HODEL)
> 7. Re: Optimal Speed and Lower RPM concerns- Yanmar 3GM30F and
> Autoprop (John Morrison)
> 8. Re: Optimal Speed and Lower RPM concerns- Yanmar 3GM30F and
> Autoprop (Greg Flanagan)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 4 Jul 2021 20:42:13 -0400
> From: David Cushman <ittips99 at comcast.net>
> To: c320-list at lists.catalina320.com
> Subject: [C320-list] Optimal Speed and Lower RPM concerns- Yanmar
> 3GM30F and Autoprop
> Message-ID: <35cc5ac1-f36e-8e18-5e2b-d36782f6ee6c at comcast.net>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> I recently installed an Autoprop of the size recommended by King
> Propulsion. We just completed an 8 day trip with some days that had
> significant motoring and? I am extremely happy with the performance over
> the three blade fixed that came with the boat. My boat speed and the
> engine RPM closely match the data furnished by Dick Walker, previously
> posted on this discussion forum. I notice that my fuel consumption seems
> to be higher at each RPM setting than when using the Catalina standard
> factory wheel. This makes sense to me. It is still much better economy
> than before. What have users found to be the optimal cruising speed for
> fuel economy on longer trips? Are there any concerns running the Yanmar
> 3GM30F at the lower RPMs since hull speed is met and the much higher RPM
> is no longer needed? I know that diesels are supposed to run under
> adequate load and I have read several blogs with slightly mixed
> messages. To me it seems that the feathering of the prop assures that
> the self pitching keeps the engine properly loaded at the lower RPM.
> Opinions and observations are welcome.
>
> Dave Cushman
>
> It Tips
>
> #628
>
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 5 Jul 2021 09:39:51 -0400
> From: John Morrison <sail-ability at sympatico.ca>
> To: C320-List at catalina320.com
> Cc: c320-list at lists.catalina320.com
> Subject: Re: [C320-list] Optimal Speed and Lower RPM concerns- Yanmar
> 3GM30F and Autoprop
> Message-ID: <3589F982-3185-4143-ADAC-CECA033FA4A8 at sympatico.ca>
> Content-Type: text/plain; charset=utf-8
>
> I have a Campbell Sailor fixed 3 blade prop. Hull speed is reached at 2000rpm and the Yanmar diesel seems very happy at that speed, very smooth! I tried a Flex-O-Fold prop on the boat and it was a disaster, vibrated like hell at cruising speed!
> Regards
> JohnM
> 1999#574
>
> Sent from my iPhone
>
>> On Jul 4, 2021, at 8:42 PM, David Cushman <ittips99 at comcast.net> wrote:
>>
>> ?I recently installed an Autoprop of the size recommended by King Propulsion. We just completed an 8 day trip with some days that had significant motoring and I am extremely happy with the performance over the three blade fixed that came with the boat. My boat speed and the engine RPM closely match the data furnished by Dick Walker, previously posted on this discussion forum. I notice that my fuel consumption seems to be higher at each RPM setting than when using the Catalina standard factory wheel. This makes sense to me. It is still much better economy than before. What have users found to be the optimal cruising speed for fuel economy on longer trips? Are there any concerns running the Yanmar 3GM30F at the lower RPMs since hull speed is met and the much higher RPM is no longer needed? I know that diesels are supposed to run under adequate load and I have read several blogs with slightly mixed messages. To me it seems that the feathering of the prop assures that the self pitchin
> g keeps the engine properly loaded at the lower RPM. Opinions and observations are welcome.
>>
>> Dave Cushman
>>
>> It Tips
>>
>> #628
>>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Mon, 5 Jul 2021 07:24:51 -0700
> From: Dick Walker <dickwalker at att.net>
> To: C320-List at catalina320.com
> Subject: Re: [C320-list] Optimal Speed and Lower RPM concerns- Yanmar
> 3GM30F and Autoprop
> Message-ID: <8634677D-1F4F-452A-A1BB-4483B952AD87 at att.net>
> Content-Type: text/plain; charset=utf-8
>
> Thanks for the quote. I had the auto prop for 20 years it has been very good.
>
> Cheers
>
>
>
> Dick Walker
> 740 Olive Ave.
> Coronado ,CA 92118
> 619.985.8105
>
>
>
>> On Jul 5, 2021, at 06:40, John Morrison <sail-ability at sympatico.ca> wrote:
>>
>> ?I have a Campbell Sailor fixed 3 blade prop. Hull speed is reached at 2000rpm and the Yanmar diesel seems very happy at that speed, very smooth! I tried a Flex-O-Fold prop on the boat and it was a disaster, vibrated like hell at cruising speed!
>> Regards
>> JohnM
>> 1999#574
>>
>> Sent from my iPhone
>>
>>>> On Jul 4, 2021, at 8:42 PM, David Cushman <ittips99 at comcast.net> wrote:
>>>
>>> ?I recently installed an Autoprop of the size recommended by King Propulsion. We just completed an 8 day trip with some days that had significant motoring and I am extremely happy with the performance over the three blade fixed that came with the boat. My boat speed and the engine RPM closely match the data furnished by Dick Walker, previously posted on this discussion forum. I notice that my fuel consumption seems to be higher at each RPM setting than when using the Catalina standard factory wheel. This makes sense to me. It is still much better economy than before. What have users found to be the optimal cruising speed for fuel economy on longer trips? Are there any concerns running the Yanmar 3GM30F at the lower RPMs since hull speed is met and the much higher RPM is no longer needed? I know that diesels are supposed to run under adequate load and I have read several blogs with slightly mixed messages. To me it seems that the feathering of the prop assures that the self pitchi
> ng keeps the engine properly loaded at the lower RPM. Opinions and observations are welcome.
>>>
>>> Dave Cushman
>>>
>>> It Tips
>>>
>>> #628
>>>
>>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Mon, 5 Jul 2021 07:51:01 -0700
> From: RONALD HODEL <ronandgail2 at me.com>
> To: C320-List at catalina320.com
> Subject: Re: [C320-list] Optimal Speed and Lower RPM concerns- Yanmar
> 3GM30F and Autoprop
> Message-ID: <33255772-870E-4735-999E-F866E645F2B2 at me.com>
> Content-Type: text/plain; charset=utf-8
>
> Happy (now 5th) of July,
>
> In answer to concerns about running at lower RPMs, the only thing I might add to the discussion is carbon buildup in the exhaust mixing elbow. We bought our boat used and I don?t know if it had ever been changed, but on our trip to Mexico I ran at 2000-2200 RPM ostensibly to save on fuel as fuel wasn?t available everywhere we went. (I knew that was too low an RPM but even with 20 extra gallons of fuel on deck, our motoring range is still quite limited.) About 1/2 way through the trip I had to replace the mixing elbow as it was restricting exhaust flow. If/when we head south again to where the butter melts I?ll add a spare elbow to my spare parts on board. It is considered a consumable.
>
> Ron Hodel
> #1070 Lokomaikai
>
> Sent from my iPhone
>
>> On Jul 5, 2021, at 7:25 AM, Dick Walker <dickwalker at att.net> wrote:
>>
>> ?Thanks for the quote. I had the auto prop for 20 years it has been very good.
>>
>> Cheers
>>
>>
>>
>> Dick Walker
>> 740 Olive Ave.
>> Coronado ,CA 92118
>> 619.985.8105
>>
>>
>>
>>>> On Jul 5, 2021, at 06:40, John Morrison <sail-ability at sympatico.ca> wrote:
>>>
>>> ?I have a Campbell Sailor fixed 3 blade prop. Hull speed is reached at 2000rpm and the Yanmar diesel seems very happy at that speed, very smooth! I tried a Flex-O-Fold prop on the boat and it was a disaster, vibrated like hell at cruising speed!
>>> Regards
>>> JohnM
>>> 1999#574
>>>
>>> Sent from my iPhone
>>>
>>>>> On Jul 4, 2021, at 8:42 PM, David Cushman <ittips99 at comcast.net> wrote:
>>>>
>>>> ?I recently installed an Autoprop of the size recommended by King Propulsion. We just completed an 8 day trip with some days that had significant motoring and I am extremely happy with the performance over the three blade fixed that came with the boat. My boat speed and the engine RPM closely match the data furnished by Dick Walker, previously posted on this discussion forum. I notice that my fuel consumption seems to be higher at each RPM setting than when using the Catalina standard factory wheel. This makes sense to me. It is still much better economy than before. What have users found to be the optimal cruising speed for fuel economy on longer trips? Are there any concerns running the Yanmar 3GM30F at the lower RPMs since hull speed is met and the much higher RPM is no longer needed? I know that diesels are supposed to run under adequate load and I have read several blogs with slightly mixed messages. To me it seems that the feathering of the prop assures that the self pitch
> ing keeps the engine properly loaded at the lower RPM. Opinions and observations are welcome.
>>>>
>>>> Dave Cushman
>>>>
>>>> It Tips
>>>>
>>>> #628
>>>>
>>>
>>
>
>
> ------------------------------
>
> Message: 5
> Date: Mon, 5 Jul 2021 08:16:49 -0700
> From: Joe Luciano <jnluciano at comcast.net>
> To: C320-List at catalina320.com
> Subject: Re: [C320-list] Optimal Speed and Lower RPM concerns- Yanmar
> 3GM30F and Autoprop
> Message-ID: <7A57C89F-48BB-4798-BC2A-A45079D96A80 at comcast.net>
> Content-Type: text/plain; charset=utf-8
>
> If you choose to carry a spare mixing elbow, better carry the entire assembly from the exhaust manifold that bolts up to the engine on one side and clamps to the hose on the other side. Otherwise, you will never get the pieces apart on your boat, unless you carry a large vise and a big cheater pipe / hammer. I just changed mine for the second time, needs to be done in a shop environment.
>
> Joe Luciano
> #1024
>
> Sent from my iPhone
>
>> On Jul 5, 2021, at 7:51 AM, RONALD HODEL <ronandgail2 at me.com> wrote:
>>
>> ?Happy (now 5th) of July,
>>
>> In answer to concerns about running at lower RPMs, the only thing I might add to the discussion is carbon buildup in the exhaust mixing elbow. We bought our boat used and I don?t know if it had ever been changed, but on our trip to Mexico I ran at 2000-2200 RPM ostensibly to save on fuel as fuel wasn?t available everywhere we went. (I knew that was too low an RPM but even with 20 extra gallons of fuel on deck, our motoring range is still quite limited.) About 1/2 way through the trip I had to replace the mixing elbow as it was restricting exhaust flow. If/when we head south again to where the butter melts I?ll add a spare elbow to my spare parts on board. It is considered a consumable.
>>
>> Ron Hodel
>> #1070 Lokomaikai
>>
>> Sent from my iPhone
>>
>>>> On Jul 5, 2021, at 7:25 AM, Dick Walker <dickwalker at att.net> wrote:
>>>
>>> ?Thanks for the quote. I had the auto prop for 20 years it has been very good.
>>>
>>> Cheers
>>>
>>>
>>>
>>> Dick Walker
>>> 740 Olive Ave.
>>> Coronado ,CA 92118
>>> 619.985.8105
>>>
>>>
>>>
>>>>> On Jul 5, 2021, at 06:40, John Morrison <sail-ability at sympatico.ca> wrote:
>>>>
>>>> ?I have a Campbell Sailor fixed 3 blade prop. Hull speed is reached at 2000rpm and the Yanmar diesel seems very happy at that speed, very smooth! I tried a Flex-O-Fold prop on the boat and it was a disaster, vibrated like hell at cruising speed!
>>>> Regards
>>>> JohnM
>>>> 1999#574
>>>>
>>>> Sent from my iPhone
>>>>
>>>>>> On Jul 4, 2021, at 8:42 PM, David Cushman <ittips99 at comcast.net> wrote:
>>>>>
>>>>> ?I recently installed an Autoprop of the size recommended by King Propulsion. We just completed an 8 day trip with some days that had significant motoring and I am extremely happy with the performance over the three blade fixed that came with the boat. My boat speed and the engine RPM closely match the data furnished by Dick Walker, previously posted on this discussion forum. I notice that my fuel consumption seems to be higher at each RPM setting than when using the Catalina standard factory wheel. This makes sense to me. It is still much better economy than before. What have users found to be the optimal cruising speed for fuel economy on longer trips? Are there any concerns running the Yanmar 3GM30F at the lower RPMs since hull speed is met and the much higher RPM is no longer needed? I know that diesels are supposed to run under adequate load and I have read several blogs with slightly mixed messages. To me it seems that the feathering of the prop assures that the self pitc
> hing keeps the engine properly loaded at the lower RPM. Opinions and observations are welcome.
>>>>>
>>>>> Dave Cushman
>>>>>
>>>>> It Tips
>>>>>
>>>>> #628
>>>>>
>>>>
>>>
>
>
>
> ------------------------------
>
> Message: 6
> Date: Mon, 5 Jul 2021 09:38:08 -0700
> From: RONALD HODEL <ronandgail2 at me.com>
> To: C320-List at catalina320.com
> Subject: Re: [C320-list] Optimal Speed and Lower RPM concerns- Yanmar
> 3GM30F and Autoprop
> Message-ID: <75A46913-964B-4401-B79A-D1C26F731E84 at me.com>
> Content-Type: text/plain; charset=utf-8
>
> Yes, indeed. I NEVER would have gotten the two apart
> Ron
>
> Sent from my iPad
>
>> On Jul 5, 2021, at 8:16 AM, Joe Luciano <jnluciano at comcast.net> wrote:
>>
>> ?If you choose to carry a spare mixing elbow, better carry the entire assembly from the exhaust manifold that bolts up to the engine on one side and clamps to the hose on the other side. Otherwise, you will never get the pieces apart on your boat, unless you carry a large vise and a big cheater pipe / hammer. I just changed mine for the second time, needs to be done in a shop environment.
>>
>> Joe Luciano
>> #1024
>>
>> Sent from my iPhone
>>
>>>> On Jul 5, 2021, at 7:51 AM, RONALD HODEL <ronandgail2 at me.com> wrote:
>>>
>>> ?Happy (now 5th) of July,
>>>
>>> In answer to concerns about running at lower RPMs, the only thing I might add to the discussion is carbon buildup in the exhaust mixing elbow. We bought our boat used and I don?t know if it had ever been changed, but on our trip to Mexico I ran at 2000-2200 RPM ostensibly to save on fuel as fuel wasn?t available everywhere we went. (I knew that was too low an RPM but even with 20 extra gallons of fuel on deck, our motoring range is still quite limited.) About 1/2 way through the trip I had to replace the mixing elbow as it was restricting exhaust flow. If/when we head south again to where the butter melts I?ll add a spare elbow to my spare parts on board. It is considered a consumable.
>>>
>>> Ron Hodel
>>> #1070 Lokomaikai
>>>
>>> Sent from my iPhone
>>>
>>>>> On Jul 5, 2021, at 7:25 AM, Dick Walker <dickwalker at att.net> wrote:
>>>>
>>>> ?Thanks for the quote. I had the auto prop for 20 years it has been very good.
>>>>
>>>> Cheers
>>>>
>>>>
>>>>
>>>> Dick Walker
>>>> 740 Olive Ave.
>>>> Coronado ,CA 92118
>>>> 619.985.8105
>>>>
>>>>
>>>>
>>>>>> On Jul 5, 2021, at 06:40, John Morrison <sail-ability at sympatico.ca> wrote:
>>>>>
>>>>> ?I have a Campbell Sailor fixed 3 blade prop. Hull speed is reached at 2000rpm and the Yanmar diesel seems very happy at that speed, very smooth! I tried a Flex-O-Fold prop on the boat and it was a disaster, vibrated like hell at cruising speed!
>>>>> Regards
>>>>> JohnM
>>>>> 1999#574
>>>>>
>>>>> Sent from my iPhone
>>>>>
>>>>>>> On Jul 4, 2021, at 8:42 PM, David Cushman <ittips99 at comcast.net> wrote:
>>>>>>
>>>>>> ?I recently installed an Autoprop of the size recommended by King Propulsion. We just completed an 8 day trip with some days that had significant motoring and I am extremely happy with the performance over the three blade fixed that came with the boat. My boat speed and the engine RPM closely match the data furnished by Dick Walker, previously posted on this discussion forum. I notice that my fuel consumption seems to be higher at each RPM setting than when using the Catalina standard factory wheel. This makes sense to me. It is still much better economy than before. What have users found to be the optimal cruising speed for fuel economy on longer trips? Are there any concerns running the Yanmar 3GM30F at the lower RPMs since hull speed is met and the much higher RPM is no longer needed? I know that diesels are supposed to run under adequate load and I have read several blogs with slightly mixed messages. To me it seems that the feathering of the prop assures that the self pit
> ching keeps the engine properly loaded at the lower RPM. Opinions and observations are welcome.
>>>>>>
>>>>>> Dave Cushman
>>>>>>
>>>>>> It Tips
>>>>>>
>>>>>> #628
>>>>>>
>>>>>
>>>>
>>
>
>
> ------------------------------
>
> Message: 7
> Date: Mon, 5 Jul 2021 14:58:52 -0400
> From: John Morrison <sail-ability at sympatico.ca>
> To: C320-List at catalina320.com
> Subject: Re: [C320-list] Optimal Speed and Lower RPM concerns- Yanmar
> 3GM30F and Autoprop
> Message-ID: <310D4A05-54CB-4EC5-BEA3-03549978BBBE at sympatico.ca>
> Content-Type: text/plain; charset=utf-8
>
> When is the issue with the exhaust elbow appearing? I?ve got 1300hrs on my engine and no sign of it yet. Is this perhaps a salt water issue?
> JohnM
> 1999#574
>
> Sent from my iPhone
>
>> On Jul 5, 2021, at 12:38 PM, RONALD HODEL <ronandgail2 at me.com> wrote:
>>
>> ?are elbow to my spare parts on board. It is considered a consumable.
>>>>
>>>> Ron Hodel
>>>> #1070 Lokomaikai
>>>>
>>>> Sent from my iPhone
>>>>
>>>>>> On Jul 5, 2021, at 7:25 AM, Dick Walker <dickwalker at att.net> wrote:
>
>
>
> ------------------------------
>
> Message: 8
> Date: Mon, 5 Jul 2021 13:17:17 -0600 (MDT)
> From: Greg Flanagan <greg.flanagan at shaw.ca>
> To: C320-List at catalina320.com
> Subject: Re: [C320-list] Optimal Speed and Lower RPM concerns- Yanmar
> 3GM30F and Autoprop
> Message-ID:
> <1756265972.179752657.1625512637741.JavaMail.zimbra at cds216.dcs.int.inet>
>
> Content-Type: text/plain; charset=utf-8
>
> Here is my 2 cents worth: My 2006 edition had serious blocked heating core issues in 2011 including the elbow (completely blocked) and blocked cooling tubes. It all had to be redone. An excellent Yanmar certified mechanic (and friend) told me to rev the engine to 4000rpm for a short burst after stopping in a marina berth or anchorage. This will clear the system. So I have been doing this for 10 years now and on inspection my tubes are completely clean, as is the elbow. He also taught me that there is a small inspection port on the elbow where using a ?digital exam technique? you can feel (inspect) the inside of the elbow without dismantling anything. This exam is and has been done annually.
>
> Cheers,
>
> Greg
> Hoop Dancer #1076
> Sidney, BC
>
>> On Jul 5, 2021, at 11:59 AM, John Morrison <sail-ability at sympatico.ca> wrote:
>>
>> ?When is the issue with the exhaust elbow appearing? I?ve got 1300hrs on my engine and no sign of it yet. Is this perhaps a salt water issue?
>> JohnM
>> 1999#574
>>
>> Sent from my iPhone
>>
>>>> On Jul 5, 2021, at 12:38 PM, RONALD HODEL <ronandgail2 at me.com> wrote:
>>>
>>> ?are elbow to my spare parts on board. It is considered a consumable.
>>>>>
>>>>> Ron Hodel
>>>>> #1070 Lokomaikai
>>>>>
>>>>> Sent from my iPhone
>>>>>
>>>>>>> On Jul 5, 2021, at 7:25 AM, Dick Walker <dickwalker at att.net> wrote:
>>
>
> End of C320-list Digest, Vol 4049, Issue 1
> ******************************************
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