[Public-List] A4 question

[Chris H]

If its a moyet rebuild then your in good shape. The idle speed IMHO is set too high. I set mine to 900 rpm. If you have an inline fuel bulb check it as they were recalled in the time period you reference as they would leak at the crimp fittings. If the engine slows at idle its typically a fuel supply issue. How old is the fuel. Was it stabilized. Remember that fuel now has up too 15'% ethanol in it and this creates a sludge when stabilized as well as not playing nice with rubber. The trani is splashed with the same oil as the engine so no issues there in terms of reduced idle speed. Technically the two issues are not related. Prop drag is a possibilty but unlikely as it came back up to speed. My guess is its either a fuel issue or air leak. Stsrt with the carb engine running and inspect for leaks working back to the tank. In any case if the engine performes well under load, its not a big issue. Just a nuisance. 

Ch

Bill Ydel <wcydel at gmail.com> wrote:
>Thanks, I will go down to the marina again today and let her run for a
>longer period. The engine is less the 2 years old from Moyer and has
>about about 40 hrs of use. Gas tank is new, all new fuel lines and new
>Racor filter.
>
>Bill
>
>Sent from my iPad
>
>On Jan 6, 2014, at 12:37 AM, Glenn Brooks <brooks.glenn at comcast.net>
>wrote:
>
>> Bill,  what engine do you have? 
>> 
>> Any number of possibilities...  Could have been a bit of dirty fuel,
>or a shot of water that froze in  the fuel system and reduced flow to
>the engine, or if an older gas engine, something to do with the
>ignition.  Also a common and vexing problem in old  boats is they
>eventually can develop a pin hole in the pickup tube in the fuel tank
>through galvanic corrosion , sometimes even the tube breaks completely
>off.  In that case the pickup tube can't draw adequate fuel into the
>injectors or carb and so the engine runs slowly or quits. But will
>start up again when fuel sloughs around the tube.   Usually it's easy
>to check the pickup tube, if you have an inspection plate on top of the
>tank.  Something dragging on the prop also is a possibility.  
>> 
>> Easiest thing is to run the engine some more, under different loads
>and see if the problem reoccurs.  If not, probably just bad fuel and
>your good to go...
>> 
>> Glenn Brooks
>> dolce 318
>> 
>> Sent from my iPad
>> 
>>> On Jan 5, 2014, at 7:28 PM, a silva <picomar1957 at hotmail.com> wrote:
>>> 
>>> im not a xpert but maybe something got into your prop
>>> check oil in transmision try turning motor in gear with hand crank
>and listen or feel for anything unusual
>>> 
>>> -----Original Message----- From: Bill Ydel
>>> Sent: Sunday, January 05, 2014 10:58 AM
>>> To: Alberg 30 Public List -- open to all
>>> Subject: [Public-List] A4 question
>>> 
>>> I was running the engine yesterday to bring it up to operating
>temperature. It started just fine and ran smoothly but after a few
>minutes the rpm's dropped to about 600. I had been running in gear at
>the dock at about 1200 RPM's, I took it out of gear and gave it some
>more throttle to get it back to 1200. After a few moments the RPM's
>increased.
>>> The engine was still running smoothly.
>>> Anyone have any thoughts about the cause for the change in RPM's. I
>would expect that it could be a number of things, but let's start with
>the simple. I am NOT a mechanic.
>>> 
>>> Bill
>>> SallyB #441
>>> Charleston, SC
>>> 
>>> Sent from my iPad
>>> 
>>> 
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