[C320-list] Yanmar issue

[Descher, Chris]

I'm starting to agree that it's a valve problem.  Probably intake(s) sticking open which later get freed up, so that the engine then runs normally.  Wish I knew the cause.  Hadn't really planned on a valve job this time of year.  Maybe I can limp through until next winter. 

Chris Descher 

Sent from my iPhone

> On Mar 24, 2014, at 6:25 PM, "Jerry Brown" <jbrown01015 at outlook.com> wrote:
> 
> Question for the knowledgeable.   The Yanmar has de compressors for each cylinder. Would an open de compressor give the effect described? I have started mine quite often in temperatures only slightly above freezing more than once at the beginning and end of our season. Never had the slightest issue. It started promptly every time.
> 
> Jerry Brown
> 1137 Indigo
> 
> Sent from my BlackBerry 10 smartphone on the Rogers network.
> From: amshd2 at aol.com
> Sent: Monday, March 24, 2014 6:28 PM
> To: C320-List at Catalina320.com
> Reply To: C320-List at Catalina320.com
> Subject: Re: [C320-list] Yanmar issue
> 
> 
> 
> Sounds like it could be a stuck valves. Could also be a problem with a crack head or a bad head gasket.
> 
> Unless you have the right tools and and know how to take apart the top end of the engine you might consider calling the mechanic at this point.
> 
> 
> -----Original Message-----
> From: JJ Morrison <sail-ability at sympatico.ca>
> To: Catalina List <c320-list at catalina320.com>
> Sent: Mon, Mar 24, 2014 2:10 pm
> Subject: Re: [C320-list] Yanmar issue
> 
> 
> With exhaust coming out the air intake it sounds as if there is an air intake
> valve not closing completely on the compression stroke. This would also result
> in difficult starting. My engine has a thousand hours on it and even around zero
> degrees C; 32 degrees F it starts fairly easily.CheersJohnM1999#574
> 
>> From: cdescher at cedtulsa.com
>> To: C320-List at Catalina320.com
>> Date: Mon, 24 Mar 2014 14:16:29 +0000
>> Subject: [C320-list] Yanmar issue
>> 
>> I've got hull #500 with 700 hours on the Yanmar.  I've never had a problem
> with it until the last two weekends.  The engine is probably around 40 degrees,
> so it takes some cranking to start.  When it does start it's really rough, and
> the cabin fills with smoke.  It's bad.  What I discovered yesterday is that when
> it first starts, it's blowing exhaust out of the intake.  I turn it off and try
> again a few minutes later and it runs normally.  My hope is that this is
> temperature related and with warming weather it will go away.  Any ideas?
>> 
>> Chris Descher
> 
> 
>