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Socket for intake drain plugs

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yak55m(at)gmail.com
Guest

Posted: Tue Oct 21, 2008 8:21 am Post subject: Socket for intake drain plugs

Hi,



sorry if I get the terminology wrong for this (new to the engine details).  I wanted to know if there is a recommended socket size I can use to remove the 3 intake drains if/when I experience hydraulic lock (vs. removing the plugs from the bottom 3 cylinders) ?  Unfortunately I do not have any of the original Yak tools.

 

Thanks,



Anthony.



  [quote][b]

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viperdoc(at)mindspring.co
Guest

Posted: Tue Oct 21, 2008 9:41 am Post subject: Socket for intake drain plugs

Anthony,  

An adjustable works fine. Better yet contact Jim Kimball at http://www.jimkimballenterprises.com/site.html . Ask them for their drain kit. Pull your drain plugs, drill them out and tap them for the thread size (sorry do not remember the size because Dennis did my modification for me) then install the kit. It will not prevent hydraulic lock but it will certainly minimize the risk if you open the drain each time after flying.   

Doc  

     

From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Yak 55M

 Sent: Tuesday, October 21, 2008 11:21 AM

 To: yak-list(at)matronics.com

 Subject: Socket for intake drain plugs  

  

     

Hi,

 

 sorry if I get the terminology wrong for this (new to the engine details).  I wanted to know if there is a recommended socket size I can use to remove the 3 intake drains if/when I experience hydraulic lock (vs. removing the plugs from the bottom 3 cylinders) ?  Unfortunately I do not have any of the original Yak tools.

 

 Thanks,

 

 Anthony.  

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       [quote][b]

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mark.bitterlich(at)navy.m
Guest

Posted: Tue Oct 21, 2008 1:20 pm Post subject: Socket for intake drain plugs

Anthony, just in case you were not aware of this, oil in the intakes and

oil in the cylinders can sometimes be two different issues to start off

with anyway.  



1.  Any oil that gets into the intake can of course end up being sucked

into the cylinder itself and if there is enough of it... You can get a

hydraulic lock and everything that happens after that.  Having an intake

drain kit, or... Pulling the intake drain plugs will help prevent that. 



BUT !!!!  



2.  Oil can get into the cylinders via other means, so there is no

"VERSUS" when it comes to spark plugs "versus" intake drain plugs.  What

I mean by this is: 



   A.  Having an intake drain kit or pulling the intake drain plugs will

not prevent oil from getting into the cylinder by other means.  

   B.  Once the oil gets into the cylinder enough to cause a lock, there

are only two ways to remove it.  The best being.. You have to yank out

the sparkplug(s), or ... The more dangerous method... Spin the engine

over backwards which will normally send the oil from the cylinders out

into the intake tubes.  Now if your intake drain plugs are already

removed when you do that, you'll PROBABLY be ok, as all that oil will

come out from those intake drain plug holes.  However, if you just have

an intake drain KIT, it is possible that the smaller holes from that kit

will not allow all the oil to come out, and then when you start the

engine, you can end up sucking all that oil right back into the cylinder

again ... ruining your engine.  



Bottom line, the safest method is to yank the spark plugs if you feel

any kind of abnormal resistance when pulling the prop through before

flight.  



There are alternatives.  There is a ball check valve in the oil pump

assy that is what allows all that oil to get in there anyway.  It is

possible to fix this and then reduce the oil that gets into the engine

just sitting there.  This is not really a total cure from my experience.

Another method is to install a manual valve that totally shuts off oil

from the oil reservoir tank to the engine.  This method is SUPER, with

the exception that if you somehow forget to turn it on before you start

the engine, you will RUIN the engine.  Various interlocks are available

to prevent this error, but nothing is perfect and this method still

scares a lot of people.  Me included.  



Yet another method is to install an electric pump that pumps out the

engine sump after flight.  As the engine then sits there, the sump has

to fill first before it starts getting into the cylinders.  If you come

by every week or so and run the sump pump, you pretty much keep ahead of

the problem.  This seems to work extremely well too from what I have

seen.  



The money is no object solution is to actually totally top the whole

engine and put in new cylinders and pistons.  The new pistons use

gapless rings which help prevent this problem too, and with the

increased compression ratio from this kit, you can expect about another

30-40 HP or so from the engine.  About 15 grand for this conversion last

I heard.



So you see, it is a problem with many approaches and solutions.  



Mark Bitterlich

   



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LawnDart

Joined: 05 Jun 2006
Posts: 64

Posted: Tue Oct 21, 2008 1:41 pm Post subject: Re: Socket for intake drain plugs

36mm

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yak55m(at)gmail.com
Guest

Posted: Tue Oct 21, 2008 7:37 pm Post subject: Socket for intake drain plugs

Exactly what I needed to know - thanks so much.



Regards,



Anthony.



On Tue, Oct 21, 2008 at 2:41 PM, LawnDart <propwash(at)gmail.com (propwash(at)gmail.com)> wrote:

 [quote]--> Yak-List message posted by: "LawnDart" <propwash(at)gmail.com (propwash(at)gmail.com)>

  

 36mm

 

 

 

 

 Read this topic online here:

 

 [url=http://forums.matronics.com/viewtopic.php?p 9739#209739]http://forums.matronics.com/viewtopic.php?p 9739#209739[/url]

 

 

 

 

 

 

 

 

 

 

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