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Cold Cylinder - housei

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glipaz

Joined: 11 Jan 2011
Posts: 111

Posted: Wed Dec 11, 2013 9:02 pm Post subject: Cold Cylinder - housei

Hi Gang.   Mid flight we experienced a vibration in the engine.  Upon landing a mag check revealed vibration on mag 2.   In test, cylinder #1 is cold on mag 2.  In order: replaced spark plug, tested lead (was good), cleaned mag cap, replaced mag cap, replaced lead.   Still cold cylinder on mag 2; but, runs properly on mag 1.   It is hard to believe that the mag or rotor or points are bad since only one cylinder is affected.  Thoughts?!



Gil Lipaz

Nanchang CJ6/A

310-245-7078

dsavarese0812(at)bellsout
Guest

Posted: Thu Dec 12, 2013 5:17 am Post subject: Cold Cylinder - housei

Most likely the proverbial ignition harness problem.  The plug wire 

insulation may be cracked causing the plug wire to arc to the braided 

shield which is of course, grounded.  Not an easy task to pull a new 

wire through the harness.  And when doing this job, you keep your 

fingers and toes crossed hoping and praying the old and new wire do not 

separate inside the ring when you are pulling it through.



You may want to consider doing the automotive conversion that over 500 

Yak and CJ owners all over the world have done to eliminate the 

"Achilles Hee"l of the Housai and M14 engines, the ignition harness.   

You can read all about it here.

http://www.yak-52.com/plug_conversion.htm



Contact me off-list if you wish to discuss it.

Dennis



A. Dennis Savarese

334-285-6263

334-546-8182 (mobile)

www.yak-52.com

Skype - Yakguy1



On 12/11/2013 11:02 PM, Gil Lipaz wrote:

 	  Quote: 	
		   



 Hi Gang.   Mid flight we experienced a vibration in the engine.  Upon landing a mag check revealed vibration on mag 2.   In test, cylinder #1 is cold on mag 2.  In order: replaced spark plug, tested lead (was good), cleaned mag cap, replaced mag cap, replaced lead.   Still cold cylinder on mag 2; but, runs properly on mag 1.   It is hard to believe that the mag or rotor or points are bad since only one cylinder is affected.  Thoughts?!



 Gil Lipaz

 Nanchang CJ6/A

 310-245-7078

GeorgeCoy

Joined: 02 Dec 2010
Posts: 310

Posted: Thu Dec 12, 2013 5:43 am Post subject: Cold Cylinder - housei

Check for an intake leak at the cylinder as well.

George



Sent from my iPad



 	  Quote: 	
		   On Dec 12, 2013, at 12:02 AM, Gil Lipaz <glipaz(at)yahoo.com> wrote:

 

 

 

 Hi Gang.   Mid flight we experienced a vibration in the engine.  Upon landing a mag check revealed vibration on mag 2.   In test, cylinder #1 is cold on mag 2.  In order: replaced spark plug, tested lead (was good), cleaned mag cap, replaced mag cap, replaced lead.   Still cold cylinder on mag 2; but, runs properly on mag 1.   It is hard to believe that the mag or rotor or points are bad since only one cylinder is affected.  Thoughts?!

 

 Gil Lipaz

 Nanchang CJ6/A

 310-245-7078

dsavarese0812(at)bellsout
Guest

Posted: Thu Dec 12, 2013 5:51 am Post subject: Cold Cylinder - housei

Also, did you do a compression test on the cylinder?  If not, might be a 

good idea.  Listen carefully for intake and exhaust leaks while doing 

the compression test.

Dennis



A. Dennis Savarese

334-285-6263

334-546-8182 (mobile)

www.yak-52.com

Skype - Yakguy1



On 12/12/2013 7:34 AM, George Coy wrote:

 	  Quote: 	
		   



 Check for an intake leak at the cylinder as well.

 George



 Sent from my iPad



> On Dec 12, 2013, at 12:02 AM, Gil Lipaz <glipaz(at)yahoo.com> wrote:

>

> 

>

> Hi Gang.   Mid flight we experienced a vibration in the engine.  Upon landing a mag check revealed vibration on mag 2.   In test, cylinder #1 is cold on mag 2.  In order: replaced spark plug, tested lead (was good), cleaned mag cap, replaced mag cap, replaced lead.   Still cold cylinder on mag 2; but, runs properly on mag 1.   It is hard to believe that the mag or rotor or points are bad since only one cylinder is affected.  Thoughts?!

>

> Gil Lipaz

> Nanchang CJ6/A

> 310-245-7078

>

>

keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Thu Dec 12, 2013 8:45 am Post subject: Re: Cold Cylinder - housei

Perhaps consider a new lead, running it outside the collar just to confirm. If that turns out to be the issue, unless you are a purist, I would not hesitate for a second replacing the old harness with the conversion Dennis mentions. I'd put this at the top of my "money well spent" list.



Keith

keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Thu Dec 12, 2013 8:46 am Post subject: Re: Cold Cylinder - housei

George, What is the best way to check for an intake leak at the cylinder?



Keith

GeorgeCoy

Joined: 02 Dec 2010
Posts: 310

Posted: Thu Dec 12, 2013 8:54 am Post subject: Cold Cylinder - housei

Check the connections at the cylinder and at the supercharger housing. 



Sent from my iPad



 	  Quote: 	
		   On Dec 12, 2013, at 11:46 AM, "keithmckinley" <cetopfed(at)gmail.com> wrote:

 

 

 

 George, What is the best way to check for an intake leak at the cylinder?

 

 Keith

 

 --------

 Keith McKinley

 700HS

 X26 Sebastian, FL

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=415448#415448

keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Thu Dec 12, 2013 9:26 am Post subject: Re: Cold Cylinder - housei

So more or less just checking for loose connections/tightness

 I guess ...

mark.bitterlich(at)navy.m
Guest

Posted: Thu Dec 12, 2013 10:50 am Post subject: Cold Cylinder - housei

Personally, when I have a cylinder that fires on one mag and does not fire on another, I will stay with it being an ignition problem until I see a nice strong spark coming from the spark plug in question.  Then it might be time to move on to other things.  Checking compression and intake tubes is all good troubleshooting for a cylinder that will not fire .... at all.  When it fires on one mag and does not fire on the other mag, seems kind of odd to me for it to be anything other than ignition, but hey .. it never hurts to check.  If you look at the intake tubes and the compression is reasonable, move back to the ignition.

I assume you have the stock ignition harness?  Good time to change it.

In any case, if you remove the plug from the cylinder and attach the spark plug lead to the spark plug and attach a wire to ground from the plug metal case, if you spin that mag fast enough, you ought to be able to see it spark.  I'd remove the rear or forward plugs from the engine so you can really spin the prop through by hand with speed.  Then hook up plug number (anything other than 2) as I just mentioned.  Spin the prop through fast and the observer ought to be able to see the spark plug fire.  Now that you have verified that it has worked, try the same test again with the bad cylinder.  See what happens.  There is no better proof of seeing what is happening with a spark plug than looking straight at the darn thing.

Mark

p.s.  Before you try any of this, start the engine on both mags and using an IR Heat Gun that reads out temperatures, run the engine with both mags at about 50% or so for some 15 minutes (more or less) and read the cylinder head temps.  See if #2 is WAY WAY off from the others.  If it is, I'd go with something wrong with fuel air ratio (intake tubes, etc.)   If the temps are within range of all the other cylinders..,. I really would go back to ignition.

________________________________

From: owner-yak-list-server(at)matronics.com [owner-yak-list-server(at)matronics.com] on behalf of A. Dennis Savarese [dsavarese0812(at)bellsouth.net]

Sent: Thursday, December 12, 2013 8:50 AM

To: yak-list(at)matronics.com

Subject: Re: Cold Cylinder - housei

Also, did you do a compression test on the cylinder?  If not, might be a

good idea.  Listen carefully for intake and exhaust leaks while doing

the compression test.

Dennis

A. Dennis Savarese

334-285-6263

334-546-8182 (mobile)

www.yak-52.com<http://www.yak-52.com/>

Skype - Yakguy1

On 12/12/2013 7:34 AM, George Coy wrote:

 	  Quote: 	

 Check for an intake leak at the cylinder as well.

 George

 Sent from my iPad

> On Dec 12, 2013, at 12:02 AM, Gil Lipaz <glipaz(at)yahoo.com> wrote:

>

> 

>

> Hi Gang.   Mid flight we experienced a vibration in the engine.  Upon landing a mag check revealed vibration on mag 2.   In test, cylinder #1 is cold on mag 2.  In order: replaced spark plug, tested lead (was good), cleaned mag cap, replaced mag cap, replaced lead.   Still cold cylinder on mag 2; but, runs properly on mag 1.   It is hard to believe that the mag or rotor or points are bad since only one cylinder is affected.  Thoughts?!

>

> Gil Lipaz

> Nanchang CJ6/A

> 310-245-7078

>

>

dsavarese0812(at)bellsout
Guest

Posted: Thu Dec 12, 2013 12:08 pm Post subject: Cold Cylinder - housei

Ether is the best thing to spray at the individual intake tube gland 

nuts at the supercharger case as well as on the other end of the tube at 

the cylinder.  If the rpm increases, it's leaking.  Obviously, the 

engine has to be running.  So be very careful, not only of the prop, but 

the exhaust stack which will burn the crap out of you if you 

accidentally touch it.



Another test you can do before the Ether test - Just for grins, measure 

the resistance of the wire from the plug to the staking screw in the mag 

cap.  Check the one that you believe is bad and then check one that you 

know is good and compare the resistance. Like for example, if #1 front 

is bad, check that one and then go to #3 front because the wires are in 

firing order in the cap.  The rotor turns counterclockwise.  When you 

turn the cap over, it will be clockwise rotation.  Assuming the ignition 

harness is the original harness, the resistance should be very close to 

zero ohms on a good wire.

Dennis



A. Dennis Savarese

334-285-6263

334-546-8182 (mobile)

www.yak-52.com

Skype - Yakguy1



On 12/12/2013 10:46 AM, keithmckinley wrote:

 	  Quote: 	
		   



 George, What is the best way to check for an intake leak at the cylinder?



 Keith



 --------

 Keith McKinley

 700HS

 X26 Sebastian, FL





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=415448#415448

keithmckinley

Joined: 11 Aug 2008
Posts: 434

Posted: Thu Dec 12, 2013 12:55 pm Post subject: Re: Cold Cylinder - housei

Excellent  Posts!



Keith

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