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Probe Question

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jcrowder(at)lpbroadband.n
Guest

Posted: Fri Apr 11, 2008 3:06 pm Post subject: Probe Question

There was a thread that ran regarding small holes between the plugs on some

of our engines.  I tried to follow this thread, but do not recall reading a

definitive answer.  The thought was that these might be for temperature

probs.  I just checked my engine and I do have small holes (about 1/8"

diameter and about one inch deep, I didn't actually measure).  Are these the

holes in question and are they for probes?



Jim Crowder

S5/3300 Jabiru (Engine swap in process)

North Front Range of Colorado

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BobsV35B(at)aol.com
Guest

Posted: Fri Apr 11, 2008 3:23 pm Post subject: Probe Question

Good Afternoon Jim,

  

 I hate to add to an uncertainty with something I cannot substantiate, but I  was told that those holes are put there for use of CHT probes. The problem is  that no one is making a probe of the proper temperature range that will fit in  those holes. 

  

 Incidentally, I did find a Champion spark plug that appears to be  interchangeable with those that came with the engine. The Champions use a  smaller wrench. (I think it is 5/8ths of an inch instead of 11/16th of an inch.)  That small change makes it just a tiny bit easier to tighten the CHT probes  on the spark plugs. I believe this is all in the maintenance manual, but it is  important to get the gasket off the plug and put the CHT probe on the plug  before the gasket is applied. I found it very difficult to get the supplied  spark plug gasket off of the Champion plug so that I could put the CHT sensor on  the plug before the plug gasket. Worked easier on the supplied plugs.

  

 Sure wish they would find a way to use those little holes for the CHT  temperature!

  

 Happy  Skies,



Old Bob

AKA

Bob Siegfried

Ancient Aviator

628 West  86th Street

Downers Grove, IL 60516

630 985-8502 

Stearman  N3977A

Brookeridge Air Park LL22

  

  In a message dated 4/11/2008 6:06:38 P.M. Central Daylight Time,  jcrowder(at)lpbroadband.net writes:

  	  Quote: 	
		  -->    Jabiru-List message posted by: "Jim Crowder"    <jcrowder(at)lpbroadband.net>



There was a thread that ran regarding    small holes between the plugs on some

of our engines.  I tried to    follow this thread, but do not recall reading a

definitive answer.     The thought was that these might be for temperature

probs.  I just    checked my engine and I do have small holes (about 1/8"

diameter and about    one inch deep, I didn't actually measure).  Are these the

holes in    question and are they for probes?



Jim Crowder

S5/3300 Jabiru (Engine    swap in process)

North Front Range of  Colorado

	






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BobsV35B(at)aol.com
Guest

Posted: Fri Apr 11, 2008 3:42 pm Post subject: Probe Question

Pardon the uncertainty, but I think the supplied spark plugs uses an 18 MM  wrench, not an 11/16ths one. 

  

 It has been almost a  week and a half since I tightened them and my  memory is getting very short!

  

 Happy  Skies,



Old Bob

AKA

Bob Siegfried

Ancient Aviator

628 West  86th Street

Downers Grove, IL 60516

630 985-8502 

Stearman  N3977A

Brookeridge Air Park LL22

  

  In a message dated 4/11/2008 6:20:42 P.M. Central Daylight Time, Bobs V35B  writes:

  	  Quote: 	
		     Incidentally, I did find a Champion spark plug that appears to be    interchangeable with those that came with the engine. The Champions use a    smaller wrench. (I think it is 5/8ths of an inch instead of 11/16th of an    inch.) That small change makes it just a tiny bit easier to tighten the    CHT probes on the spark plugs. I believe this is all in the maintenance    manual, but it is important to get the gasket off the plug and put the CHT    probe on the plug before the gasket is applied. I found it very difficult to    get the supplied spark plug gasket off of the Champion plug so that I could    put the CHT sensor on the plug before the plug gasket. Worked easier on the    supplied  plugs.

	






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