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EGT Sensors

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paul.mcallister

Joined: 09 Jan 2006
Posts: 177
Location: Waukesha, WI USA

Posted: Mon Jul 10, 2006 7:07 pm Post subject: EGT Sensors

Hi  all,

  

 I have  an unusual problem.  I have two EGT sensors installed, one on the front  port exhaust and the other on the rear starboard.

  

 The  probes and the mounts were supplied by Grand Rapids.  The probe mounts are  simple screw in devices with a compression gland to secure the probe.  They  are made of brass.  The problem I am having is that every 50 hours or so  the rear gland unscrews itself.  When I install it, its is really tight to  screw in, but it still comes out.  I have replaced it 3 times but it hasn't  made any difference, the darn thing still eventually unscrews.  It never  happens to the front pipe, which is cooler than the rear  one. 

  

 Anyone  have any ideas on what to do ?.  My first thought is to try and get one  made out of stainless steel so the co-efficient of expansion is the  same.

  

 Thanks,  Paul

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SPurpura(at)aol.com
Guest

Posted: Mon Jul 10, 2006 7:18 pm Post subject: EGT Sensors

Not unusual, mine get loose (at) about 25 hrs

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flyinggpa(at)comcast.net
Guest

Posted: Mon Jul 10, 2006 7:35 pm Post subject: EGT Sensors

Paul

  

 Interesting.  It may be hat the engine vibration is doing the  unscrewing when the nut is hot. I think I would try to drill it for a safety  wire.  That is what safety wire is suppose to fix. See if you can get a  angled hole through one side.

  

 Just my thoughts. My EGT probes are the clamp on type (912S) and I had to  weld a boss on the pipe to prevent it from cracking.

 

Cliff Shaw

1041 Euclid ave.

Edmonds, WA 98020

425 776  5555

http://www.europaowners.org/WileE

  

  

 [quote]   ---

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rparigor(at)suffolk.lib.n
Guest

Posted: Mon Jul 10, 2006 8:52 pm Post subject: EGT Sensors

Hello Paul



 	  Quote: 	
		   Anyone have any ideas on what to do ?.  My first thought is to try and get

 one made out of stainless steel so the co-efficient of expansion is the

 same.


	


I can't quite exact visualize what you have, perhaps some general ideas

will help?



Call Grand Rapids and ask them how to secure

If Grand Rapids has no ideas, ask them for a name of someone who does

If the probe bottoms, make sure it contacts uniform, check from no unscrew

to does unscrew

Can you put on front starboard and rear port?

Install a star washer, check McMaster for high temp?

Install a lock washer

Buy (McMaster) if a hex, they have folded up sheet metal hex that allows

you to safety wire

Can you drill and safety wire?

You may want to use a spring instead of, or along with safety wire

Put a clamp on probe and safety wire/spring that

Make a bendable tab, like motorcycles use to secure hub hardware

I never tried it, but perhaps some of the muffler repair paste would turn

to glass and hold into position?

Could you drill and tap the female and install a set screw that could be

safety wired?

If you look close at how a turnbuckle works with the spring clips instead

of safety wiring, you may be able to go in with a precision file, and file

half on the female, and 1/2 on the male and insert a fashioned clip.

McMaster sells wonderful shim washers. they are made up of a gazillion

layers, you select how much you need by splitting with a razor blade. You

could also purchase shims, or shim washers, or shim-stock and make your

own. What i am getting at is if you do the file trick, if you missed by a

little, shim till perfect

Look in McMaster for high temp thread loctite

I have machined a groove on a hex and installed a snap ring, then safety

wired or used a spring on the snap ring



If none of above are suitable, explain exact how probe works, or better

yet take a picture and i will think a bit harder.

Ron Parigoris



You could always put a drop of iodine on the threads, then you will not

have to worry about anyone "EVER" removing. Since you have the bottle out,

put 1 drop on 1 lug nut of each wheel of the neighbors car you hate, about

2 weeks before you put 8 nails under tires (4 propped forward, 4 propped

rear)

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Ivor Phillips

Joined: 16 Jan 2006
Posts: 253
Location: London UK

Posted: Tue Jul 11, 2006 1:32 am Post subject: EGT Sensors

I am using Westach 712-4D6K EGT sensors and had no trouble in drilling the captive nut to take locking wire, But no operational experiences yet!  

Regards  

Ivor  

         

  

From: owner-europa-list-server(at)matronics.com [mailto:owner-europa-list-server(at)matronics.com] On Behalf Of Paul McAllister

 Sent: 11 July 2006 04:05

 To: europa-list(at)matronics.com

 Subject: EGT Sensors  

  

     

Hi all,  

    

   

    

I have an unusual problem.  I have two EGT sensors installed, one on the front port exhaust and the other on the rear starboard.  

    

   

    

The probes and the mounts were supplied by Grand Rapids.  The probe mounts are simple screw in devices with a compression gland to secure the probe.  They are made of brass.  The problem I am having is that every 50 hours or so the rear gland unscrews itself.  When I install it, its is really tight to screw in, but it still comes out.  I have replaced it 3 times but it hasn't made any difference, the darn thing still eventually unscrews.  It never happens to the front pipe, which is cooler than the rear one.   

    

   

    

Anyone have any ideas on what to do ?.  My first thought is to try and get one made out of stainless steel so the co-efficient of expansion is the same.  

    

   

    

Thanks,  Paul

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europa(at)triton.net
Guest

Posted: Tue Jul 11, 2006 3:57 am Post subject: EGT Sensors

Paul,



We are using EI ungrounded sensors.  They come with a stainless steel

compression fitting.  Unfortunately the fitting is not available in metric

threads as required to fit the boss on the exhaust supplied by Rotax.  We

just had our machine shop rethread the supplied fittings to the metric

thread.  We've had no problem with them loosening in 60 hrs.  You should be

able to find stainless steel fittings at McMaster or similar suppliers.



Jim & Heather

N241BW

40 hrs finally complete!!

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