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Mod 72 Debacle

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ptiller(at)lolacars.com
Guest

Posted: Thu Apr 03, 2008 9:44 am Post subject: Mod 72 Debacle

Suppose that you were doing Mod 72 and it was going to be really easy as you you are still building and haven't got the engine attached.



So, suppose that you have borrowed the club reamer and opened up the tubes in the undercarriage frame and cleaned them out.  The unpainted inserts could then be pushed in by hand until only about 1cm was showing.



Suppose then that you were rather enthusiastic with the etch primer and after it had dried, tried to push the inserts in.  Having got them half way in with a hammer, what would you do if they really really didn't want to go any further in?  I mean hitting them with a hammer via a block of wood is just splitting the wood.



What would you do?  I doubt they are going to come out.  Should I hit them harder, heat the frame, pour acetone down to remove the etch primer or just wait for the ACF 50 to work it's way through and try again?



Any thoughts would be more than appreciated,



Thanks,



Phil

Visit -  www.EuropaOwners.org

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ward.t(at)xtra.co.nz
Guest

Posted: Thu Apr 03, 2008 11:02 am Post subject: Mod 72 Debacle

Phil,

I would cut them. I know of another builder having the same problem and that 

is the best solution.

Cheers,

Tim

Tim Ward

12 Waiwetu Street,

Fendalton,

CHRISTCHURCH 8052

NEW ZEALAND



Ph :64 03 3515166

Mob:  021 0640221



email:

ward.t(at)xtra.co.nz

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ptag.dev(at)tiscali.co.uk
Guest

Posted: Thu Apr 03, 2008 11:24 am Post subject: Mod 72 Debacle

Hi! Phil

I would make a "spigot type anvil" of solid bar to fit the inner tube

and sit on the outer end of the tube you are driving in. Make the spigot

end as long as the tubes you are driving then try driving your offending

tube home.

If however you still fail then heat to "cherry red" the spigot end which

goes into the assembly, allow it to transfer some heat and try again.

Regards

Bob Harrison G-PTAG



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n914va(at)bvunet.net
Guest

Posted: Thu Apr 03, 2008 11:38 am Post subject: Mod 72 Debacle

Please wait for more responses before cutting them off. There must be a way 

of getting them out without damaging the mounting frame. I have yet to 

insert mine, but wondered if what you describe was a possibility. It seems 

that cutting them half off would defeat the whole purpose of inserting them. 

Wait for others to reply, but  if none do, I would put vice grips on the 

insert and heat the frame with a hair dryer while trying to twist-tap them 

out. If that were to fail, I would drill them with a somewhat smaller drill 

than their OD. Either way, new inserts would have to be purchased. Someone 

else must have had this problem. Wait to find out what they did.



Vaughn

N914VA, Stalled, but not in a spin.



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wdaniell(at)etb.net.co
Guest

Posted: Thu Apr 03, 2008 12:47 pm Post subject: Mod 72 Debacle

I have the same problem and was waiting to see what happened.



Mine are up against the LG mounting frame of my trigear.



It is possible to simple mount them without the etching primer?



Will

Checked by AVG. 

16:14

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budyerly(at)msn.com
Guest

Posted: Thu Apr 03, 2008 3:28 pm Post subject: Mod 72 Debacle

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->  Don't cut them off.

  

 The etching primer is thick enough that you lost the clearances for a slip  fit.  During the assembly you probably scrapped the paint enough to  cause galling (or little paint rolls) which has locked it up.

  

 Clean off the primer, I would use a spray of acetone to clean the inside of  the tube from the rear.  That will loosen the paint up.  Use a fine  tip heat gun and heat the frame only where the interference is.  Etching  primer gets soft at about 200F (just to a sizzle when water put on it is  enough).  That will not hurt the tubing or firewall.  Remove the heat  and use alcohol to cool the insert then tap again.  If it moves in go ahead  and try to move it in further or make an extraction tool.

  

 I made the same mistake on one aircraft and had to put a painfully long  screw (5/16 inch with a washer head ground to fit) inside the gear frame  tube but large enough to catch the insert wall.  I then borrowed a  slide hammer to extract the insert.  Lucky for me it was only in about an  inch.  But it still requires removing the bolts from the frame, machining a  bolt head which will fit your slide hammer, replace the frame bolts, and then  heating the stupid thing, cooling the insert and then pull it out.

  

 Now I just ream, squirt with zinc chromate or the Corrosion X (ACP or ACF  50) and tap it in wet and recoat front and rear to seal it  in.  If you put primer on both the parts and let it dry, make the paint  thin and use the ACF 50 as a lube as well as for anticorrosion.

  

 Hope it helps.

  

 Bud Yerly, 

 Custom Flight Creations.

  

  

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hagargs(at)earthlink.net
Guest

Posted: Thu Apr 03, 2008 6:30 pm Post subject: Mod 72 Debacle

I was anticipating this when I started so I drilled and tapped  the inside

bores before I inserted them.  That way I could insert a threaded rod and

put a slide hammer on the sleeve and pull it out.  Everything worked fine

however.  I don't know what the wall thickness of the sleeves you have is

but I  made sure mine was thick enough to accept a good sized thread.  You

really don't want to have a bunch of stress built up inside your motor

mount tubes. You don't want to split them. When I put mine in they slipped

in about a  quarter of  the way and took about 5 wraps with a rubber mallet

to seat.



Steve Hagar 

A143

Mesa AZ

 	  Quote: 	
		   [Original Message]

 From: William Daniell <wdaniell(at)etb.net.co>

 To: <europa-list(at)matronics.com>

 Date: 4/3/2008 1:55:43 PM

 Subject: RE: Mod 72 Debacle



 



 I have the same problem and was waiting to see what happened.



 Mine are up against the LG mounting frame of my trigear.



 It is possible to simple mount them without the etching primer?



 Will

 Checked by AVG. 

 16:14

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litesellme(at)yahoo.com
Guest

Posted: Sun Apr 06, 2008 6:25 pm Post subject: Mod 72 Debacle

Bud,

  I have the intercoolers done. Take a look at my web sight under page Europa. I took the pictures with a higher quality camera. Tell me what you think. See if you can drum up some interest.

  Jason



ALAN YERLY <budyerly(at)msn.com> wrote:

  [quote]      <?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]-->    Don't cut them off.

   

  The etching primer is thick enough that you lost the clearances for a slip fit.  During the assembly you probably scrapped the paint enough to cause galling (or little paint rolls) which has locked it up.

   

  Clean off the primer, I would use a spray of acetone to clean the inside of the tube from the rear.  That will  loosen the paint up.  Use a fine tip heat gun and heat the frame only where the interference is.  Etching primer gets soft at about 200F (just to a sizzle when water put on it is enough).  That will not hurt the tubing or firewall.  Remove the heat and use alcohol to cool the insert then tap again.  If it moves in go ahead and try to move it in further or make an extraction tool.

   

  I made the same mistake on one aircraft and had to put a painfully long screw (5/16 inch with a washer head ground to fit) inside the gear frame tube but large enough to catch the insert wall.  I then borrowed a slide hammer to extract the insert.  Lucky for me it was only in about an inch.  But it still requires removing the bolts from the frame, machining a bolt head which will fit your slide hammer, replace the frame bolts, and then heating the stupid thing, cooling the insert and then pull it out.

    

  Now I just ream, squirt with zinc chromate or the Corrosion X (ACP or ACF 50) and tap it in wet and recoat front and rear to seal it in.  If you put primer on both the parts and let it dry, make the paint thin and use the ACF 50 as a lube as well as for anticorrosion.

   

  Hope it helps.

   

  Bud Yerly, 

  Custom Flight Creations.

   

   

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ptag.dev(at)tiscali.co.uk
Guest

Posted: Mon Apr 07, 2008 12:17 am Post subject: Mod 72 Debacle

Hi! Jason   

I have a Bell Intercooler fitted and I’m interested in your Intercooler Installation but can’t find your web site as indicated below. Would you please mail me it direct to:-  

   

ptag.dev(at)tiscali.co.uk (Ptag.dev(at)tiscali.co.uk)   

   

Also have you, or will you be making any provision anti carb ice?   The lowest carb throat temp. I have recorded during a rapid  decent, engine idling,  from 4,000ft (ground ambient 11deg Centigrade ) is 6 deg C.  However we in the UK have very low humidity conditions in winter.   

   

Regards  

Bob Harrison. G-PTAG  

Do not archive.  

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