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Matco brakes question

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Bill Strahan

Joined: 20 Aug 2008
Posts: 145

Posted: Sat Feb 23, 2013 11:34 am Post subject: Matco brakes question

I had a couple of the bolts that hold the disk on the wheel break recently.  I had the old style safety-wired bolts.



I ordered and received the upgraded wheels from Matco along with the new button head screws and washers.  Nick had told me to have a good quality hex driver and torque wrench, which I thought I had.  On the third bolt, the head easily stripped before 80 inch-lbs.   



Well, I have some of the previous cap head screws, and I'm curious if anyone sees a reason not to use one.  In fact, I'd rather have cap head screws all the way around.  These 1/8" drive button head screws are just too small in my opinion.  I don't want to be jacking with or worrying about this every time the wheels come off.



So, question 1:  Does anyone know why the switch to button head? 

Question 2:  Any reason not to stick with the cap head?

Question 3:  If I use the cap head will that work with the new Nord Lock washers, or just keep safety wiring?  (I'm somewhat partial to the safety wire, as it seems pretty fool proof.)



It's a gorgeous day in Dallas, and I want to go flying.  I must have done something wrong to someone to have a problem with the last bolt before putting wheel pants on and going.

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checkpoint2(at)centurylin
Guest

Posted: Sun Feb 24, 2013 5:14 am Post subject: Matco brakes question

I'm using Allen head cap screws with washers as supplied by MATCO a year 

ago.  no more separation on sand 1943 concrete runways.  Bob Haas

#41 N330BH



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barnett6088(at)msn.com
Guest

Posted: Sun Feb 24, 2013 12:27 pm Post subject: Matco brakes question

Bill 

I had the same problem with the Matco furnished button heads stripping out.  Matco sent some new ones but they were also soft.  I bought some button head screws identical to the Matco ones at ACE hardware.  They gave me no trouble torquing them to 80 inch pounds.  They have been holding the disks on for 150 hours with no trouble. Gary Barnett N335AL SN133

 



 	  Quote: 	
		   Subject: Matco brakes question

 From: bill(at)gdsx.com

 Date: Sat, 23 Feb 2013 11:34:34 -0800

 To: lightning-list(at)matronics.com

 

 --> Lightning-List message posted by: "Bill Strahan" <bill(at)gdsx.com>

 

 I had a couple of the bolts that hold the disk on the wheel break recently.  I had the old style safety-wired bolts.

 

 I ordered and received the upgraded wheels from Matco along with the new button head screws and washers.  Nick had told me to have a good quality hex driver and torque wrench, which I thought I had.  On the third bolt, the head easily stripped before 80 inch-lbs.   

 

 Well, I have some of the previous cap head screws, and I'm curious if anyone sees a reason not to use one.  In fact, I'd rather have cap head screws all the way around.  These 1/8" drive button head screws are just too small in my opinion.  I don't want to be jacking with or worrying about this every time the wheels come off.

 

 So, question 1:  Does anyone know why the switch to button head? 

 Question 2:  Any reason not to stick with the cap head?

 Question 3:  If I use the cap head will that work with the new Nord Lock washers, or just keep safety wiring?  (I'm somewhat partial to the safety wire, as it seems pretty fool proof.)

 

 It's a gorgeous day in Dallas, and I want to go flying.  I must have done something wrong to someone to have a problem with the last bolt before putting wheel pants on and going.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=394873#394873

 

 

 

 

 

 

&g===========
	


 	  Quote: 	
		   

 

 


	


 		 	   		  

  [quote][b]

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geather

Joined: 06 Feb 2008
Posts: 23
Location: Mt Hutton Australia

Posted: Sun Feb 24, 2013 1:27 pm Post subject: Matco brakes question

Bill,



Same problem early in my test program - brake disc separated and required a replacement wheel.



Matco confirmed that 80 inch pounds was the correct torque for the button head bolts. This seemed too tight to me, even though the originals (with Nord Lock washers) came loose. 



And like yourself, I did strip one head before 80 inch pounds when assembling the new wheel. Was lucky I had a spare bolt.



Current button head bolts with Nord Lock washers seem to be fine after about 30 hours flight time.



Cheers



Geoff Eather (Kit 127) Australia 



On 24/02/2013, at 6:34 AM, Bill Strahan wrote:



 	  Quote: 	
		   

 

 I had a couple of the bolts that hold the disk on the wheel break recently.  I had the old style safety-wired bolts.

 

 I ordered and received the upgraded wheels from Matco along with the new button head screws and washers.  Nick had told me to have a good quality hex driver and torque wrench, which I thought I had.  On the third bolt, the head easily stripped before 80 inch-lbs.   

 

 Well, I have some of the previous cap head screws, and I'm curious if anyone sees a reason not to use one.  In fact, I'd rather have cap head screws all the way around.  These 1/8" drive button head screws are just too small in my opinion.  I don't want to be jacking with or worrying about this every time the wheels come off.

 

 So, question 1:  Does anyone know why the switch to button head? 

 Question 2:  Any reason not to stick with the cap head?

 Question 3:  If I use the cap head will that work with the new Nord Lock washers, or just keep safety wiring?  (I'm somewhat partial to the safety wire, as it seems pretty fool proof.)

 

 It's a gorgeous day in Dallas, and I want to go flying.  I must have done something wrong to someone to have a problem with the last bolt before putting wheel pants on and going.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=394873#394873

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_________________
ge

wb2ssj(at)rochester.rr.co
Guest

Posted: Sun Feb 24, 2013 3:43 pm Post subject: Matco brakes question

Bill, I am sticking with the cap screws and safety wire.

Tex



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n5pb(at)AOL.COM
Guest

Posted: Sun Feb 24, 2013 6:46 pm Post subject: Matco brakes question

Bill, 

  I too received the new button head screws after MATCO service bulletin came out a couple of years ago.  I've not had any problem to  torque them to the 80 in Lbs.  Also, I have had the wheels off several times and each time I installed with new button head screws and washers without incident.

   

  Bear

   

   

  

  

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mark(at)flylightning.net
Guest

Posted: Mon Feb 25, 2013 6:32 am Post subject: Matco brakes question

To Bill and the list,



I forwarded Bill's questions to George Happ of MATCO Mfg and below is his

response. For clarification BHCS= Button Head Cap Screw. SHCS= Socket Head

Cap Screw.



He does not recommend using the Nordlocs with the SHCS so if you stay with

cap screws then you should use safety wire.



Hope this helps!



Mark



Mark,

The NordLoc washers do a better job of maintaining the preload in the bolts.

They require a larger diameter head than the socket head (SHCS) provides

hence the switch to the button head (BHCS).  We do not recommend their use

with the SHCS.



The BHCS will work fine at 80 in-lb with a good fitting allen head drive.



George R Happ

MATCO mfg

801-335-0582 801-335-0581 (F)

www.matcomfg.com

Technical Support Disclaimer: While we strive to ensure that the

advice/information provided through our support is correct, MATCO mfg does

not accept any responsibility for errors or omissions. Any advice or

information that MATCO mfg gives you via any form of communication is not a

guarantee that it will correct your problem. It is only offered as

assistance to you. 

MATCO mfg will not be held responsible for any loss or damage as a result of

our advice or information supplied.

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Bill Strahan

Joined: 20 Aug 2008
Posts: 145

Posted: Mon Feb 25, 2013 8:20 pm Post subject: Re: Matco brakes question

Yeah, George was super helpful when I called and chatted with him.  I would have called Matco directly on this point as well, but it was Saturday, and based on feedback I was hoping to still get to go flying.  



I looked more closely at the bolt that had the problem.   There is some material in the hex cutout that shouldn't be there, and that prevents the hex drive from fully seating.  I'd guess the driver can only engage about halfway, rather than bottoming out in the hole it hits the flash/metal sticking up on the inside and only partially engages.



I tried to get it with a pick, but it's not coming out.  It just looks like a manufacturing defect.  So I chunked that bolt and will be getting another.  All the other bolts went in fine to 80 in-lbs.

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