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Cont. C-145 lifter body, end geometry

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n4546v(at)mindspring.com
Guest

Posted: Mon Jun 09, 2008 9:36 am Post subject: Cont. C-145 lifter body, end geometry

Hello all:

  

 We're overhauling a C-145 Cont. in our EAA  affiliated Flying Club airplane.

  

 Our Lifter bodies (cam followers?) are in near  perfect shape including the faces which engage the cam.

  

 We want to just lightly touch the lifter faces for  renewal.

  

 Could someone please advise what coarseness (grit?)  of stone or wheel would be appropriate for this?

  

 We have run a dial indicator over the face and it  is not flat.  The center of the face is 3 to 5 thousandths higher than the  edge.

  

 This appears to be a straight, rather than radius  (concave?) cut across the lifter face.  Do we have that right?

  

 Can anyone advise what are the Continental  specifications for renewing the lifter face?  Angles etc.

  

 We have a lot of machine shop capability.  Any  help is greatly appreciated.

  

 Regards,

  

 Randy, Las Vegas

  

 Chapter 163 flying club.

   [quote][b]

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Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Mon Jun 09, 2008 2:52 pm Post subject: Cont. C-145 lifter body, end geometry

You need someone that knows what they are doing. Regular engine

shops/repair stations such as One Stop or Lycon in CA can do a fine

job for you on inspecting/machining/certifying the major parts you

want to reuse.



On Mon, Jun 9, 2008 at 10:30 AM, Randy L. Thwing <n4546v(at)mindspring.com> wrote:

 	  Quote: 	
		   Hello all:



 We're overhauling a C-145 Cont. in our EAA affiliated Flying Club airplane.



 Our Lifter bodies (cam followers?) are in near perfect shape including the

 faces which engage the cam.



 We want to just lightly touch the lifter faces for renewal.



 Could someone please advise what coarseness (grit?) of stone or wheel would

 be appropriate for this?



 We have run a dial indicator over the face and it is not flat.  The center

 of the face is 3 to 5 thousandths higher than the edge.



 This appears to be a straight, rather than radius (concave?) cut across the

 lifter face.  Do we have that right?



 Can anyone advise what are the Continental specifications for renewing the

 lifter face?  Angles etc.



 We have a lot of machine shop capability.  Any help is greatly appreciated.



 Regards,



 Randy, Las Vegas



 Chapter 163 flying club.

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

archie97(at)earthlink.net
Guest

Posted: Mon Jun 09, 2008 4:14 pm Post subject: Cont. C-145 lifter body, end geometry

Those surfaces are originally ground, at I believe,  a 3deg angle 

 to facilitate rotation. I have a fully equipped  racing engine shop, 

 but normally send them out to a shop already set up  to do them.

 Cheaper than doing them ourselves.

 Archie

 [quote]   ---

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MONTY(at)bpaengines.com
Guest

Posted: Wed Jun 11, 2008 7:15 am Post subject: Cont. C-145 lifter body, end geometry

Do NOT grind a conical taper on the lifters.  They are ground with a 30 inch spherical radius.  If they are not pitted I would not touch them with anything except assembly lube.  If they have any pitting whatsoever they should be replaced and the camshaft ground.  Aircraft Specialties Services in Tulsa does excellent work.  Their phone is  

918-836-6872.  

   

Monty Barrett  

Barrett Precision Engines, Inc.  

   

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