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Cont. C-145 lifter body, end geometry

 
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n4546v(at)mindspring.com
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PostPosted: Mon Jun 09, 2008 9:36 am    Post subject: Cont. C-145 lifter body, end geometry Reply with 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



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

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

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
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archie97(at)earthlink.net
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PostPosted: Mon Jun 09, 2008 4:14 pm    Post subject: Cont. C-145 lifter body, end geometry Reply with quote

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
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MONTY(at)bpaengines.com
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PostPosted: Wed Jun 11, 2008 7:15 am    Post subject: Cont. C-145 lifter body, end geometry Reply with quote

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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