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Peculiar note in Lycoming SI 1060R (Pushrod Identification)

 
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Kellym



Joined: 10 Jan 2006
Posts: 1598
Location: Sun Lakes AZ

PostPosted: Mon Jan 29, 2018 5:50 pm    Post subject: Peculiar note in Lycoming SI 1060R (Pushrod Identification) Reply with quote

I have no answer as to what the concern is. Differing lengths are
normally not an issue as long as the dry tappet clearance is within the
.028 to .080 spec.

On 1/29/2018 6:36 PM, FLYaDIVE wrote:
Quote:
Yea, Tim:

GREAT QUESTION!

Whom ever wrote up the SI did a poor job as you pointed out. They did
not explain WHY!
Also, reading this:  "Push rods with new part numbers and push rods with
a superseded part number of different lengths can be used in the same
cylinder."
HOW MUCH of a difference is allowed?  OK...  So if the difference is
0.001" is that acceptable?
Looks like we have to write back to Lycoming and get a Revision to this SI!

Barry

On Mon, Jan 29, 2018 at 3:43 PM, Tim Lewis <TimRVator(at)comcast.net
<mailto:TimRVator(at)comcast.net>> wrote:


<TimRVator(at)comcast.net <mailto:TimRVator(at)comcast.net>>

Lycoming's recently released Service Instruction 1060R
(https://www.lycoming.com/content/service-instruction-no-1060-R
<https://www.lycoming.com/content/service-instruction-no-1060-R>)
has a new note:

"Do not use push rods with new part numbers in the same cylinder as
push rods with superseded part numbers of the same length. (For
example: do not use P/Ns 15F28835-17 and 15F19957-17 in the same
cylinder.) Push rods with new part numbers and push rods with a
superseded part number of different lengths can be used in the same
cylinder."

Why would Lycoming prohibit using two pushrods of the same length
with different part numbers in the same cylinder?  I don't see how
it would matter.

Tim

--
Tim Lewis -- HEF (Manassas, VA)
A&P
RV-6A N47TD -- 1104 hrs - sold
RV-10 N31TD -- 1000 hrs



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PostPosted: Tue Jan 30, 2018 1:30 pm    Post subject: Peculiar note in Lycoming SI 1060R (Pushrod Identification) Reply with quote

I called Lycoming to ask.  Mark (tech support) said he thinks the reason
is that the ball ends on the old and new part numbers are a little
different, and they want to prevent someone from accidentally swapping
intake rod for exhaust rod on a cylinder, and thereby risk having a dry
tappet clearance problem.

--

Tim Lewis -- HEF (Manassas, VA)
A&P
RV-6A N47TD -- 1104 hrs - sold
RV-10 N31TD -- 1000 hrs

Tim Lewis wrote on 1/29/2018 3:43 PM:
Quote:

<TimRVator(at)comcast.net>

Lycoming's recently released Service Instruction 1060R
(https://www.lycoming.com/content/service-instruction-no-1060-R) has a
new note:

"Do not use push rods with new part numbers in the same cylinder as
push rods with superseded part numbers of the same length. (For
example: do not use P/Ns 15F28835-17 and 15F19957-17 in the same
cylinder.) Push rods with new part numbers and push rods with a
superseded part number of different lengths can be used in the same
cylinder."

Why would Lycoming prohibit using two pushrods of the same length with
different part numbers in the same cylinder?  I don't see how it would
matter.

Tim



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stuart(at)stuarthutchison
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PostPosted: Tue Jan 30, 2018 2:10 pm    Post subject: Peculiar note in Lycoming SI 1060R (Pushrod Identification) Reply with quote

Thanks Tim.

“A little different” ... to my knowledge they haven’t also changed rockers (thereby rocker sockets), so I take it this means there might not be oil holes on the new intake pushrod ball ends. Oil pressure comes through the hydraulic lifters, through the pushrod, through the rocker body (different for exhaust valves) to the exhaust valve stem and guide. Much worse than a dry tappet clearance problem, depriving the valve of oil would be a disaster, so good call Lycoming, but why not make the reasons clear?! It’s hard to get good help these days 🙄

Kind Regards, Stu

Sent from my iPhone

Quote:
On 31 Jan 2018, at 08:30, Tim Lewis <TimRVator(at)comcast.net> wrote:



I called Lycoming to ask. Mark (tech support) said he thinks the reason is that the ball ends on the old and new part numbers are a little different, and they want to prevent someone from accidentally swapping intake rod for exhaust rod on a cylinder, and thereby risk having a dry tappet clearance problem.

--

Tim Lewis -- HEF (Manassas, VA)
A&P
RV-6A N47TD -- 1104 hrs - sold
RV-10 N31TD -- 1000 hrs

Tim Lewis wrote on 1/29/2018 3:43 PM:
>
>
> Lycoming's recently released Service Instruction 1060R (https://www.lycoming.com/content/service-instruction-no-1060-R) has a new note:
>
> "Do not use push rods with new part numbers in the same cylinder as push rods with superseded part numbers of the same length. (For example: do not use P/Ns 15F28835-17 and 15F19957-17 in the same cylinder.) Push rods with new part numbers and push rods with a superseded part number of different lengths can be used in the same cylinder."
>
> Why would Lycoming prohibit using two pushrods of the same length with different part numbers in the same cylinder? I don't see how it would matter.
>
> Tim
>








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