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Peculiar note in Lycoming SI 1060R (Pushrod Identification)

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

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

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 a superseded part number of different lengths can be used in the same 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     push rods with superseded part numbers of the same length.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     superseded part number of different lengths can be used in the same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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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

TimRVator(at)comcast.net
Guest

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

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
Guest

Posted: Tue Jan 30, 2018 2:10 pm Post subject: Peculiar note in Lycoming SI 1060R (Pushrod Identification)

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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