Today's Message Index:
----------------------
1. 12:45 PM - Peculiar note in Lycoming SI 1060R (Pushrod Identification) (Tim Lewis)
2. 05:39 PM - Re: Peculiar note in Lycoming SI 1060R (Pushrod Identification) (FLYaDIVE)
3. 05:50 PM - Re: Peculiar note in Lycoming SI 1060R (Pushrod Identification) (Kelly McMullen)
Message 1
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| Subject: | Peculiar note in Lycoming SI 1060R (Pushrod Identification) |
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rods with superseded part numbers of the same length.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rods with new part numbers and push rods with a superseded part number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
--
Tim Lewis -- HEF (Manassas, VA)
A&P
RV-6A N47TD -- 1104 hrs - sold
RV-10 N31TD -- 1000 hrs
Message 2
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| Subject: | Re: Peculiar note in Lycoming SI 1060R (Pushrod |
Identification)
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superseded part number of different lengths can be used in the same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@comcast.net> wrote:
> TimRVator@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 rods with superseded part numbers of the same length.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 new part numbers and push rods with a superseded part number of different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
>
> --
> Tim Lewis -- HEF (Manassas, VA)
> A&P
> RV-6A N47TD -- 1104 hrs - sold
> RV-10 N31TD -- 1000 hrs
>
>
Message 3
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| Subject: | Re: 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:
> 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@comcast.net
> <mailto:TimRVator@comcast.net>> wrote:
>
> <TimRVator@comcast.net <mailto:TimRVator@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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