Today's Message Index:
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1. 01:30 PM - Re: Peculiar note in Lycoming SI 1060R (Pushrod Identification) (Tim Lewis)
2. 02:10 PM - Re: Peculiar note in Lycoming SI 1060R (Pushrod Identification) (iiNet)
3. 02:23 PM - Re: Peculiar note in Lycoming SI 1060R (Pushrod Identification) (FLYaDIVE)
4. 04:19 PM - Re: Peculiar note in Lycoming SI 1060R (Pushrod Identification) (iiNet)
Message 1
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| Subject: | Re: 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:
> <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 push rods with superseded part numbers of the same length.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 superseded part number of different lengths can be used in the same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
>
Message 2
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| Subject: | Re: Peculiar note in Lycoming SI 1060R (Pushrod |
Identification)
Thanks Tim.
A little different ... to my knowledge they havent 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?! Its hard to get good help these days
Kind Regards, Stu
Sent from my iPhone
> On 31 Jan 2018, at 08:30, Tim Lewis <TimRVator@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
>>
>
>
>
>
>
>
Message 3
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| Subject: | Re: Peculiar note in Lycoming SI 1060R (Pushrod |
Identification)
Stu:
You bring up a good point about the difference between the Exhaust and
Intake Rockers.
The difference is the direction the oil squirts out.
On the EXHAUST it squirts ONTO the Exhaust Valve.
On the INTAKE it squirts AWAY from the Intake Valve.
MANY an Engine Rebuilding Shop and Lycoming themselves have mixed up the
rockers.
If the oil does not squirt onto the Exhaust vale you will have coking on
the valve and in the guide.
There is a SB or SI that allows you to REPLACE the INTAKE Rocker with an
Exhaust Rocker.
I have been doing this for YEARS! Engine runs cooler and NO chance of
mixing up the rockers.
Barry
On Tue, Jan 30, 2018 at 5:10 PM, iiNet <stuart@stuarthutchison.com.au>
wrote:
> stuart@stuarthutchison.com.au>
>
> Thanks Tim.
>
> =9CA little different=9D ... to my knowledge they haven
=99t 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 (differen
t
> 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
=99s
> hard to get good help these days =F0=9F=99=84
>
> Kind Regards, Stu
>
> Sent from my iPhone
>
> > On 31 Jan 2018, at 08:30, Tim Lewis <TimRVator@comcast.net> wrote:
> >
> TimRVator@comcast.net>
> >
> > I called Lycoming to ask. Mark (tech support) said he thinks the reaso
n
> 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:
> 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
> >>
> >
> >
> >
> >
> >
> >
>
===========
===========
===========
===========
===========
>
>
Message 4
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| Subject: | Re: Peculiar note in Lycoming SI 1060R (Pushrod |
Identification)
Excellent news Barry! I took that chance when I rebuilt my narrow deck IO-54
0 in Dec 2010 by putting exhaust rockers on the intake side as well. My old i
ntake rockers had no oil jets at all. I figured it couldn=99t hurt and
the intent was to increase oil flow to the heads to keep CHTs as low as pos
sible. Prop governor oil pressure is also robbed from the RHS oil gallery an
d apparently that=99s the side most sticky valves occur, most noticeab
le with rough running on startup until the valve guides expand. Unfortunate
ly, Lycomings hydraulic lifters were designed to be vertical and to remain f
ull of oil (per their automotive engines) and the design isn=99t parti
cularly suited to horizontal use.
Kind Regards, Stu
Sent from my iPhone
> On 31 Jan 2018, at 09:23, FLYaDIVE <flyadive@gmail.com> wrote:
>
> Stu:
>
> You bring up a good point about the difference between the Exhaust and In
take Rockers.
> The difference is the direction the oil squirts out.
> On the EXHAUST it squirts ONTO the Exhaust Valve.
> On the INTAKE it squirts AWAY from the Intake Valve.
> MANY an Engine Rebuilding Shop and Lycoming themselves have mixed up the r
ockers.
> If the oil does not squirt onto the Exhaust vale you will have coking on t
he valve and in the guide.
> There is a SB or SI that allows you to REPLACE the INTAKE Rocker with an E
xhaust Rocker.
> I have been doing this for YEARS! Engine runs cooler and NO chance of mi
xing up the rockers.
>
> Barry
>
>> On Tue, Jan 30, 2018 at 5:10 PM, iiNet <stuart@stuarthutchison.com.au> wr
ote:
.com.au>
>>
>> Thanks Tim.
>>
>> =9CA little different=9D ... to my knowledge they haven
=99t also changed rockers (thereby rocker sockets), so I take it this means t
here might not be oil holes on the new intake pushrod ball ends. Oil pressur
e comes through the hydraulic lifters, through the pushrod, through the rock
er body (different for exhaust valves) to the exhaust valve stem and guide. M
uch worse than a dry tappet clearance problem, depriving the valve of oil wo
uld be a disaster, so good call Lycoming, but why not make the reasons clear
?! It=99s hard to get good help these days =F0=9F=99=84
>>
>> Kind Regards, Stu
>>
>> Sent from my iPhone
>>
>> > On 31 Jan 2018, at 08:30, Tim Lewis <TimRVator@comcast.net> wrote:
>> >
t.net>
>> >
>> > I called Lycoming to ask. Mark (tech support) said he thinks the reaso
n is that the ball ends on the old and new part numbers are a little differe
nt, and they want to prevent someone from accidentally swapping intake rod f
or 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:
st.net>
>> >>
>> >> Lycoming's recently released Service Instruction 1060R (https://www.ly
coming.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 pu
sh rods with superseded part numbers of the same length. (For example: do no
t 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 l
engths 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 matt
er.
>> >>
>> >> Tim
>> >>
>> >
>> >
>> >
>> >
>> >
>> >
>>
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