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charset=utf-8 Content-Transfer-Encoding: quoted-printable Without enlarging the drain line, the internal pressure in the gearbox will b= e in the range of 2 to 4 psi and applied to the input shaft seal even with a= groove cut in the mount plate. Steve Boese > On Apr 30, 2021, at 8:45 AM, Finn Lassen finn.lassen@verizon.net wrote: >=20 > =EF=BB=BF > =E2=97=86 This message was sent from a non-UWYO address. Please exercise c= aution when clicking links or opening attachments from external sources. >=20 >=20 > For what it's worth, I had a leaking input shaft oil seal. Possibly from b= ad installation (bore badly scratched). > I tried to polish out scratches along the shaft (no clue how they came abo= ut), but still visible. > On Tracy's recommendation I cut a small groove in the mount plate to preve= nt any pressure build-up behind the input shaft thrust bearing. (The factory= groove in the input shaft, that supplies the thrust bearing with oil, varie= s from shaft to shaft and was not under Tracy's control.) =20 > I installed a double-lipped SK9862 oil seal. > So far no more leak! >=20 > But the point is that you can eliminate pressure build-up behind the thrus= t bearing that might want to force out the oil seal by cutting a small grove= in the mount plate, providing a path for the oil to return. >=20 > Hand cut with a dremel. Not pretty, really wanted it deeper than wide. >=20 > BTW, I'm using the mount plate from my old (crashed) RV-3. The one I got w= ith the drive from the Cozy-girls had starter position in wrong place and de= signed to bolt to a engine mount plate under the engine. >=20 > Finn >=20 >> On 4/30/2021 2:00 AM, Sboese sboese@uwyo.edu wrote: >> Neil, >>=20 >> With a -6 drain line to the crankcase, air that was initially inside the g= earbox is mixed with the oil and this mixture is forced out the drain by an e= qual volume of pure oil coming in. Eventually all the air is eliminated and= the gearbox is completely filled with oil. An RD (Tracy Crook) redrive fit= ted with a -10 (5/8=E2=80=9D) id drain and a vent from the upper part of the= redrive to the upper part of the crankcase will not fill up with oil and on= ly have crankcase pressure inside. >>=20 >> Steve Boese=20 >>=20 >>> On Apr 29, 2021, at 4:25 PM, flyrotary@lancaironline.net wrote: >>>=20 >>> =EF=BB=BFMat, >>> Oil into the redrive is needed mainly for lubrication an= d also heat transfer. Very little is needed as lubrication needs little wit= h oils these days. It appears that In most cases the redrive actually fills= and does not drain readily. Why I do not know. This puts pressure on the s= eals back and front, which suggests it may be beneficial to hold both seals i= n with small screws to prevent them getting pushed out. Screws are good ins= urance as in flight a detached seal could ruin a good day. >>>=20 >>> Neil. >>>=20 >>> =20 >>>=20 >=20 >=20 >=20 > =09 > This email has been checked for viruses by Avast antivirus software.=20 > www.avast.com >=20 >=20 > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List= .html --Apple-Mail-2436D0A0-5FFA-4808-A0A0-9074278DB9BC Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Without enlarging the drain line, the internal pres= sure in the gearbox will be in the range of 2 to 4 psi and applied to the i= nput shaft seal even with a groove cut in the mount plate.

Steve Boese


On Apr= 30, 2021, at 8:45 AM, Finn Lassen finn.lassen@verizon.net <flyrotary@la= ncaironline.net> wrote:

=EF=BB=BF

=E2=97=86 This message= was sent from a non-UWYO address. Please exercise caution when clicking li= nks or opening attachments from external sources.


For what it's worth, I had a leaking input s= haft oil seal. Possibly from bad installation (bore badly scratched).
I tried to polish out scratches along the shaft (no clue how they came abou= t), but still visible.
On Tracy's recommendation I cut a small groove in the mount plate to preven= t any pressure build-up behind the input shaft thrust bearing. (The factory= groove in the input shaft, that supplies the thrust bearing with oil, vari= es from shaft to shaft and was not under Tracy's control.) 
I installed a double-lipped SK9862 oil seal.
So far no more leak!

But the point is that you can eliminate pressure build-up behind the thrust= bearing that might want to force out the oil seal by cutting a small grove= in the mount plate, providing a path for the oil to return.

Hand cut with a dremel. Not pretty, really wanted it deeper than wide.

BTW, I'm using the mount plate from my old (crashed) RV-3. The one I got wi= th the drive from the Cozy-girls had starter position in wrong place and de= signed to bolt to a engine mount plate under the engine.

Finn

On 4/30/2021 2:00 AM, Sboese sboese@uwyo.edu wrote:
Neil,

With a -6 drain line to the crankcase, air that was initially inside t= he gearbox is mixed with the oil and this mixture is forced out the drain b= y an equal volume of pure oil coming in.  Eventually all the air is el= iminated and the gearbox is completely filled with oil.  An RD (Tracy Crook) redrive fitted with a -10 (5/8= =E2=80=9D) id drain and a vent from the upper part of the redrive to the up= per part of the crankcase will not fill up with oil and only have crankcase= pressure inside.

Steve Boese 

On Apr 29, 2021, at 4:25 PM, flyrotary@lancaironline.net wrote:

=EF=BB=BFMat,

     &= nbsp;          Oil into the re= drive is needed mainly for lubrication and also heat transfer.  Very l= ittle is needed as lubrication needs little with oils these days.  It = appears that In most cases the redrive actually fills and does not drain readily.  Why I do not know.  This puts= pressure on the seals back and front, which suggests it may be beneficial = to hold both seals in with small screws to prevent them getting pushed out.=   Screws are good insurance as in flight a detached seal could ruin a good day.

Neil.

 




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