REFLECTOR: A lot more on crankshaft seals and venting

[Laurence Coen]

Yes, he cut the seal and I saw him do it.  All seals have a removable spring which he removed before cutting the seal and then reinstalled.  The correct procedure for installing the seal is to remove the spring, then stretch the seal over the prop hub and if you wait about 5 minutes it will relax into it's original diameter and then you replace the spring and glue it in place.  For further details contact Lycoming.

Larry Coen
N136LC


From: Burrall L Sanders 
Sent: Sunday, September 29, 2013 1:21 PM
To: Jeff Barnes ; Velocity Aircraft Owners and Builders list 
Subject: Re: REFLECTOR: A lot more on crankshaft seals and venting


Are you sure he cut the seal?   One type of seal is the split seal, which is split with a removable spring that you install after the seal is  in place around the crank but before it is slid into the crankcase bore.

From: Laurence Coen 
Sent: Sunday, September 29, 2013 11:28 AM
To: Jeff Barnes ; Velocity Aircraft Owners and Builders list 
Subject: Re: REFLECTOR: A lot more on crankshaft seals and venting

This is my personal experience with Lycoming crankshaft seals.  This is on a Cherokee 180D, O360.  The crank was seeping oil and we had an AP replace the seal.  He removed the spring and CUT the seal to install it on the crankshaft.  Then he replaced the spring and installed it into the seal recess with ply-o-bond.  Some months latter I discovered that the seal not only came out  it was completely missing.  The surprising thing was that there was no more oil loss than when the original worn oil seal was in place.  I replaced the seal using the correct procedure of stretching it over the prop flange and glued it in with permatex #2.  No more problems.  The take away is that if you lose all your oil on a single flight because you lost your crank seal, then something else is terribly wrong.

Larry Coen
N136LC

From: Jeff Barnes 
Sent: Saturday, September 28, 2013 9:28 PM
To: Sportair 
Cc: Velocity Reflector ; canard-aviators 
Subject: REFLECTOR: A lot more on crankshaft seals and venting

Whoa, 

  Great thread. http://tugantek.com/cozylinks/NNLS/Engines/nlCaseSealsVenting.php

  Just in time for fall/winter season. 

Regards,

Jeff Barnes
847-331-2567


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