Leaking Tach Drive Seal

[Eric_Anderson]

My tach drive began leaking a couple of weeks ago. I can live with it for now as the leak is very slight. But eventually it will need some work. I've heard that it is tough to replace. Has anyone tried? Also an hour of searching has yielded the following parts (Lycoming io-360 on a Pitts):

531378 OIL TACH DRIVE SEAL

and

641533 TACH DRIVE SEAL

I'm assuming the second is correct because its more expensive

Thanks for any help

 

[DamoH]

 

[Eric_Anderson]

 

[Eric_Anderson]

 

[christopher]

 

[tferraro]

 

[Eric_Anderson]