2640 tach drive oil leak

2640 is split for clutch. Tach
drive has leaked oil as long as I
have had tractor. It does have a
good bit of blow by so I know that
contributes to the issue. Have yet
to find any reference to a seal in
tech manual or parts site. Anti
know what is supposed to keep oil
from coming past tach drive?
 
there is usually a rubber washer used as a seal in the end of the tach cable to prevent oil leakage.
 
there is a rubber washer that goes in between the clutch housing and engine. the tach cable screws in against that washer when you put it back in the housing. my 3130 didn't have one and it also leaked until last month when I put a new clutch in it.
 

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