I know this is an old thread, but it comes up on google a lot, and this thread seems to cover this subject in the most depth.
Would like to add this WE document to the thread:
http://etler.com/docs/WECo/Card%20Catalog/pdf/relays/relays,%20327,%202,%201979-08-31.pdf..as it describes the leaky relay in question.
From the description, it really seems like the "green goo" might indeed be a potting compound that liquifies, as WE
apparently went to some efforts in later revisions to remove the compound. According to the docs the contacts
are dry and sealed. Since it's a reed relay, typically the contacts are sealed in glass.
In case the above link describing the relay goes stale, I'm retyping what it states (not responsible for errors):
.............................................................................................
: AUGUST 31, 1979 | NO. 327 TYPE RELAYS | :
: | (Card No. 2) | :
: ___________________|__________________________________________________|__________________ :
: :
: No. 327A, F & G: Non-adjustable relays consisting of No. 237E dry sealed contacts :
: housed within a double winding coil contained in a metal case. :
: Arranged for mounting on a printed wiring board. :
: The two reeds in the sealed contact will make contact (operate) and release :
: when either winding of the coil is energized, at the values specified. :
: :
: No. 327B, C, D, E, M & N: Similar to No. 327A except each is equipped with one winding :
: and four terminals. :
: :
: No. 327H: Same as No. 327A except potting compound is eliminated. :
: Not approved for general use. Approval must be obtained from the Apparatus :
: Applications group. :
: :
: No. 327J: Same as No. 327C except potting compound eliminated. :
: Not approved for general use. Approval must be obtained from the Apparatus :
: Applications group. :
: :
: No. 327K: Similar to No. 327G except has a trifilar winding with the third winding :
: shorted internally for low AC impedance. :
: Contain No. 237H dry sealed contacts. :
: :
: No. 327L: Similar to No. 327F except contain No. 237H dry sealed contacts. :
: :
: No. 327P & R: Similar to No. 327B except have minimum board to relay clearance :
: of 0.55 inch, a height above board of 0.68 inch, and an overall height :
: of 0.82 inch; instead of 0.02 inch, 0.064 inch and 0.78 inch, respectively. :
: :
: Property of the Western Electric Company, Incorporated Printed in U.S.A :
: :
:............................................................................................
