Flowserve Pac-Seal Type 21 - Manual (Page 5)

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2.4 Lubricate inner diameter (ID) of the rotating seal head elastomer
bellows with Pac-Ease. Note: For smaller diameter seals it may be
easier to lubricate the shaft.
2.5 Clean both rotating and stationary seal faces with a lint free rag
and isopropyl alcohol. Note: Any oil, grease, assembly lubricant,
fingerprints, or other residue from the installation process can cause
the seal to leak.
2.6 Slide the rotating seal head by hand along the shaft to a completely
parallel contact with the stationary seat. Apply pressure to the
back of the metal shell and elastomer bellows. Applying pressure
to both metal shell and elastomer bellows is important to minimize
stretching of bellows on the shaft relative to rotating seal head.
Avoid extreme installation pressure or hammering of the seal.
2.6.1 For back-first installations apply pressure to the outer
diameter of the seal. Whenever possible even pressure
should be applied to the outer diameter of the seal face,
bellows, and outer shell to provide proper installation.
Care should be taken not to apply pressure directly to
the sealing surface of the seal face to avoid any possible
damage. Press the assembly until the back side of the
spring (or spring retainer if applicable) is flush and parallel
to the equipment. Clean both rotating and stationary seal
faces with a lint free rag and isopropyl alcohol. Note: Any
oil or grease on the seal faces may cause the seal to leak.
2.7 Install spring and spring retainer (if applicable) over shoulder of
metal outer shell. Make sure spring correctly engages shoulder of
seal head and impeller shoulder or spring shaft retainer.