Light & Motion BLUEFIN HC7 - Manual (Page 28)

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O-ring Care & Maintenance
O-rings are the critical component that keeps water out of the housing. Routinely
inspect O-rings and replace at least once a year. If your O-rings are damaged, contact
the Light & Motion service department for an O-ring replacement kit.
Follow these steps for proper O-ring function.
1. The sealing system used on the rear plate incorporates two O-rings. This is the most
critical area of the housing for maintenance and should be inspected before every dive.
2. Make sure the rear plate O-rings and the mating surface on the inside of the main
housing are free of grit, hair, lint and anything that could breach the O-ring seal.
3. After frequent diving or if O-rings appear dirty, remove O-rings and clean the grooves.
To remove O-rings, use finger pressure or the rounded edge of a plastic card to lift the
O-ring out of the groove.
Note: Never use a metal object to remove an O-ring. It will
cause damage to the O-ring and mating surface.
4. To check O-rings for damage, place the O-ring between the index finger and thumb.
Then pull the O-ring through your fingers, feeling for any debris or wear.
5. If O-rings are dirty, it is best to replace them. Washing dirty O-rings with soap and
water is not recommended. Soap breaks down the lubricants and will compromise the
integrity of the seal.
6. Properly greased O-rings will help maintain sealing integrity and minimize O-ring
degradation. Use enough grease to lubricate the O-ring thoroughly, but not so much
that it will attract additional debris.
7. Clean the groove with a lint free swab or the folded edge of a paper towel.
8. All of the front optic ports for the housing also utilize two O-ring seals. Also check
these seals every time the optic is removed.
(Fig. 30) (Fig. 31)