Kirby Morgan 77
so that it does not leak. This may feel a bit snug out of the water, but should be comfortable underwater.
If you have a neoprene neck dam, it may also need to be stretched for it to fit properly. Trim the neck dam until it is still snug, then stretch it by sliding it over a scuba tank and allowing it to sit overnight. If you still cannot get the proper fit by stretching the neck dam, it must be trimmed further. Do not trim more than 1/4 inch at a time.
Trimming the neck dam.
As the neoprene neck dam ages, it will become looser, due to a natural breakdown of the cells. This is particularly true if the helmet is locked in and out of a bell or saturation system. As the neck dam becomes worn it will need replacement to ensure that it seals properly.
3.4.3 Adjusting the Neck Pad
Another component that controls the fit of the Kirby Morgan helmet is the adjustable neck pad. The neck pad, which is mounted on the locking collar, slides back and forth along the locking collar body for adjustment to fit different divers. Two screws and adjustment nuts lock the neck pad plate to the locking collar. Loosening these screws from the mount nuts allows the neck pad to be adjusted.
CAUTION
Avoid trimming neoprene neck dams too much. Neoprene neck dams will loosen over time as they are used and the cells of the foam neoprene break down. If you trim the neck dam too much it will be too loose and will leak. Trim the neck dam until it is snug, then stretch it before use.
The following procedure requires a diver and tender. You do not need to have the air on to the helmet if you do not use the neck dam ring assembly. If the neck dam assembly is used, the diver must have air to the helmet to breathe.
With the helmet face down on a suitable surface, pull and turn each of the sealed pull pins until they are locked open. Swing the locking collar/neck pad as-
Washer | Nut | Adjustment nut |
Teflon |
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Washer |
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Washer | Locking collar |
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Hinge bolt | Washer |
Screw
Locking Collar components. | |
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Neck pad
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