Kongsberg M3 Sonar FLS, Installation Manual

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Replacing the retaining ring in a dummy plug
If your Sonar Head has ports that are not in use, then a dummy sealing plug will be installed
to waterproof the port during submersion. When installing (or removing) the M3 Sonar
FLS, check if the retaining ring is damaged or missing — especially if you have been using
your M3 Sonar FLS in the field. The retaining ring is a small steel part that can break
over a prolonged period through corrosion.
Prerequisites
The following tools and parts are used when replacing the retaining ring.
• Dummy sealing plug
• Replacement retaining ring (can be ordered from Kongsberg Mesotech)
• You will need a pair of retaining-ring pliers.
Context
If the retaining ring (A) breaks off the dummy sealing
plug, there will be nothing preventing the engaging
nut (B) from being lost, and possibly compromising
the effectiveness of the dummy plug when removing
it from the mating connector. If the engaging nut does
come off, ensure that the two engaging nut washers
behind the nut do not come off as well. You will need
to replace these washers if they go missing.
Note
If the retaining ring breaks off a SEA CON ® cable
connected to the Sonar Head, do not attempt to
replace it yourself. You cannot install the retaining
ring without removing the cable connector. Losing
the retaining ring on your cable does not pose any
serious risk of equipment damage, although you may
need to pull on the cable connector to disconnect it after unscrewing the engaging nut.
You can leave the dummy sealing plug attached to the Sonar Head during the replacement
procedure. If it is easier for you to remove the plug, make sure to securely fasten it again
afterwards.
Procedure
1 Remove the damaged retaining ring from the dummy plug.
M3 Sonar FLS Installation Manual