Humminbird 1157c Combo Installating And Operation Manual page 49

5. Coat the face of the transducer and the inside of the hull with epoxy.
6. Press the transducer into place with a slight twisting motion to purge any trapped air from
underneath, keeping the end of the transducer that has the mounting knuckle pointed forward,
towards the bow of the boat.
NOTE: Proper operation requires the end of the transducer that has the mounting knuckle to face towards
the bow of the boat.
7. Weight the transducer so that it will not move while the epoxy is curing.
NOTE: When the epoxy cures, no water is necessary inside the hull.
8. If you unplugged the transducer cable at the beginning of this procedure, plug it back into the
control head.
NOTE: Neither water, spilled gasoline, nor oil will affect the performance of the transducer.
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