Coolant Circulation; Heat Exchanger - Seakeeper 7000 Service Bulletin

Procedure: ANNUAL INSPECTION INSTRUCTIONS
SERVICE
BULLETIN
3. Annual Inspection Instructions
3.1 Model 7000 / 7000A :
3.1.1 Cooling System -

Confirm gyro's 24 VDC breaker in ON and listen / feel coolant circulation pump to confirm it is
running and operating properly. Pump is located on the port side of the aft transverse brace of the
gyro frame as shown in below photo. If you hear intermittent noises (pump cavitation) , this may
indicate air in the coolant plumbing and the system should be filled / purged per instructions
provided in installation manual ( manual is available for download at
http://www.seakeeper.com/downloads_manuals.php)

COOLANT CIRCULATION

PUMP

Inspect heat exchanger and fittings for any leaks or severe corrosion. The heat exchanger is
located below the aft transverse brace of the gyro frame as shown in above photo. Insure seawater
cooling hoses are isolated from incoming seawater (i.e: close sea-cock) and disconnect seawater
inlet and outlet hoses and flush heat exchanger with fresh water to insure there are no internal
blockages. Once flushing is complete , make certain to secure seawater inlet / outlet hoses to the
heat exchanger with appropriate hose clamps and open the appropriate sea-cock for the water
intake.

HEAT EXCHANGER

Model 7000 / 7000 A COOLING COMPONENTS
Document #: Rev:
90133 1
Page:
2 of 16