Service And Maintenance - As Required - Northern Lights M50C13 Operator's Manual

Remove and Install Sea Water Pump
(M50C13, M65C13, M99C13)
NOTE: Sea water pump may have two more mounting
cap screws than illustrated. Remove/install procedure is
unchanged.
• Remove Sea Water Pump:
1. Close sea cock and drain sea water system.
2. Remove water inlet tube (shown removed) and outlet
tube (A) from sea water pump.
3. Remove two cap screws (B) attaching sea water pump
to gear housing. Withdraw pump from housing until
splined shaft (C) is free from splined drive gear ID (D).
4. Clean all gasket material from both mating surfaces.
• Install Sea Water Pump:
1. Position a new gasket on water pump mounting flange.
Install splined pump shaft in splined ID of drive gear.
2. Align mounting holes in water pump flange and gasket
with threaded holes in gear housing. Install cap screws
with washers and tighten cap screws to 47 N•m
(35 lb-ft).
3. Connect water piping and tighten clamps.
4. Open sea cock, start engine, and check for leaks.

Service and Maintenance - As Required

OM-C3 11/21
Remove sea water pump.
Outlet tube (A), Mounting screws (B)
Install sea water pump.
Splined shaft (C), Drive Gear Splined ID (D)
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