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Old 01-08-2020, 09:22 PM   #1
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Seawater pump replacement: NL 12kW genset

Have leaking seals so I plan to perform my first seawater pump change.
Any words of wisdom from those that have done it on this unit?
Any unique tools needed for this?

Have a new pump and the exploded parts diagram from NL.

Thanks in advance.
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Old 01-09-2020, 08:47 AM   #2
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I changed ours 9 months ago. We were at anchor and I don’t remember any drama, so it must have been easy. If access is reasonable metric wrenches/sockets and whatever hose removal tools you have are all that’s needed. If I remember correctly there is an inboard oil fill housing which fits to the pump bolts. Some oil may leak when the bolts are loosened and take care not to damage the housing seal. Hope it goes well.
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Old 01-09-2020, 10:17 AM   #3
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You will probably have to move the drive gear from the old pump to the new pump, and some sort of pulley is likely required. I havenít changed one my self, but understand this to be the case. ski probably knows first hand.
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Old 01-09-2020, 10:40 AM   #4
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I used the gear from the old pump which is taper fit, secured with a nut. Did not have a gear puller so used a couple of small wood wedges, tapping with a hammer to force it off.
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Old 01-09-2020, 01:17 PM   #5
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Ha what timing. I have an 8KW Onan and I am waiting on the pump to arrive. Must be made of gold for the price I paid. My leak is dropping water right on top of my fuel pump. It would appear I will have to disassemble the STD side of the motor (sensors, fuel shutoff solenoid ect) to get access to the pump.

Good luck
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