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Forum: Engines and Propulsion Systems

20-01-2018, 18:51

Replies: 70

Burned up new raw water impeller

Views: 14,665

Posted By kmacdonald

Re: Burned up new raw water impeller

Raw water strainer maintenance: Rebuilding A Perko Bronze Sea Strainer Photo Gallery by Compass Marine How To at pbase.com (https://www.pbase.com/mainecruising/rebuilding_a_sea_strainer&page=1)

If...

Forum: Engines and Propulsion Systems

20-01-2018, 18:16

Replies: 70

Burned up new raw water impeller

Views: 14,665

Posted By kmacdonald

Re: Burned up new raw water impeller

Yes they do and it is a common source of leaks. They need to be resealed from time to time. For safety and convenience they are often placed above the water line. That way they can be cleaned...

Forum: Engines and Propulsion Systems

20-01-2018, 18:00

Replies: 70

Burned up new raw water impeller

Views: 14,665

Posted By kmacdonald

Re: Burned up new raw water impeller

To "PRIME THE PUMP" the pump needs to suck water from the seacock to the raw water pump. That's it.

Forum: Engines and Propulsion Systems

20-01-2018, 17:50

Replies: 70

Burned up new raw water impeller

Views: 14,665

Posted By kmacdonald

Re: Burned up new raw water impeller

IF YOU NEED TO DO ANYTHING TO PRIME THE RAW WATER INTAKE, EXCEPT START THE ENGINE, THERE IS A PROBLEM WITH YOUR COOLING SYSTEM. COMPENSATE FOR THOSE PROBLEMS AT YOUR ENGINES OWN RISK.

Forum: Engines and Propulsion Systems

20-01-2018, 17:21

Replies: 70

Burned up new raw water impeller

Views: 14,665

Posted By kmacdonald

Re: Burned up new raw water impeller

If there is a siphon break on the intake side of the raw water pump it will never prime. Siphon breaks are between the exhaust manifold and water injection elbow.

Forum: Engines and Propulsion Systems

20-01-2018, 17:19

Replies: 70

Burned up new raw water impeller

Views: 14,665

Posted By kmacdonald

Re: Burned up new raw water impeller

With a worn pump there won't be 3 feet of water in the siphon break, it would have drained out. With 3 feet of water in the uphill and downhill side of the siphon break there will be zero head. ...

Forum: Engines and Propulsion Systems

20-01-2018, 17:02

Replies: 70

Burned up new raw water impeller

Views: 14,665

Posted By kmacdonald

Re: Burned up new raw water impeller

The pump would have to be extraordinarily worn not to prime. There would be no head caused by an empty siphon break or full siphon break. The bottom line is that if your water intake system won't...

Forum: Engines and Propulsion Systems

20-01-2018, 16:10

Replies: 70

Burned up new raw water impeller

Views: 14,665

Posted By kmacdonald

Re: Burned up new raw water impeller

If your pump wont self prime you have air leaks or collapsed hose, eternal or internal. The intake hose from seacock to pump should be wire reinforced to prevent collapsing.

Forum: Engines and Propulsion Systems

19-01-2018, 12:17

Replies: 70

Burned up new raw water impeller

Views: 14,665

Posted By kmacdonald

Re: Burned up new raw water impeller

Rubber impeller pumps are self priming. There is no need to fill strainers or anything else for that matter. Just open the sea cock and start the motor. Fin position doesn't matter either, it will...

Forum: Engines and Propulsion Systems

19-01-2018, 06:16

Replies: 70

Burned up new raw water impeller

Views: 14,665

Posted By kmacdonald

Re: Burned up new raw water impeller

Sounds like the inlet and outlet hoses were crossed or hooked up backwards. Sucked air from the exhaust outlet.

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