Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 14-07-2018, 09:17   #31
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 23,238
Re: Electric genset raw water alternative to march

Quote:
Originally Posted by kenbo View Post
Hey 64pilot, I always wanted to ask you about your genset water pump">raw water pump. I think it's a great idea but there is a failure mode that worries me. What happens if the generator end fails, there's no AC to power the pump but the engine is still running. Is there a system to shut down the engine before it overheats?


Iím sure truth be known that it wasnít my idea, Iím certain I heard it here, but donít know from who.
However the failure mode of an electric pump failing is the same as a mechanical one, that is the gen will overheat and shutdown from the Murphy switch. Seeing as how the mechanical one fails often and I replaced it with an electric one, I think the likelihood of a failure is less.
I replaced mine cause the mechanical one developed a leak and began spraying salt water all over inside of the enclosure without me knowing, and the generator is an air cooled thing and of course was ingesting salt water. Only way I found out was the pump eventually seized, throwing off the belt and the gen overheated and shut down.
Exhaust system seemed unharmed.

I didnít want that to ever happen again, so what I was really doing was removing the pump from inside of the enclosure to prevent any further salt water baths.
There are of course overheat and no water flow alarms, some are not all that expensive if you think it necessary.
However I never run the generator without being on board, and as I run it to power ďthingsĒ power goes off and even if I donít notice the exhaust suddenly getting louder, Iíll probably notice the ďthingsĒ are no longer working and check to see what is going on.
__________________

a64pilot is online now   Reply With Quote
Old 14-07-2018, 10:24   #32
Registered User
 
svHyLyte's Avatar

Join Date: Mar 2006
Location: Tampa Bay area, USA
Boat: Beneteau First 42
Posts: 3,807
Images: 25
Re: Electric genset raw water alternative to march

Quote:
Originally Posted by Sailmonkey View Post
The brown plastic is not a shroud, the motor is encapsulated and water cooled. No motor maintenance is possible. However the pump is submersible.
Ah hah... Learn something new every day. My assumption was based upon a friend's boat who has a plastic cover over his drive motor and I assumed A-64's was the same. Assumption is the root of error too often, eh?
__________________

__________________
"It is not so much for its beauty that the Sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."
svHyLyte is offline   Reply With Quote
Old 16-07-2018, 05:26   #33
Registered User
 
svHyLyte's Avatar

Join Date: Mar 2006
Location: Tampa Bay area, USA
Boat: Beneteau First 42
Posts: 3,807
Images: 25
Re: Electric genset raw water alternative to march

Quote:
Originally Posted by svHyLyte View Post
Ah hah... Learn something new every day. My assumption was based upon a friend's boat who has a plastic cover over his drive motor and I assumed A-64's was the same. Assumption is the root of error too often, eh?
Further to the foregoing, yesterday I ran into our slip neighbor with the plastic cover and mentioned this discussion. He explained that the shroud over his March pump is actually a cover for a Jabsco electric head conversion kit. It seems that at some point he had to purchase a replacement conversion kit and so ended up with two covers. Accordingly, he cleaned and painted one "teak brown" (kind'a) and secured it over his March pump which is installed under his galley sink counter to protect the pump drive motor from water drips. When showing him how to lubricate his drive motor, I simply "assumed" (that dreaded word again) that the shroud he removed for access was part of the original equipment for the pump which it was not. So, still learning something new every day.

FWIW...
__________________
"It is not so much for its beauty that the Sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."
svHyLyte is offline   Reply With Quote
Old 16-07-2018, 09:46   #34
Registered User
 
CaptTom's Avatar

Join Date: Apr 2004
Location: Southern Maine
Boat: Prairie 36 Coastal Cruiser
Posts: 1,456
Re: Electric genset raw water alternative to march

That green pump in the first post looks identical to one I picked up on eBay, intending to save money over a March air conditioner pump. The thing rusted pretty badly. The March pumps are mostly non-metallic, magnetic drive, and are made to live in bilges.

I assume any brand pump made for use in marine air conditioning would work, it doesn't have to be March. What do they usually use down there?
CaptTom is offline   Reply With Quote
Old 16-07-2018, 10:55   #35
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 23,238
Electric genset raw water alternative to march

There are of course several March pumps, of different designs.
Itís sort of Akin to saying Chevrolet Automobile, that covers a pretty wide variety.

I only used a March pump to maintain commonality with my air conditioners, so that way I carry one spare that can be used every applications as opposed to having to buy and carry multiples.
Iím certain that any continuous duty cycle electric pump would work if itís the right flow rate.
a64pilot is online now   Reply With Quote
Old 16-07-2018, 11:17   #36
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 23,238
Electric genset raw water alternative to march

My forward AC pump is this guy, it came with the AC as part of the kit.
I didnít think it would last long but installed it anyway as it came in the kit.
Three years later and itís still going strong. I think it would also work on a small generator. When it goes Iíll put the March in.
Click image for larger version

Name:	IMG_1198.jpg
Views:	23
Size:	56.2 KB
ID:	173672

Available here and other places for about $90. https://www.bulkreefsupply.com/pan-w...hoCnsQQAvD_BwE
I have seen itís 12V brother on EBay for $65 or so
a64pilot is online now   Reply With Quote
Old 16-07-2018, 12:27   #37
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 23,238
Re: Electric genset raw water alternative to march

You know, when I start looking at 500 GPH aquarium pump, I come up with a lot of March looking pumps, at less than 1/3 the cost, anybody know why a salt water submersible aquarium pump wonít work? They are continuous duty, running 24/7.
https://www.saltwateraquarium.com/ma...hoCl14QAvD_BwE
a64pilot is online now   Reply With Quote
Old 19-07-2018, 12:37   #38
Registered User
 
svHyLyte's Avatar

Join Date: Mar 2006
Location: Tampa Bay area, USA
Boat: Beneteau First 42
Posts: 3,807
Images: 25
Re: Electric genset raw water alternative to march

Quote:
Originally Posted by a64pilot View Post
You know, when I start looking at 500 GPH aquarium pump, I come up with a lot of March looking pumps, at less than 1/3 the cost, anybody know why a salt water submersible aquarium pump wonít work? They are continuous duty, running 24/7.
https://www.saltwateraquarium.com/ma...hoCl14QAvD_BwE

Submersible pump motors are sealed and so rely upon submersion for cooling. Absent that, the bearings tend to burn up fairly quickly.
__________________
"It is not so much for its beauty that the Sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."
svHyLyte is offline   Reply With Quote
Old 19-07-2018, 13:23   #39
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 23,238
Electric genset raw water alternative to march

I took it that they could be submersed, but itís not required.
The most commonly used March pump, the one that has the motor encased in some form of reddish plastic is submersible, but I think rarely is.
I get your point though, ensure pump is allowed but is not required to be submerged for cooling.
Only ones I am aware of that require submersion have no inlet hose fitting, they are like bilge pumps, have the screen as part of the pump body.
I priced a March myself, and they are very spendy, I had forgotten how much so Iím interested in an alternative, and maybe a non Marine item could be the ticket, like a BIG salt water aquarium pump, they are designed and intended to run 24/7 for a long time, years.
a64pilot is online now   Reply With Quote
Old 19-07-2018, 13:27   #40
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 23,238
Electric genset raw water alternative to march

One I linked to says operates submerged or inline in its product description.
a64pilot is online now   Reply With Quote
Old 19-07-2018, 15:50   #41
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 6,794
Re: Electric genset raw water alternative to march

Quote:
Originally Posted by a64pilot View Post
One I linked to says operates submerged or inline in its product description.


Iíve been using an Iwaki pump on the AC for 5 years. Ow without a problem.

https://www.iwakiamerica.com/products/wmd.htm
__________________

Sailmonkey is offline   Reply With Quote
Reply

Tags
arc, electric, raw water, water

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
ONAN Genset Raw Water Impeller Failure impi Engines and Propulsion Systems 60 08-08-2018 18:38
Electric Centrifugal Raw Water Pump 12V Sagittaire Engines and Propulsion Systems 20 22-06-2011 23:13
Electric Raw Water Pump? Simes Engines and Propulsion Systems 4 13-04-2010 05:18
Raw Water Intake Hoses from Genset and Engine Question Panamajames Construction, Maintenance & Refit 21 08-10-2009 10:34



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 12:38.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.