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Watermaker 2018

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marcopone View Drop Down
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Joined: 24 April 2013
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Post Options Post Options   Thanks (0) Thanks(0)   Quote marcopone Quote  Post ReplyReply Direct Link To This Post Posted: 24 August 2018 at 10:38
Thanks Rick.
With the smaller unit, 6kw, it is not so bad to change the impeller.
I had to do it already twice.
Besides having had a major issue the first year, they had to change the whole unit, now I suffer from salt water leakage from the cooling pump. the seal is broken. this bappened also 2 years ago.
there is a lot of salt around the pump.
do you have a whole pump as a spare?
I am not sure you can change the salt water pump without taking out the generator!
In your boat you have the boiler above the Volvo Penta motor or outside above floor?
I think to fit the bigger generator the had to move the boiler from motor hall.
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Black Diamond View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Black Diamond Quote  Post ReplyReply Direct Link To This Post Posted: 24 August 2018 at 11:15
The Johnson pump is a spare, but nothing I expect to use anytime soon.  Just a precaution.   Its reasonably accessible on the 8KW.   Having had the same 8KW on my last boat,  the only thing not in the normal maintenance schedule I'd recommend is cleaning out any buildup in the heat exchanger.   This is with RIDDEX or some kind of CLR product.     Load it thru the strainer,  let it sit in the exchanger for a few minutes and then run it out.    Its the difference between a tiny stream of water coming from the generator and a good cooling stream.    That said,  it was a good generator for us and did not cause any unexpected work.

Our hot water boiler is below the floor on the starboard side by the nav station.   

Remember, the definition of cruising is "Fixing things in exotic places". 


Rick
S/V Black Diamond
Hanse 575 #161
Newport, RI
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Wayne's World View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wayne's World Quote  Post ReplyReply Direct Link To This Post Posted: 24 August 2018 at 13:58
Marcopone, 

The raw water pump on the 8kw can be removed with the generator in place. There is a bolt which clamps the pump in place which needs to be removed and then the pump can be pulled aft out of the motor casing. The Johnson pumps can be rebuild and the seals replaced. But I keep a spare complete pump so I can change it out if the one in service leaks. I my opinion this Johnson pump is prone to leaking. I have had the pump serviced or replaced 4 times in just over 1,000 hours of running which is very poor.

Wayne W
Cruising, currently in the Mediterranean.
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marcopone View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote marcopone Quote  Post ReplyReply Direct Link To This Post Posted: 24 August 2018 at 14:12
Good Wayne, thanks.
I hope the same applies to the smaller 6kw unit.
We are speaking of the small bronze pump in the back of the gen, port side, correct ?
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Wayne's World View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wayne's World Quote  Post ReplyReply Direct Link To This Post Posted: 24 August 2018 at 19:57
Marcopone,

Correct. If you look closely at the area where the pump is fitted into the motor housing you will see a small (7mm or 8mm I think) bolt which you need to remove. This clamps the pump in place. Remove the two sea water pipes from the pump. Then once this bolt is removed you need to pull the pump aft to take it out of the motor casing. You may need to use a large screw driver to help lever the pump aft. Rotating the pump back and forth may also help. There are other larger bolts near where the pump fits into the motor casing but you do not need to loosen these. Once you know how to remove the pump it only takes 15 minutes to remove one pump and replace it with a new or serviced pump. 
Wayne W
Cruising, currently in the Mediterranean.
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Black Diamond View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Black Diamond Quote  Post ReplyReply Direct Link To This Post Posted: 09 September 2018 at 13:40
I do the same with my outboard motor.   I keep an entire carb as a spare so I can swap it out. Here in the US its tough to buy gasoline without ETHANOL in the fuel (up to 10 or 15%).    The ethanol gums up everything in the carb and I like to spend a proper amount of time cleaning the one I took off the engine.

Over time, the ETHANOL in your tank or in the marina's fuel tanks turns into a parfait of sorts with water, ethanol and gasoline in layers.   If you are unlucky enough to get bad fuel from the marina, or yours went bad, the carb will need to be cleaned after it gums up.

FWIW - I keep spares for everything...   Only the really expensive engine spares I think hard about..  Water pumps, gen parts, outboard parts, etc.. I usually have 2-3 spares.


Rick
S/V Black Diamond
Hanse 575 #161
Newport, RI
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