How to disassemble motor of Jabsco washdown pump?

[svlamorocha]

Hello everyone
We are sailing far from "civilization" and the motor (part 18919-0187) of the washdown pump (part 32605-0092) stopped working. I know the problem is in the motor itself and it is not the thermal breaker.

Unfortunately Jabsco's help is limited to telling me to change the motor, even though no one in Brazil seems to carry kit.

I did remove the two longitudinal bolts that link the cylinder-shaped housing a d the two end caps. That lets the caps rotate against each other and the moto housing, but I am still unable to separate the caps from the housing..

Does anyone know how to disassemble this motor?

Thanks in advance
Charlie

[skipmac]

Hard to tell from the photos, but one end or the other of the motor housing will come off. Probably the end you are showing.

So, remove the end of the motor housing and slide the rotor and shaft assembly out of the motor. BUT!!! When you do that the brushes are going to fall out. You will have to avoid dropping them into the bilge plus they are spring loaded and if you don't know the trick are a huge pain to get back in.

Also, unless you just have stuck or worn brushes there's not a lot you can DIY repair in a motor. The common failure modes are bad brushes (which you can fix), open or shorted winding (that you cannot fix) and cracked magnets (which you cannot fix).

If the motor is dead anyway I guess you don't have much to lose by taking it apart but it may not get you anywhere. Might end up cheaper just buying a new motor from Jabsco. Maybe a local alternator/starter repair shop could rewind the motor if that's the problem but it could cost more than a new motor.

[DeepFrz]

You may have to overcome the force of the magnetism to get the rotor out of the housing. Getting it back together may be a royal PITA, as stated by skipmac.

[skipmac]

Originally Posted by DeepFrz

You may have to overcome the force of the magnetism to get the rotor out of the housing. Getting it back together may be a royal PITA, as stated by skipmac.

Good point. With the magnets in the case the rotor is not going to "slide" out. More like a lurch or a snatch.

[bstreep]

This is a typical Jabsco pump motor. I had our alternator/starter guy look at one of ours, and he said "it's not worth rebuilding, the insides are all corroded". It looked fine on the outside.

[GordMay]

... Maybe a local alternator/starter repair shop could rewind the motor if that's the problem but it could cost more than a new motor.

Indeed.
In this case, a replacement motor doesn’t appear to be an option (“no one carries it”); so it's either an expensive motor repair, or a complete pump/motor replacement (if available).

[svlamorocha]

Originally Posted by GordMay

Indeed.
In this case, a replacement motor doesn’t appear to be an option (“no one carries it”); so it's either an expensive motor repair, or a complete pump/motor replacement (if available).

Thanks Gord. This it how it ended up.

This pump came with a boat that is four months old and had only only been used twice before the motor died.

We could not separate the two end caps of the motor from the cylinder-shaped casing. We could rotate them, but not separate them. There is more than magnetism involved; there are two metal parts that seem to be pressed in to prevent you from opening the motor.

I went to all the chandleries in Salvador and looked at 13 different models of Jabsco pumps to see if I could buy one just to use the motor. It turns out that none of them had the same motor. Lesson learned is that nowadays you cannot rely on "canibalizing" your spare fresh water pump to replace the motor of the washdown pump or the watermaker fresh water flush pump or the shower sump pump, etc..

They are all different now! This is good learning for me and it is relatively "cheap" learning because a washdown pump is not that important really...

Charlie