[C320-list] Johnson Water pump replacement for Yanmar

[Joe Luciano]

One thing I try to do which I believe extends the life of raw water pump bearings and seals is flush the raw water pump with fresh water any time the boat is likely to sit for more than a week.  I have a connection between the thru hull valve and the strainer that I can hook up a clear hose to and let the engine pull from a 5 gallon bucket of fresh water.  I’ve only had to replace pump seals once in 15 years.  And the one time was early on before I installed the fresh water flush…..

Joe Luciano 
#1044

Sent from my iPhone

> On Apr 26, 2022, at 7:09 PM, Jeff Smith <svsailmates512 at gmail.com> wrote:
> 
> I just to rebuild my pump (Perkins not Yanmar). Given that your bearings
> failed, just realize that is a more difficult task than simply replacing
> the o-ring seals. I used a ball joint press kit from an auto parts store to
> press the bearings, but it was far from a smooth operation. My thought
> process was that, for $35 - $45, it was worth an attempt before I committed
> to $250+ for a refurbished pump.
> 
> YMMV,
> Jeff
> ‘94, #121
> 
>> On Mon, Apr 25, 2022 at 3:50 AM Dennis Cookson <dennis at cooksons.net> wrote:
>> 
>> Dean, I had a similar situation and chose to refurbish the pump.
>> Replacement bearings and o-rings are of standard size and readily
>> available. Any marine engineer could fit these for you.
>> 
>> Dennis Cookson
>> Catalina 577
>> 
>>>> On 25 Apr 2022, at 04:10, Dean Agee <dagee at iserv.net> wrote:
>>> 
>>> My Johnson F4B-903 pump froze up.  I disassembled it and found the
>> smaller bearing had failed.
>>> 
>>> It appears there are number of replacement options.  Does anyone have a
>> recommendation for a pump?  For a vendor?
>>> 
>>> Thanks!
>>> 
>>> 
>>> Dean Agee
>>> AhSeaHola, #912
>>> 
>>> Bay St Louis, MS
>> 
>>