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Sherwood e35 rebuild - how often?

B

bobct

Advanced Contributor
How often do you guys rebuild yours? The Sherwood doc I found says minor rebuild every two years. This one is brand new from 2013. I have had an intermittent screaching noise for a couple of months this season. I changed the impeller about a month ago, the old one was fine but it was due anyway. I was expecting this to be the noise. I'm sure there were beginning stages of what you see in the pic but i missed it.

I finally had someone on board with me so I could go down in the engine room and listen with a stethascope. Ok, verified that the noise was internal to the pump. Pulled it apart and look at the pic! The end plate bearing is completely gone, like it was machined out. The other end plate/cover in the pic is my spare. If you look closely, you can see a pile of the graphite powder on top of the impeller.

Definite play in the shaft now and not sure if that is the cause of the destruction or as a result, meaning shaft has been spinning around unsupported. I just assumed that these pumps would be good for many hundreds of hours before needing a rebuild. The one you see here has 200 hours tops so it's beyond the minor rebuild recommendation and right at the "major rebuild" stage. Unfortunately, I don't have room for the crank mounted version so I have to stick with the E35's.

What do you guys think?

Bob
 

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If the graphite bushing is worn, its likely the ball bearing (opposite end) is worn as well....the Sherwood manual will give you enough insight into how to disassemble it....I seem to remember a snap ring that was a bit of a pain....access to a press would help for removing the pulley flange - just measure it before you remove it if the manual is silent there. and get the bearings and the seals from a bearing house - the ones in the factory kit aren't any different other than being marked up a bunch.

I remember having to change bushings every when we were doing a lot of trolling (400-500 hours a year)....that was a big driver for going to the Jabsco replacements - get bearings on both ends of the shaft...unless you rack up a lot of hours, its probably more cost effective to add the bushings to the annual maintenance list.
 
Bob, one of the problems with this style seawater pump is the "side load" (caused from the belt tension) that is placed on the shaft at the pulley side.
A portion of this force is also applied to the opposite end of the shaft.
Unfortunately, at the opposite end of the shaft we have a bushing ONLY.

Perhaps loosen the belt tension some..... but make dang sure that the belt tension is enough to turn the impeller.


Ideally, you would install the Johnson F5B-9 or F6B-9 Crankshaft seawater pump.
With this style seawater pump, there is no side load placed on the shaft or any bearing.
Minus annual impeller removal (for winter lay-up) and spring time re-install, these pumps will literally go for years and years without any issues.


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Thanks guys, I'm going to rebuild the one I have for now. Over the winter, I'll investigate my front of engine access. I might even explore adding an access panel for each. Yes, "wow" describes it pretty well. It was machined out so perfectly nothing looked out of place. An extra two minutes of inspection would have gone a long way.
 
We used the JABSCO 42730-000 retrofit pumps.....bearings on both sides of the impeller and fits in the E-35 space.....and very easy to overhaul....but they are rather pricey nowadays, especially at MSRP!!
 
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