Rebuilding Sherwood E35 raw pumps

[waybomb]

What couples a crank mounted pump to the dampener? What happens if the pump seizes?

[km1125]

There is an adapter that bolts right to the dampener.

I guess if the pump seizes you'd have a mess. I wondered the same thing. However, I've NEVER heard of a pump actually seizing. Bearings go bad but they get sloppy rather than seize.

There's actually a small bracket that holds the pump from rotating, but from what I've read it's hardly necessary when you have the reinforced hoses in place. I wondered if the stiff hoses (full of water) also could sideload the pump and cause issues, but I guess installs deal with that.

[km1125]

Well, I finally broke down and bought a couple major rebuild kits for m E35s. I was seeing a little steam from my port engine. I just replaced the impellers last year, so I thought they'd be good. I have noticed though that each year my engines seem louder even at idle.

I measured the old cam vs the new cam. The old ones (which have about 1200 moderate-use hours) were about 0.19" at the thickest part. The new one was about 0.24". The new one was a lot longer than the old one... I don't know if that is from wear, or from a slightly different design.
Here is what they both look like:

CAM_Pic_215614.jpg

I did not do the whole seal and bearing kit. I'll do that over the winter. I'm curious what difference this will make. I should know tomorrow.

[MakinTime]

I am just seeing this post now KM how many hours are on pumps? Did it make a difference in steam?

[km1125]

Qr Bbpost I am just seeing this post now KM how many hours are on pumps? Did it make a difference in steam?

My engines have about 1200 hrs, but pretty light to moderate duty. I don't often cruise over 20 mph, although the boat will do 28.

I did not do the whole pump rebuild yet. I have not really noticed much steam except when it's cool outside and then it's hard to tell if it's normal or not. Haven't had a problem with heat either but I always wondered how long the cams would really last and how much they would be worn. Now I know. I'm probably going to do the complete rebuilds on both pumps before launch this year. If I bring them home to do it, I might try to rig up a "before" and "after" flow test too.

[MakinTime]

The flow test would definitely be interesting. There is a little steam coming out of both my engines pretty evenally not much though, and never had a problem with over heating. Where did you buy your rebuild kits from?

[mjk1040]

Has any one measured the housing of a new raw water pump or have the spec's on new one? How much does the housing wear over time? Thought I saw complete rebuilds on eBay for half the price of a new one with core return.

[km1125]

There are specs on the Sherwood site. I'd have to dig around to find them, but they are there. I would not think the housing itself wears much, but the backplate can get scored. I guess the front of the housing could too. The biggest wear is in the cam though, and that's replaceable. I did not know how much wear until I bought my rebuild kit and compared those new cams with my old ones. (pics and details in an earlier post)

[mjk1040]

R u sure its all wear on ur old cam and not somewhat of a different new and improved designed cam? Just spit balling cause I have never seen an OEM new cam in a new pump!