Carver Owners Forum

Its time to replace my sea water pump impellers, they are 4 years old. Ugh! I have seen an upgrade replacement pump from Seaboard SMX 1730. They suggest on their add the stock pump is inferior and prone to failure. They are $750 compared to the stock pump of $430. Has anyone had to replace a failed pump on their Cummins 370 6BTA. My 2001 engines have 570 hour on them and about 100 hours on impellars. Thinking about putting spare pump onboard as well as impellar. Thanks

Are these in fresh or salt water? Your call, but I would wait until after I changed the impellers and did a visual on the pumps. If you show signs of possible failure or excessive internal wear, I would then contemplate my next move, replace with originals or upgrade them? Your $$, your call! Mike

I would definitely agree. Rather rare for a pump to wear out unless the water you are in is very dirty and you have thousands of hours on the clock. 4 years and no issues, doing preventative maintenance sounds quite good and no indication of wear IMHO.

The Sherwood pumps are junk. I replaced mine with the ones from Seaboard and had zero issues with them.

Keep in mind its not the impeller that fails but rater the seal on the shaft that drives the pump.
When it fails it will take out the gears in the front of the engine.
This is what is considered complete engine failure.

Mystic144 wrote:Source of the post....the seal on the shaft that drives the pump.
When it fails it will take out the gears in the front of the engine.
This is what is considered complete engine failure.

+1
Replaced a Cummins 2 years ago for this very reason.

My Cummins 330's have the stock Sherwood pumps. The boat is a 2002 Carver 406. After 15 years and 800 hours (550+ in salt water) both are doing just fine with no leaks, drips, or weeps. All I have ever done is change the impeller every 100-150 hours.
I keep hearing that the Sherwood pumps are junk, but that's not true for me.

What is normal life expectancy for impellers when used in saltwater?

ScubaPete wrote:Source of the post My Cummins 330's have the stock Sherwood pumps. The boat is a 2002 Carver 406. After 15 years and 800 hours (550+ in salt water) both are doing just fine with no leaks, drips, or weeps. All I have ever done is change the impeller every 100-150 hours.
I keep hearing that the Sherwood pumps are junk, but that's not true for me.

Agreed. I have the same engines with stock raw water pumps. The impellers are changed almost religiously at 100 hours and the 20 year old pumps are going strong. This boat has been in salt water its entire life.

How difficult is it to change out the port impeller? Cummins 330hp 5.9