2013 5.7 overheating after impeller failure

[thorn210]

2013 x 14 with 50.4 hours and impeller fails. Ok mastercraft suggest changing impeller at 50 hours. Towed boat back and change impeller. Now the engine runs fine if you keep rpm below about 1800 RPM, 160 degrees. Anything over that temp goes up to 200 were alarm goes off and if slowed to less than 1800 rpm temp starts to drop. My question is the impeller broke into pieces, Are those pieces in the cooling system blocking water flow? My guess is yes. Anyone know were I should look? thermoset? surely its not in all the coolant passages? I did not inspect hose going in and out of pump when changing impeller. The boat is an hour from my house so it cant work on it right now. I don't want to take it to dealer if its something simple. Not sure it would be covered under warranty because the impeller is not... thanks for any help resolving this issue. I was pulling my son on wake board 21 mph when it failed. will post pick of impeller when camera finish charging.

[CantRepeat]

Is it an Ilmor or Indmar motor?

They can be stuck ANY where up stream from the raw water pump.

[Thrall]

Hard to believe a 50 hr 2 yr old impeller cut loose without running it dry for a while sometime prior, but.....
Impeller pieces could be lodged anywhere in the cooling passages but start with everything easy to remove downstream of the raw water pump. But it should be before the thermostat which would limit bigger pieces from passing through to the engine.
If it runs cool at lower rpms and heats up with higher rpms definately sounds like partial block of the flow.

[thorn210]

Its Ilmore. Before I pulled him we where at a rope swing. Keep having to start boat and move a bit to keep from drifting in wind. The more I think about it after read the sea strainer threads, maybe were it initially got damaged. Yes the boat sat on dealer lot till I purchased in April of this year, and put fifty hours so far.

[mikeg205]

yah... sorry to read this.. all pieces will have to be found..

Call the dealer. I think the 2013 models are known for sucking air and destroying the impeller, they have a service bulletin to relocate the sea strainer to stop it. All covered under warranty.

[Illinois Jay]

have you pulled the hoses off of the top and bottom of your transmission cooler and check the tubes for blockage. thats where mine usually end up.

[thorn210]

Found all but one piece of a vane. went out this weekend and it ran fine. Called Ilmore and they told me were to look to find pieces. Most were caught in spring that is in the hose that feeds the circulation pump. The others were in a small hose that has a check vavle in it. It was completely stopped up. On the Ilmore the trans cooler is before the raw water pump unlike both direct drives I had before. Thanks guys for all the suggestions.http://http://i1090.photobucket.com/...0/DSCF0417.jpg

[thorn210]

http://i1090.photobucket.com/albums/...0/DSCF0417.jpg

[Mastercraft13]

Yep, 2013 Sherwood had some less then quality impellers due to a changed EPA regulation on the manufacturing process. Basically the rubber to nylon ratio was incorrect and they fail very early. I replaced mine at 65 hours and I had numerous cracks already. From what I was told they have corrected the issue. More of a nylon then rubber mixture. The one I put in at the beginning if the year felt a lot better and has held up to this day.