View Full Version : What an impeller should and should not look like.

07-09-2012, 11:11 AM
We were out in our '94 ProStar 190, things went great in the morning, but in the afternoon the temp gauge just took off and the engine temp light went on. We got the boat back to the dock and then opened up the cover and pulled the impeller (or what was left of it). See the picture here in comparing the old vs a new impeller - decided that we will replace this at least every other year to play it safe. Put the new one in and everything is back to normal!

07-09-2012, 11:55 AM
How long did you have that thing in there?? This should be replaced every spring, and keep the old one for backup. It's very cheap insurance.

07-09-2012, 11:56 AM
We just bought the boat a few weeks ago, my guess is a good 6-8 years.

07-09-2012, 11:57 AM
I pull mine after every season, then replace the following season, usually put a new one in every 2-2.5 years.

07-09-2012, 12:16 PM
Yes - we had 2 spares, both on shore - I think I will keep 1 on shore and then 1 in the boat with a few tools on board just in case. And I think we are going to replace every 2 years and possibly every year. We'll always inspect it every spring now. Glad it was not costly and glad we had a couple of spares already.

07-09-2012, 01:00 PM
find all the vanes off the old one. they are somewhere in the cooling system.

07-10-2012, 08:55 PM
Replace it every spring....you wont loose a day on the water because of it. Keep the old one as a spare.

07-10-2012, 10:34 PM
That new impeller don't look so new. It already has bent vanes.

07-11-2012, 01:05 AM
find all the vanes off the old one. they are somewhere in the cooling system.

Yes, I agree... Those vains are somewhere in the system. If your lucky alot have flushed out but I doubt it.

Miss Rita
07-12-2012, 11:10 AM
If the broken vanes are in the block, how do you get them out? Is there any way to backflush the block?

07-12-2012, 11:22 AM
Yeah, Id like to know that too.

07-12-2012, 11:26 AM
They are in the trans cooler. See Pics.

07-12-2012, 11:38 AM
So just removing the hoses and I should see what is left. I imagine smaller pieces have flushed their way through the system and out the exhaust (that is what I am hoping) and then I can remove anything else that is left. Thanks for the info!

07-12-2012, 12:17 PM
There is a screen in the trans cooler to keep debris from going through the system. I you don't clean it out, it will overheat again.

07-12-2012, 01:04 PM
IIRC, the trans cooler is in front of the pump (lake side versus motor side) on that model and would not catch the broken blades. Would check thermostat housing and use a rod to clean out the exhaust risers at the connections coming off the thermostat housing. Also, see if you have hot spots (like one riser hotter than the other) while running to isolate clogs. Given that level of neglect, you should probably replace the t-stat too.

07-12-2012, 01:49 PM
Thanks For The Pics! Hope You Got It Fixed!

07-15-2012, 09:44 PM
Thanks everyone! Heading back up to the cottage this weekend to finish the job, appreciate the tips.