SE 106 outdrive impeller failure - Can this cause overheating?

[bigmikek]

No only one piece of the impeller fin was found. It was found below in the area where the port and starboard inserts are held in place by one SS screw. That leaves several other pieces at least that size someplace. I was hoping they might have went out the exhaust with water. ( Is it possible thay left the engine? )
I am going to follow these directions. http://www.boatfix.com/merc/Servmanl/6/6B3R3.PDF see pages 52 and forward of the 56 pages. I have two similar pieces of rubber coming .... one called a slinger and another called a seal. From the images of parts for 96-102-04 Seal
96-102-06 Slinger
They look the same except one is much taller. I don't find the taller one on this outdrive or the PDF instructions. The housing looks pretty good. Luckilly.

 

[bigmikek]

I got the right impeller kit parts and reassembled the lower unit - Works great! Had it out on the river today and it runs at around 120-130 in higher speed and idling in gear at 165 - 170 tops. I was hoping for 150 - 160 idling temp but maybe that's good. There's a whole other thread on some trouble I had in reassembly. Check my profile for a topic SE106 lower unit Alpha 1 Series 1 - can't shift into reverse after impeller fix

 

[bigmikek]

My temp rose again to 200 on Sunday. I can only figure that the impeller has already failed or I need to replace my thermostat.
I was pretty confident that the impeller job was done correctly.
ANY IDEAS?
I should replace the thermostat anyway. That is next. ( Glad I bought two impellers )

 

[bigmikek]

duplicate post

 

[redneck joe]

run without a thermostat and see if that 'fixes', then buy a new one. You really need one i there but for testing try it.

 

[bigmikek]

Great idea. Thanks!

 

[bigmikek]

I took out the thermostat this evening. Quite a bit of orange stain in there and draining the block showed a lot of orange-ish water. I am going to go out and give it a try tomorrow on the river without a thermostat. I did not boil water with the thermostat in it or light a match to the thermostat to see if it opens up. I don't think that is a reliable test to see if it is still good.
If this is still overheating I think I'll be sick. The summer is halfway over and I was so sure I was going to be out a lot more than I have been able to.

 

[redneck joe]

question - when you tested 'good' how long did you run it when it maintained a good temp? Is it a slow temp rise or fast?

Our last boat had a temp problem after I changed impellers - it was fine at idle then medium fast rise when out at hull speed but I could put in neutral, rev several times and it would drop back. Long story short I had the impeller in backwards. It was a v-drive so different impeller location (on block not sterndrive) but EVERYONE told me if I did have backwards it would flip itself over; it did not. When I pulled off and installed correctly it was fine.

Sort of.

Always had a slow rise overheat unless water temps were in the 50's or lower but never got around to pulling the risers, which were most likely the cause. Have that on current boat as well and at 25 years old probably the same I'm just going to live with it until this winter

 

[bigmikek]

question - when you tested 'good' how long did you run it when it maintained a good temp? Is it a slow temp rise or fast

I had the impeller in correctly, triple checked and watched Chris's video on YouTube who is also a forum member here with my highest respect.

First time I took it out on the water it seemed to be fixed. Rode up river a mile at maybe 25-30 mph and it remained at maybe 125 degrees. Anchored, jumped in the river for a personal cool off. Started it up and it idled and rose to about 160- 170 degrees. Put it in forward and idled around awhile and it stayed OK. Took it back to the dock and the temp dropped on the way back.

Last time out I went about 3 miles up river. Temp was great at about 125 degrees until I had to dock at a friends river lot. I had to idle for about 4 or 5 minutes waiting on kids to move and a boat to come out and I looked at the gauge and it was at around 190 -200 and the engine sounded hungry for water. That's the best I can explain that.

I shut it down anchored and went to the picnic. When I came back out after the picnic, to run back to the launch, it ran cool but when I docked to trailer it went up to about 175-180 pretty quickly in idle.

I am getting out there today and see what it's like without a thermostat. What concerns me some is the amount of orange rust inside the block and water jacket and on the thermostat and in hoses. I bet this needs a good flushing. It's not like there's "clinkers" and "stalactites" of rust inside but it strikes me as not normal.
Like water lay in there and perhaps this happens to any engine?

 

[bigmikek]

Redneck Joe,
I had it out in the water today, just got back. Without the thermostat in it acted the same.
Rose up to 200 degrees and would have gone higher. I am going to have to take this boat to a professional.
I am going to YouTube a video on flushing the water system and try that as my last resort and probably check the impeller again but something seems to be restricting water circulation. It is possible a couple pieces of the old broke impeller are causing a blockage.
I am so disgusted.
I do appreciate the thoughts and comments people have taken the time post and have tried to help me out here.

 

[bigmikek]

FIXED FIXED FIXED !!!
The problem was the copper tube pushed the rubber sleeve that is in the upper unit over to restrict about half the flow of water I was supposed to be getting. I watched a YouTube video and instead of sticking the copper tube up in the upper unit, I set it in the lower unit and in joining both pieces, it pushed the rubber out of shape and sort of folded it over.
The proper way is to USE the plastic guide pc. in the lower unit to guide the hanging copper tube into the lower unit rubber seal.

All great right ?!?!?
Nope .... my bellows is torn. Upon starting and running on muffs a 1 and 1 /2 inch tear is found on the port side of the bellows. Next the whole outdrive comes off.