Please help my opti

[warhorse]

So i have had this never ending overheat struggle with my 150 opti.
I replaced my impeller (full kit) before Rainy river this april. Still overheats at idle. So i just replaced poppet valve kit, thermostats, and the heat sensors. I hooked up my hose to the flush out port and water came streaming out of the tell tale like normal. So i hooked up the muffs and i get a stream after about 30 seconds, but then verry steady. Then off to the lake i went. Started the motor up in the water and could not get a stream. My block pressure with the muffs on is 1.0 at idle and only 0.1 or 0.2 while in the lake
Any ideas would be greatly appreaciated, opener is only 3 days out and im getting scared.

[Hot Runr Guy]

this is just a wild guess, but since you are getting flow with water pressure from the garden hose/muffs, but not from the motor itself, I'd pull the lower unit back off and see if you forgot to install the key that locks the impeller to the driveshaft.
HRG

[warhorse]

I just pulled the lower unit and pump housing and found my impeller tore on two fins 3/4 the way down and the top of the housing melted. Im pretty sure i installed it correctly becouse i have put about 15 hrs on this impeller. Can they go bad that quick?

[Jerryv]

It only takes a few seconds if they are run without water in them. The melted housing indicates that.

Jerry

[Hot Runr Guy]

you also indicated a while back that you started the engine only 20 minutes or so after laying the silicone bead, that keeps the exhaust gases out of the pump housing. Sounds like it's time for a new full kit.
HRG

[Shellback]

I hooked up my hose to the flush out port and water came streaming out of the tell tale like normal. You didn't run the motor while on the flush port did you? You shouldn't run the motor that way as the impeller doesn't get water.

[warhorse]

Originally Posted by Shellback

I hooked up my hose to the flush out port and water came streaming out of the tell tale like normal. You didn't run the motor while on the flush port did you? You shouldn't run the motor that way as the impeller doesn't get water.

No i havn't run it that way, I just turned the water on to see if the tell tale was pluged. I just replaced the bad impeller, gaskets and housing. It still took about a min with the muffs on to get water to come out the tell tale, and it wasnt a verry strong stream. The temp never went above 155 with the muffs. Then i put a tank of water under it with the inlet screens completly under water and nothing comes out. Could there be any other reason for it not picking up water on it's own?

[warhorse]

Someone told me a couple years ago that the opti's take a while to fill the system with water, but i have seen others start spitting water right away.

[Hot Runr Guy]

Originally Posted by warhorse

Then i put a tank of water under it with the inlet screens completly under water and nothing comes out. Could there be any other reason for it not picking up water on it's own?

If you are going to tank-run an OB, you need to submerge the water pump, not just the inlets. I have not seen one that is self-priming. Basically, you need to get water over the cav plate level, where the pump is.
Hope you haven't melted another impeller.

HRG

[warhorse]

I hope so too Thanks. Do you know how long it should take water to come out the tell tale. Every time i launch the boat it takes about a min for water to come out even if my temp is up to 150 could this be normal or could i have an underlying issue other than the impeller.