1992 force 40hp cooling

[kprey73]

Hello all, I have a 92 40hp force I installed a new impeller and telltale, I am not getting to much water flow with muffs on. the old impeller came out in pieces.. with the new impeller after running 5-10 mins the temp buzzer goes off. I have not had the boat on the water yet because of this, am wondering if it were in a lake it would pump better.. or is something plugged?

any input would be great...

thank you

 

[jerryjerry05]

Re: 1992 force 40hp cooling




If the old impeller came out in pieces???
Then some pieces are probably still in the tube.
Try to clean them out.
The 40-50 needs a special muff.The big one doesn't seal right.
If the tube isin't clogged try taping the muffs and tape it good.

 

[Jiggz]

Re: 1992 force 40hp cooling

It doesn't cool on the hose neither will it at the lake. Check the water ckt again. You can actually get a right size hose and directly connect it to the tube in the mid-leg and should see cooling water go in and out. And then check the thermostat for blockages since the old impeller disintegrated.

 

[kprey73]

Re: 1992 force 40hp cooling

can I use air to blow out passages, or should I use water?? I pulled the l/u off and impeller is good (I just replaced it a couple weeks ago)

thanks again..

 

[Jiggz]

Re: 1992 force 40hp cooling

You can also use air but start at low pressure like 30 PSI. don't forget to check on the thermostat though for if a debris jam the thermostat the engine will always overheat because cooling water doesn't get routed properly.

 

[jerryjerry05]

Re: 1992 force 40hp cooling

Back flush from the thermostat housing.

 

[kprey73]

Re: 1992 force 40hp cooling

well I backflushed with both air and water through the t-stat hole, reinstalled the l/u and got it fired up and seems to pump water good now. not sure what was clogged in the water jacket or tube didn't see anything come out when backflushed.. I tested the t-stat and started opening up around 145 deg, will probably order a new one, can I run the motor w/o the t-stat til I get the new one?

thanks much for all the help...