1975 70hp overheat

[70 johnson]

new water pump thermostate and added telltale ran super cool first day with new pump and added telltale now it runs hot pulled lower off 5 times its connected to pick up but wont come out thermeostate housing with cover off and i back flushed it out after new pump any ideas would be awsome

 

[patrick4266]

Re: 1975 70hp overheat

Take a garden hose and put it on pick up tube and turn the water on. Water should then come out of tell tale, if not something is clogged up. If it does then check key on impeller.

 

[70 johnson]

Re: 1975 70hp overheat

itoday i got another impellerit worked for 1min and spun they gave me a plastic key and it seemed to big and different shape so i dropped lower again and used old one with old key and that didnt work the new one was sierrea should i try oem thanks any ideas would be great thanx

 

[James R]

Re: 1975 70hp overheat

If the pump housing or plate is scored a new impeller will work for a short time and then nothing.

 

[patrick4266]

Re: 1975 70hp overheat

The kits i got always had two keys a black one and a white one. Another thing those impellers have to be put in right side up. Look in the key hole of the impeller, turn it over and look again you will see a diference. Make sure you put it in the right way.

 

[James R]

Re: 1975 70hp overheat

If I recall correctly those impellers use a weird arced plastic key. If that is so then it is possible to put the impeller and key upside down. Then the Impeller will spin on the shaft. Take a good look.