Scuba need your expertise. I am looking at a boat with a 120 merc in order outbourd it is running fine at idle but want to over heat under load.
Posted By: Cragar
Re: Need info - 09/25/21 04:21 AM
Have you checked the impeller pump ?
It should be pumping a steady stream of water out the back.
Posted By: cmj
Re: Need info - 09/25/21 12:01 PM
You can buy a gauge to put in the dash to check the water pump pressure. Easy to install, a hose runs back to engine.
So if anyone has any advice on this please feel free to give it. I am thinking that there is a bloage in the outlet for the water because it runs fine at idle?
Pump is working fine the guy said it is new and is at factory flow I am beginning to think that there is a blockage in the output of the moter where should I look?
You’re probably going to have to check multiple things before you find the problem. Poppet, thermostat, exhaust manifold seal/gasket.
Scuba may not see this post. Click on the chat forum above and you'll see he has a thread going called Camp Scuba. He visits that thread daily. You could ask him there.