1973 25 hp cooling

[bonzoscott]

25R73A - Is there any way to tell if it is pumping water? Doesn't seem to have tell-tale. I know most say just change the pump, but if ordering parts... what if it's the thermostat?

 

[sludgeguy68]

Re: 1973 25 hp cooling

It should spray out of an outlet located on the back of the exhaust housing at all times, regardless if the t-stat is closed or open. If there's no water coming out, could be a bad impeller, or a blockage somewhere.

 

[kfa4303]

Re: 1973 25 hp cooling

+1. You also have to run it in a test tank with water filled up to about and inch or two below the main exhaust port as well. These old motors can't be run on muffs.

 

[bonzoscott]

Re: 1973 25 hp cooling

I had the water level just above the water intake and there was no water coming from the exhaust port. I was using a small waste basket as my test tank. I'll try a barrel tonight and check for water at the exhaust port. Thanks for the replies.