1993 Mercury 135 Cooling System

[Spectrum Rider]

Just wondering if anyone has any ideas how to tap into the cooling system to get a decent "tell tale" discharge on start up of these older mercurys. At startup I get very little spray out of the tell tale. I have been told that it is normal for Mercurys of this vintage. I would like to be able to tell at start up, that the engine is flowing water and not have to wait until the thermostats open.

 

[gss036]

Re: 1993 Mercury 135 Cooling System

Check your stats and see if there is a vent hole in them, if not go buy new ones that have the vents. Stats are only about 10$ each and a buck for the gasket. If they are the originals, they are over due for change anyway.
But what you are seeing is perfectly normal for that engine. Have you go a water guage guage? That is the best way to know whether your water impeller is working or not.

 

[studlymandingo]

Re: 1993 Mercury 135 Cooling System

Replace the stats, don't mess with anything that would interrupt the cycling of cooling water. I replace my impeller every season so I know I don't have to worry about that failure. I know that it takes some time for the tell-tale to go, and I check my pressure gauge to let me know I'm pumping adequately.

 

[Spectrum Rider]

Re: 1993 Mercury 135 Cooling System

Thanks for the help! I will try and find thermostats with the bypass holes. I would purchase these from Iboats but how will I know if they will have the bypass holes in them or not?

Check your stats and see if there is a vent hole in them, if not go buy new ones that have the vents. Stats are only about 10$ each and a buck for the gasket. If they are the originals, they are over due for change anyway.
But what you are seeing is perfectly normal for that engine. Have you go a water guage guage? That is the best way to know whether your water impeller is working or not.