Hot day problem

[jodysman]

I have a 1992 50hp Evenrude that shuts down only in hot weather.Local mechanic has crecked everything,water discharge temp ect.It never happens in the morning.Here in Florida it gets hot by noon.The motor is black and is very hot to the touch before starting.I have discovered that if I put an old towel over the motor before starting home and pour cold water over it for a short time,It never starts shuting down.The local guy thinks there is a senser somewhere that is telling the motor to shut down.(He is not the sharpest knife in the drawer) Any help will be appreciated. Jodysman

 

[1946Zephyr]

Re: Hot day problem

It sounds like you have a cooling problem. I would check the thermostat and make sure it isn't stuck. While it's out, run the motor for a few seconds and see if water comes gushine out.

 

[tashasdaddy]

Re: Hot day problem

does it act up when you take it for a long, 3-4 mile run? there is not a shut down sensor, it could have a slow mode sensor, which limits rpms to 2500 when it runs hot. being a cool motor after sitting, makes no sense to me.

 

[psteurer]

Re: Hot day problem

You very likely have a cooling problem. When it shuts down I presume you mean the rpms drop down to a fast idle. That is the SLOW feature getting activated to prevent overheating damage and I guess this motor has that. I think the SLOW feature activates when the engine temperature gets to around 185 degrees F.

There are a couple of simple tests you can do. Check the pee stream. If it is weak, the problem is likely down in the water pump area or the pipe leading from there. Next when the engine is running, remove the cover and put your hand on the top of the cylinder block. If it is too hot to touch and the engine is peeing strong, then you could have a problem with the thermostat or a blockage in the cooling passages around the cylinders. Try removing the thermostat and looking into the hole. If you see all kinds of crude, that is a sure sign of a blockage in the cooling passages. You can remove the cylinder head to clean out the gunk around the outside of the cylindes. But I have heard that products such as Salt Away can be used to maybe flush out some of the blockage.

 

[Bob_VT]

Re: Hot day problem

Okay........ what is a hot day???

Welcome to iboats!! Hot to me is anything above 32 degrees