Indicator stream temp.?

[Chadgro]

I have an old m9.8.a tohatsu.
I hear that the temp of the water stream coming out should not be very warm.
On the otherhand the thermostat doesn't open until about 140f.
Does this mean that the stream should be 140f +or-.
Thats pretty hot. I took the thermostat out as a test and the stream is much cooler.( is this dangerous for engine?)
Thanks for any advise.

 

[pvanv]

Re: Indicator stream temp.?

The M9.8A needs a stat for both adequate temperature rise (otherwise you will foul plugs), and for proper cooling water distribution (hot and cold spots in the cooling system).

The pee tube is before the stat, so only shows pressurization from the pump, regardless of stat operation. Yes, it will likely be cooler without a stat.

 

[TOHATSU GURU]

Re: Indicator stream temp.?

No parts are available for the 9.8 A so be careful.

 

[Chadgro]

Re: Indicator stream temp.?

Thanks guys .
after a little research, i put the stat back in.
I soaked it in viniger etc and tested it .
it starts to open at about 130f.
Seems good.
I havn't tested it under a load (in Ocean temp. of 60-65f) but when i'm out if the pee stream feels like hot tap water 130 or so do you think it is a sign that it is running hot? I've heard that ideally it should just be a little warm (In the trash can that seems to be the case).
Thanks for the tip about parts.

 

[pvanv]

Re: Indicator stream temp.?

"Warm" is a judgement call. Cold at start, them warm as the motor comes up to temp is what to expect. Steam is bad, of course.

 

[TOHATSU GURU]

Re: Indicator stream temp.?

I've always determined where the temp should be by using the following method.

If the water is cold, you haven't been running it long enough.
If the water is warm, you probably haven't been running it long enough.
If the water is hot, but not enough to leave a blister, its just right.
If the water is scalding, Houston, we have a problem.