Thermostat

[fsr44444]

I bought a 1993 sportcraft with 217 hrs on the motor. The motor is a 570A. I had a water hose blow off a couple of times when I got up to 4000 rpm. When the boat is running this hose is so hard you can't squeeze it. I don't think this is normal.

I winterized the boat yesterday. In doing so I discovered it had a thermostat. Also, the stat was "cocked" in the opening. My guess is either somebody put it in wrong or something happened. I'm guessing this restricted the flow of water through the hose and this may be why the hose was so hard.

My questions:
1. Do I need the thermostat? I fish Lake Erie and cool water is always coming into the engine.
2. Is it normal for the water hose to get that hard or is something causing this to happen?
3. How normal running rpm can I run this engine? At 4000 rpm I still have more throtle. Besides having the hose blow off at 4000 rpm, I'm not sure if I should run any higher rpm.

 

[HT32BSX115]

Re: Thermostat

Howdy,

Welcome Aboard!

1. Do I need the thermostat? I fish Lake Erie and cool water is always coming into the engine.

Yes, The engine needs to operate at a temp that will ensure even temps throughout the block. Just dumping cold water into the engine with no regulation will cause hot and cold spots.

2. Is it normal for the water hose to get that hard or is something causing this to happen?

Be a little more specific as to which hose.

3. How normal running rpm can I run this engine? At 4000 rpm I still have more throtle. Besides having the hose blow off at 4000 rpm, I'm not sure if I should run any higher rpm.

Can't say. I don't know what a "570A" is........

In general, the engine should be able to make it to recommended MAX RPM. That doesn't mean you should operate continuously at MAX RPM.


Also, in general, if you have a raw water supply hose that has enough pressure to blow it off (and it's hard) there MAY be a restriction in the exhaust system (manifolds and/or risers) preventing a free flow of raw water out of the engine. If it gets worse, the engine will begin to over heat.

You might be a little more specific as to what you have.

When we know what you have, it'll be a little easier to suggest what you should look at closer.


Regards,


Rick