View Full Version : Low engine temp??

06-01-2011, 11:27 PM
Was out tonight.
And noticed the engine temp was running way cool 100-130 degrees.It normaly is right at 160.
And somtimes it would fluctuate.
River temp was 73.

Anyone have this problem before??...Maybe a suck thermostat?.I donno?

Also hit a submerged branch and now I think my rudder box is leaking....So I got that going for me too.

06-01-2011, 11:37 PM
Thermostats are designed to fail in the open position, so if you can't make operating temp it's probably time for a new thermostat.

Submerged things suck. Sorry about that one...

06-01-2011, 11:38 PM
BTW, nice boat! She looks somewhat familiar :D

Hoosier Bob
06-01-2011, 11:39 PM
Every couple of years my T-Stat goes crap. 120 max. Boat also does not run like it should that cold. Get a new one and a couple spare gaskets at Skidim. You can't burn the fogging oil off at 120!

1975 Classic
06-02-2011, 01:20 AM
That's right where it'll run with thermostat stuck open

06-03-2011, 07:26 PM
Put the new thermostat in tonight and ran the boat on the garden hose.All seems to be fine temp was at 160-165.
Real test will be tommorow.On the water

Thanks for the replys

07-12-2011, 12:07 AM
Been running the new thermostat now for a while with no problem.Then sunday I noticed the temp was low again 100 degrees.

So now I'm thinking my water pump is going out.....what do ya'll think??

07-12-2011, 12:12 AM
I doubt your water pump is going because you get a low temperature. Gauge or thermostat but not water pump. Water pumps go out--engine gets hot or the water pump leaks.

07-12-2011, 12:20 AM
Thats what I was thinking.If the water pump goes it usally leaks.
The thermostat is new.......Maybe my gauge is sticking?

07-12-2011, 12:51 AM
Weird... seems strange your problem would be fixed [albeit temporarily?] after replacing the thermostat the 1st time.

Maybe pull the t-stat and test it in a pot on the stove? Make sure it actually opens/closes and that it is not bunged up with weeds, fishing line, etc...

Just throwing some thoughts out there... :confused:

07-12-2011, 12:50 PM
Did you check your thermostat for debris? When mine stuck open, it was a piece of old impeller that lodged in there. Might be a good idea to look at your strainer and clean it, maybe debris is getting through? Kind of along the same train of thought as G-Star, but thought I would add my experience.

07-12-2011, 01:04 PM
is there places to clean out where water goes into the engine?

07-12-2011, 01:45 PM
Probably not a help on your boat since mine was a LT1 motor. But for the LT1 the strainer was at the transmission cooler, which was between the intake hose and the hose to the water pump. It was several years ago so I don't remember what else I did. Hope that helps.

07-12-2011, 06:09 PM
I checked the trans cooler strainer and there was alot of debris.So maybe something is stuck in the thermostate.
I'll check it out.


07-13-2011, 07:19 PM
Pulled the thermostat out tonight and there was some debris in there weeds,tiny wood chips.So Instead of cleaning it out I bought a 160 theremostat and put it in.Fired the boat up on the garden hose and she hit 155-160.Seems to be fine now.

Thanks for the replys.