115 not running hot enough

[rfiglia]

I have a 1984 115 Evinrude. The engine is running below normal operating temp. I have the OMC temp gauge hooked up. It does not even go up to where the numbers start at 120 degrees.Normal range is 140-160 degrees. Its only running around 100 degrees. I just installed everything in the themostat cover new (thermostats,grommets,relief valves and springs) I took it out on the bay this morning and it still does not get hot even running at 4500 rpm. The heads are only warm to the touch. Whats next ? Thanks, Rich

 

[tashasdaddy]

Re: 115 not running hot enough

is the themostat up side down. if up side down the water pressure will push it open. keep it running cold.

 

[rfiglia]

Re: 115 not running hot enough

im going to pull the cover off tomorrow. I dont think its possible to install them backwards, but something is not right. Any other thoughts? Thanks, Rich

 

[tashasdaddy]

Re: 115 not running hot enough

where are you running, is the water still extremely cold.

 

[rfiglia]

Re: 115 not running hot enough

water is 45 degrees, but that should not effect anything. I also ran it in my driveway in a garbage can and the water was warm.. same results. Rich

 

[rfiglia]

Re: 115 not running hot enough

any other ideas? Everything was fine under the cover.... Rich

 

[rfiglia]

Re: 115 not running hot enough

anybody? :%

 

[tashasdaddy]

Re: 115 not running hot enough

are you sure the guage is accurate, connected properly. did you check the thremo in a pot of hot water and a candy thermo. look printed on the thremo. temps are stamped on the flange. not the first time the wrong one got into the wrong box.

 

[rfiglia]

Re: 115 not running hot enough

Hi, the gauge is a brand new OMC. It is hook up correctly. It has 2 themostats (V-4) They are brand new OMC and are working fine. The best way to test is to feel the heads while running. They are cool to warm. They should be hot to the touch when running at the normal 140 to 160 degrees. These v4's are notorious for running a little hot so this is why I can not figure this one out. Rich....

 

[emdsapmgr]

Re: 115 not running hot enough

My Michigan V6 will cool down to around 100 when running high speed at this time of the spring with the pressure relief valves open. What temps does it run at idle? Mine runs 120-125 at idle in the spring and 150 in the middle of summer.

 

[rfiglia]

Re: 115 not running hot enough

even at idle its cold...my mechanic friend with over 30 years owning an OMC shop is stumped.

 

[emdsapmgr]

Re: 115 not running hot enough

Did the mechanic use a laser gun reader to determine the engine was running cold, or are you referring to the temp guage? Bombardier does make two temp guages, one for outboards, one for stern drives. Also, possible the senders are different.

 

[rfiglia]

Re: 115 not running hot enough

I have the right gauge..dont need a laser gun to know its running cold, feeling the heads and they are luke warm ...Rich

 

[DHPMARINE]

Re: 115 not running hot enough

Don't really know how accurate your hand is.Has it been recently calibrated ?

You really need a way to read the temp.

160 degrees is three points below overheat.

Overheat is melt down.

DHP

 

[rfiglia]

Re: 115 not running hot enough

trust me its running cold... please stop responding and asking me how do I know its running cold. I need some responses of what the problem could be. Thanks, Rich..

 

[DHPMARINE]

Re: 115 not running hot enough

Well we did stop responding.(till now). I just know many times I have felt an engine was too hot or cold by hand,and melt sticks and thermal gun have proven me wrong.

DHP

 

[rfiglia]

Re: 115 not running hot enough

I am using the thermal sticks..

 

[DHPMARINE]

Re: 115 not running hot enough

Temp sticks are great indicators. What temps don't melt / do melt ?

Maybe we can work on this.And help.

DHP

 

[kynolan2183]

Re: 115 not running hot enough

OK, I am going to try and help you a little as the devils advocate.

1. Is the motor running fine at idle?
2. Is the motor running fine at high speed?
3. Is fuel consumption a little higher than expected?

I ask these questions because.

Rule #1 is
If it ain't broke don't fix it.

a 115 should use around 11.8 to 13 Gallons of gas per hour at wide open trottle. If you are on the upper end of the GPH then you are running rich which is good. Two strokes need to run rich. Also a rich engine will run cooler, a lot cooler.

From what I read your compression was out standing (160?).
Also remember that a cooler running engine will produce more ponies to the prop and will last longer.

Take two theoretically identical engines and run the math on them.
one at 115 degrees and one at 150 degrees and you will see about a 5% difference in horse power. That is why they sell cold air intakes for cars and low temp thermostats

My 70hp evinrude runs cold and I am glad it does for several reasons
The cylinders have greater compression than they would at normal temps.
There is a greater safety time if it does start to over heat
If a carb got some junk in it and started to run lean then my chances of really hurting the engine are lower.

I hope I have helped you some
Let me know if it is not running good at idle and I can help you with that.

Kyle

 

[kynolan2183]

Re: 115 not running hot enough

by the way the temp sticks by evinrude melt at 125 and 163.

the book says that with the engine in gear the 125 stick mark should melt or the thermo is stuck open and the 163 mark should never melt at wot running across the water.
By the way 125 degrees might be just warm to the touch.