Evinrude 9.5 how long until thermostat opens

[doors67us]

Hey all ,just got a 1969 Evinrude sportwin 9.5 got it running still in the fine tune stages,but I'm wondering how long it needs to run before the thermostat opens up,it seemed warmer than I thought it should be,new water pump impeller, gasket,gear case rebuilt, never owned a outboard with a thermostat,so I'm not sure

 

[racerone]

Take the thermostat out and test it.-----They are often missing or stuck open.-----Tested one last week that refused to open in boiling water.-----Should be open at about 160F

 

[saltchuckmatt]

Hey all ,just got a 1969 Evinrude sportwin 9.5 got it running still in the fine tune stages,but I'm wondering how long it needs to run before the thermostat opens up,it seemed warmer than I thought it should be,new water pump impeller, gasket,gear case rebuilt, never owned a outboard with a thermostat,so I'm not sure

Pretty quick...couple of minutes maybe

Invest in one of these.

 

[doors67us]

Pretty quick...couple of minutes maybe

Invest in one of these.

I've considered buying on the those,it ran for around 3-5 minutes,it was way warmer than my 18hp ever got ,don't think the thermostat had ever been replaced, original OEM,had a hell of a time getting it out

 

[saltchuckmatt]

I've considered buying on the those,it ran for around 3-5 minutes,it was way warmer than my 18hp ever got ,don't think the thermostat had ever been replaced, original OEM,had a hell of a time getting it out

Yes, well your cooling passages could be plugged up as well.

 

[doors67us]

Yes ,never really considered that,what's the odds of that happening tho? And if so what's the best option to clean them out ?

 

[saltchuckmatt]

Yes ,never really considered that,what's the odds of that happening tho? And if so what's the best option to clean them out ?

High if it's salt water use and not flushed regularly.

Pull off the head and water jacket and clean. Try the t-stat first maybe you will get lucky.
Also, your motor might not even be running hot because your guessing.

You'll get there.

 

[doors67us]

I don't think it's ever been used in salt water,but say 100% just ogt it two weeks ago,and yes that's what I'm going to start off with,is a new thermostat, my 60 18hp runs cool,can lay my hand on the power head it's nice and cool ,this 9.5 was considerably warmer,need to get a non contact thermometer that'd help

 

[tphoyt]

What makes you think it’s not opening?
Is it not pumping water or you just think its hot?
It should still pump even before t-stat opens

 

[doors67us]

It's pumping water good enough,it just seems warmer than I think it should be, compared to my 60 18hp Evinrude,gonna test the stat and see if it opens

 

[racerone]

The 18 should be running quite warm.------These thermostats are often neglected.----I see many stuck open !

 

[doors67us]

The 18 should be running quite warm.------These thermostats are often neglected.----I see many stuck open !

My 18 doesn't have a thermostat, from what I can tell it's OEM from 1969 on the 9.5 ,it's just something new I've never dealt with before

 

[racerone]

The early 18 HP did not have a thermostat.----- From 1959 and newer they all had one.

 

[doors67us]

Mine is a 1960 model 15032

 

[racerone]

The 1960 model 18 HP came with a thermostat from the factory.

 

[doors67us]

Wonder why mine doesn't have one then?

 

[racerone]

People take them out all the time.-----They just don't know !

 

[doors67us]

Perhaps so,but the 18hp runs and cool great engine

 

[racerone]

Agreed----That is why they did not make many changes for 15 years or more.----Easy to maintain and parts are everywhere.

 

[Crosbyman]

leroy'S has a good write up on 9.5s

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