Engine will not heat up

[Brock96]

1st time user and I could you some help - please

Boat - 1979 Carver Monterey 27ft - Mercruiser 228 305 4bbl - Alpha drive

Engine will not heat up - running cool - thermostat was tested before installing (had to use 2 gaskets)
Exhaust Manifold and thermostat housing luke warm - Intake manifold is cold - Lake Ontario is cold

Any thoughts will appreciated

 

[alldodge]

Is this your cooling system?


Design 1 is the thermostat housing?

 

[j cat]

1st time user and I could you some help - please

Boat - 1979 Carver Monterey 27ft - Mercruiser 228 305 4bbl - Alpha drive

Engine will not heat up - running cool - thermostat was tested before installing (had to use 2 gaskets)
Exhaust Manifold and thermostat housing luke warm - Intake manifold is cold - Lake Ontario is cold

Any thoughts will appreciated

the T stat is 143F .. then you put in the hot water to 170F and the T stat is fully open ..
now the T stat ..then the water runs around the circumference area..

 

[Brock96]

the T stat is 143F .. then you put in the hot water to 170F and the T stat is fully open ..
now the T stat ..then the water runs around the circumference area..

Yes I did do that and the T sat opened up. I actually did it with 2 t stats - same result when installed - the Intake manifold just stays cold
This has got me real confused

 

[dubs283]

..then the water runs around the circumference area..

Not how a thermostat works. In fact your post makes little to no sense

Hot engine water leaves the block through the center of the t stat, not around the edge. The outer edge of the t stat is stationary in the housing.

Something isn't put together correctly and water is most likely flowing past the t stat.

Look closely at the diagrams dodge posted, this is the beginning step of your troubleshooting process

 

[j cat]

Yes I did do that and the T sat opened up. I actually did it with 2 t stats - same result when installed - the Intake manifold just stays cold
This has got me real confused

did the t stat around the circumference area have a leak around it ...
the cold water then was flowing a small amount of the T stat area then the engine water temp will move to the T stat area ..then the temp will rise around 140F .. the cold water is very cold now and the T stat will probably not increase the engine temp to 140F..

 

[achris]

If you're going by just the temp gauge and 'touch', then you need to get an IR gun to actually check the temps.

I doubt you have 2 faulty thermostats, especially since you hot water tested them. Possibly a bad 'ground' circuit in the temp gauge. Check continuity between sender body and engine ground (or better still, the battery negative terminal)....

Chris......

 

[Brock96]

Not how a thermostat works. In fact your post makes little to no sense

Hot engine water leaves the block through the center of the t stat, not around the edge. The outer edge of the t stat is stationary in the housing.

Something isn't put together correctly and water is most likely flowing past the t stat.

Look closely at the diagrams dodge posted, this is the beginning step of your troubleshooting process

To all - I just took apart the Thermostat housing and Thermostat and how do I say this - I may have screwed up. Last year I changed the thermostat -when I put it back together it leaked - so I added another gasket and the leak stopped. Taking a look at what I got now is I don't think there is a good seal around the thermostat flange. ( I also think I may not have tightened down the housing evenly.
So I will get another gasket and gasket sealer and see what happens and reply to all

 

[Bondo]

To all - I just took apart the Thermostat housing and Thermostat and how do I say this - I may have screwed up. Last year I changed the thermostat -when I put it back together it leaked - so I added another gasket and the leak stopped. Taking a look at what I got now is I don't think there is a good seal around the thermostat flange. ( I also think I may not have tightened down the housing evenly.
So I will get another gasket and gasket sealer and see what happens and reply to all

Ayuh,..... You need the proper gasket under the housing, with the brass rivets, to ground the housing, so the sender can tell the gauge where to point too,.....

 

[Brock96]

Ayuh,..... You need the proper gasket under the housing, with the brass rivets, to ground the housing, so the sender can tell the gauge where to point too,.....

Thks - I do have that one

 

[achris]

And no thread tape....