Engine Temp

[Boilers2000]

Replaced my impeller last year, and when running on muffs water comes out or the side holes of the housing and its warm. In water I can feel warm water coming out as well. At idle engine seems like it's over heating, when running above 2k temp drops to 150-160. Engine is a 92 4.3LX. Could it be a thermostat no filly opening and it's needs higher RPM to move the water for cooling? Any ideas are appreciated.

 

[tpenfield]

Usually, it is a restriction in the flow of water that causes these situations. I would check any/all oil coolers along the intake path for debris that might be restricting the flow.

You can test the thermostat with a pot of water & thermometer on the stove to see at what temperature it opens

 

[alldodge]

Replaced my impeller last year, and when running on muffs water comes out or the side holes of the housing and its warm. In water I can feel warm water coming out as well. At idle engine seems like it's over heating, when running above 2k temp drops to 150-160. Engine is a 92 4.3LX. Could it be a thermostat no filly opening and it's needs higher RPM to move the water for cooling? Any ideas are appreciated.

So far not sounding like an issue at all.
The thermostat will not open until its at least 140* and your saying it stays 150-160. The hem gauges are not normally real accurate and can vary +/- at least 10*

 

[ROY WILLIAMS]

Replaced my impeller last year, and when running on muffs water comes out or the side holes of the housing and its warm. In water I can feel warm water coming out as well. At idle engine seems like it's over heating, when running above 2k temp drops to 150-160. Engine is a 92 4.3LX. Could it be a thermostat no filly opening and it's needs higher RPM to move the water for cooling? Any ideas are appreciated.

the engine was the head gasket ...inspecting it ..

 

[Boilers2000]

So far not sounding like an issue at all.
The thermostat will not open until its at least 140* and your saying it stays 150-160. The hem gauges are not normally real accurate and can vary +/- at least 10*

It stays there if RPMs are up but at idle ( less than 1k RPMs) temp feels like it continues to climb. Was idling in a slip getting everything loaded and noticed engine temp at 190.

 

[Boilers2000]

the engine was the head gasket ...inspecting it ..

Sorry, not following..you saying could be a bad head gasket?

 

[Boilers2000]

Usually, it is a restriction in the flow of water that causes these situations. I would check any/all oil coolers along the intake path for debris that might be restricting the flow.

You can test the thermostat with a pot of water & thermometer on the stove to see at what temperature it opens

Any suggestions for diagrams?

 

[Boilers2000]

Usually, it is a restriction in the flow of water that causes these situations. I would check any/all oil coolers along the intake path for debris that might be restricting the flow.

You can test the thermostat with a pot of water & thermometer on the stove to see at what temperature it opens

I think I have one power steering fluid cooler between in the stern drive and the thermostat housing. I'll poke around there.

 

[Boilers2000]

It stays there if RPMs are up but at idle ( less than 1k RPMs) temp feels like it continues to climb. Was idling in a slip getting everything loaded and noticed engine temp at 190.

Good call on the helm gauges, they are 30 years old so accuracy level could be questionable.

 

[alldodge]

Get a short piece (4 to 8 inch) of clear hose from the hardware store and a double barbed fitting and hose clamp. Disconnect the hose at the thermostat coming from the drive and put hose in between. See if you see bubbles with motor running

 

[ROY WILLIAMS]

Sorry, not following..you saying could be a bad head gasket?

the head gaskets of the cylinders of the air pressure gauge .. inspect it ..take the spark plugs take it off and then use the air gauge ... cranking it ..