Running hot

[johnca]

I have an 85 911 cab that has been running hot recently. The temp needle has steadily increases during startup as normal. Once I reach normal running temp the needle starts bouncing up and down in about 1mm increments. This continues as I drive and at a stop light and continues to register hotter and hotter. I have not let the needle pass the second tick on the temp gauge for fear that I'm running too hot. I'm getting good oil pressure and when I check the oil level it's halfway between high and low marks on the dip stick. All this happened pretty quickly in 80F weather in about 15 mins of city driving. Could this be a bad temp sender unit or bad engine thermostat ?

[47silver]

Are your oil cooler pipes hot that are at the fender mounted oil cooler?

[86 911 Targa]

Originally Posted by johnca

I have an 85 911 cab that has been running hot recently. The temp needle has steadily increases during startup as normal. Once I reach normal running temp the needle starts bouncing up and down in about 1mm increments. This continues as I drive and at a stop light and continues to register hotter and hotter. I have not let the needle pass the second tick on the temp gauge for fear that I'm running too hot. I'm getting good oil pressure and when I check the oil level it's halfway between high and low marks on the dip stick. All this happened pretty quickly in 80F weather in about 15 mins of city driving. Could this be a bad temp sender unit or bad engine thermostat ?

Check for a loose connection at the temp sensor on the right side of the engine,
near the crankshaft pulley.

Also the gauge connections Red/Black wires.

Let us know what you find.

pm me as needed.

Gerry

[johnca]

Are your oil cooler pipes hot that are at the fender mounted oil cooler?

They were warm to the touch. Also there was no "tick" from the engine when I shut the car off like there usually is from it being hot. I'm not sure if that helps at all with diagnosis? Is there a way to manually verify engine temp against the temp gauge ?

[johnca]

Quote de johnca

I have an 85 911 cab that has been running hot recently. The temp needle has steadily increases during startup as normal. Once I reach normal running temp the needle starts bouncing up and down in about 1mm increments. This continues as I drive and at a stop light and continues to register hotter and hotter. I have not let the needle pass the second tick on the temp gauge for fear that I'm running too hot. I'm getting good oil pressure and when I check the oil level it's halfway between high and low marks on the dip stick. All this happened pretty quickly in 80F weather in about 15 mins of city driving. Could this be a bad temp sender unit or bad engine thermostat ?

Have a look at the temp sensor on the right side of the engine,

near the crankshaft pulley.



Also the gauge connection Red/Black wires.



Let us know what you find.



pm me as needed.



Gerry

Gerry is there any chance you could post a photo ? I'm not sure what it looks like. Also is there something specific I should be looking for ?

[86 911 Targa]

Originally Posted by johnca

Gerry is there any chance you could post a photo ? I'm not sure what it looks like. Also is there something specific I should be looking for ?

From our '86 3.2.

Here you go...........



Check/clean connections.

pm me as needed.

Gerry

[DRACO A5OG]

Dr Gerry, knows :-)

[86 911 Targa]

Porsche 911 930 964 993 Oil Gauge Temperature Sensor Genuine New Warranty | eBay

[johnca]

Originally Posted by 86 911 Targa

Porsche 911 930 964 993 Oil Gauge Temperature Sensor Genuine New Warranty | eBay

Thanks Gerry, I was able to source one locally already for the same price. I will post an update after installation this evening.

[GH85Carrera]

Originally Posted by johnca

They were warm to the touch. Also there was no "tick" from the engine when I shut the car off like there usually is from it being hot. I'm not sure if that helps at all with diagnosis? Is there a way to manually verify engine temp against the temp gauge ?

They should be HOT as in burn you if the engine is 200 degrees, those oil pipes should be 200 degrees. If they are just warm, something is wrong.