Oil temp gauge & sender

[redstrosekNic]

G'day,

Just wondering if you fellas could answer a quick question for me. I am not sure if my oil temp sender and gauge are matched up properly. If I take the sender out of the car and put it in boiling water, can I use the place where 212*F shows up on the gauge as a reference point to estimate other temp markings on the gauge, even if the sender is not correctly matched to the gauge? Would the readings be off equally across the gauge range?

I think my gauge might be off because my trombone is getting oil when the temp gauge reads as follows...(sorry for the crappy cell phone pic)



I don't think this is the correct style of gauge for my car anyway...

Lastly, does anyone know the specific torque spec for the temp sender when re-installing?

Many thanks Pelicans!

[redstrosekNic]

Bump

[80-911SC]

Look on the back of the gauge and put the numbers down here .. that will tell what gauge you have .. than someone here will be able to tell you what sender you should have ...

If you can get the ohm reading off the sender when its cold and when its hot some one may be able to ID the sender .. I don't think they have a number on them .. but if you do that would help ...

I know the white face is not correct for any car (personal opinion) but the gauge may be right ....

Steve

[scotricker]

Me, too.

I also need to calibrate my gauge and sender on my 78 SC. I know I can buy a new set from Pelican, but thought I'd try to figure out where I'm at now with my non-numbered set. The gauge and sender work, I just don't know what the real temps are. I have this gauge now:



I am not sure if the sender matches this gauge since there have been several PO's. So, I'm thinking that I want to remove both the sensor and gauge to calibrate them and make some real numbers marks.

How about heating cooking oil on the stove and use the IR laser thermometer? Then have the gauge hooked up to 12 volts over on the kitchen counter. Can I heat cooking oil hotter than boiling water? Like up to 250 degrees or more?

Not sure about hook-up connections though. Any set up diagrams available?

[86 911 Targa]

Originally Posted by scotricker

Me, too.

I also need to calibrate my gauge and sender on my 78 SC. I know I can buy a new set from Pelican, but thought I'd try to figure out where I'm at now with my non-numbered set. The gauge and sender work, I just don't know what the real temps are. I have this gauge now:



I am not sure if the sender matches this gauge since there have been several PO's. So, I'm thinking that I want to remove both the sensor and gauge to calibrate them and make some real numbers marks.

How about heating cooking oil on the stove and use the IR laser thermometer? Then have the gauge hooked up to 12 volts over on the kitchen counter. Can I heat cooking oil hotter than boiling water? Like up to 250 degrees or more?

Not sure about hook-up connections though. Any set up diagrams available?

Hope this helps:

Porsche 911 Technical Forum - Pelican Parts Technical BBS

Good luck,

Gerry

[redstrosekNic]

Originally Posted by 80-911SC

Look on the back of the gauge and put the numbers down here .. that will tell what gauge you have .. than someone here will be able to tell you what sender you should have ...

If you can get the ohm reading off the sender when its cold and when its hot some one may be able to ID the sender .. I don't think they have a number on them .. but if you do that would help ...

I know the white face is not correct for any car (personal opinion) but the gauge may be right ....

Steve

The only numbers I could find look like a date... 36 then below, a 2.75. Do I have to remove the oil temp gauge from the combo gauge assem. to get to the number I need?

I took the sender out and it has a few numbers. It says it is a 150*C sender, has a date like number (12.74), and lastly has the Porsche part number of 901 841 632 00. The Porsche part number doesn't match anything when searched in the Pelican Parts catalog.

I'm going to put the sender in some boiling water on a hot plate, and see where the current gauge reads. Using another thermometer, I will also vary the temp of the water and check the gauge position.

Thanks for the reply!

[redstrosekNic]

911 Oil Temp Gauge - YouTube

This shows what my gauge reads when the sender is at 212*F. I also turned the hotplate down and took a reading of the water with another thermometer. At about 185*F, the gauge read about two needle widths below the 1st hash after the bottom block on the gauge...

I was always afraid I was running hotter! My car reads about 1-2 needle widths above the 212*F point only after idling in traffic for awhile when the ambient temps are 85*F+. The car struggles to reach the 1st hash after the bottom box mark when cruising during ambient temps of 70-80*F.

[redstrosekNic]

Scotricker, watch my video and try the procedure. I wouldn't worry about trying to test the sender above 212*F unless your car reads substantially higher than the corresponding temps produced on the gauge using the boiling water method.

Good luck!

[scotricker]

that looks like it will work for me, too. thanks for posting the video!

[scotricker]

Gerry, can you send a longer link please? I just got back to the general tech forum. thanks

[schumicat]

look at the new vintage USA website and it will show you what the numbers are on the unmarked gauges. also for $15 you can buy a long meat thermometer or a cheap mechanical (not electric) oil temp gauge and drop the sender in the oil tank. that will tell you what the temp is and whether the gauge is consistent.

[86 911 Targa]

Originally Posted by scotricker

Gerry, can you send a longer link please? I just got back to the general tech forum. thanks

Here you go:

911 Gauge module overlays

[redstrosekNic]

Does anyone know the proper torque spec for the oil temp sensor? I searched, and only found 18.4 ft/lbs, which seems very high... It broke loose very easily, so I just put it in snug.

Thanks

Edit:
I searched the tech articles and found that 18.4 ft/lbs is indeed correct for torquing the oil temp sender...