 Oil temp gauge misbehaving |
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| Bogaat |
 Mar 27 2007, 11:03 AM
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#1
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Member  Group: Members Posts: 195 Joined: 8-January 07 From: Charleston, SC Member No.: 7,436  |
It seems to be getting hot to the touch and just barely registers a temp change after the engine is warmed up. I haven't checked a thing yet, but thought I would ask for input. Thanks all...is it Friday yet? (IMG:style_emoticons/default/beer3.gif)
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| SirAndy |
Mar 27 2007, 11:26 AM
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#2
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Resident German Group: Admin Posts: 41,651 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Bogaat @ Mar 27 2007, 09:03 AM)  It seems to be getting hot to the touch and just barely registers a temp change after the engine is warmed up. I haven't checked a thing yet, but thought I would ask for input. Thanks all...is it Friday yet? (IMG:style_emoticons/default/beer3.gif) hooked up wrong? maybe? "G" does *NOT* stand for ground!!!! it stands for "Geber" which is german for "Sender", meaning "G" should be connected to the sending unit, + should go to 12V and - should go to ground ... (IMG:style_emoticons/default/smile.gif) Andy |
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| terrymason |
Mar 27 2007, 12:52 PM
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#3
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Member Group: Members Posts: 346 Joined: 23-November 05 From: Virginia Beach Member No.: 5,174 |
My car does the same thing. The stock temp gauge barely moves when the car's warmed up. I just bought and installed a CHT gauge, and it seems to be pretty accurate. It will get up to 325 before my stock gauge does anything.
http://www.cbperformance.com/catalog.asp?ProductID=1198 |
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| sk8kat1 |
Mar 27 2007, 01:00 PM
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#4
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Senior Member Group: Members Posts: 911 Joined: 10-October 05 From: belvidere ,IL Member No.: 4,937 |
QUOTE(terrymason @ Mar 27 2007, 10:52 AM) My car does the same thing. The stock temp gauge barely moves when the car's warmed up. I just bought and installed a CHT gauge, and it seems to be pretty accurate. It will get up to 325 before my stock gauge does anything. http://www.cbperformance.com/catalog.asp?ProductID=1198 isn't 325 kinda on the hot side .. mine used to hang out at like 280-ish (IMG:style_emoticons/default/blink.gif) |
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| John |
Mar 27 2007, 01:05 PM
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#5
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member? what's a member? Group: Members Posts: 3,393 Joined: 30-January 04 From: Evansville, IN (SIRPCA) Member No.: 1,615 Region Association: None |
That sounds like a typical gauge/sender mismatch (or a failing sender or gauge).
The gauges/senders were for the most part matched. I know between 1973 and 1974, they changed gauges (moved the red mark to give the needle a broader swing before it got to the red area), and they also changed senders. The 1974 had more range (the needle moved more for a given temp). I think the real change was the sender. On another note, I briefly had 2 gauges wired to the same sending unit and both gauges displayed almost exactly 1/2 what they should have. |
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| 914Sixer |
Mar 27 2007, 08:37 PM
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#6
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914 Guru Group: Members Posts: 8,886 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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The wire to the senders get brittle from engine heat. The voltage does not pass as it should, therefore the temp will be off. In the telephone business we have what are know as High Joints. They let the signal (voltage) pass but it causes distortion. The wire is making intermittent contact because the voltage is jumping the small opening. The insulation of the wire is what holds the wire together to complete the circuit.
As for the difference in the guages, the temp scales are identical when you look at the range printed on them when you take them out of the case. The red lines are different though. The senders start and end at different temps. |
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| terrymason |
Mar 28 2007, 09:10 AM
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#7
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Member Group: Members Posts: 346 Joined: 23-November 05 From: Virginia Beach Member No.: 5,174 |
QUOTE(sk8kat1 @ Mar 27 2007, 11:00 AM) isn't 325 kinda on the hot side .. mine used to hang out at like 280-ish (IMG:style_emoticons/default/blink.gif) I"ve only run my car with the new cht gauge in it for 10 minutes, and the gauge showed 325, but it was about 55 degress out, so I guess that means the real engine temp was only ~300 I searched the forums up and down, and the only temp number I found was 400 (as in "at 400 degrees your engine will explode) |
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