LEGENDS > Engine Care & Tuning

Inoperative Oil Pressure Gauge

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CC57:
All,

Need some troubleshooting advice please.

Sealed motor Thunder Roadster, approximately 20 races on the motor. Oil & filter changed after 2 race weekends.

Went to roll out for the feature last Saturday (after running 2 practice sessions) and the Oil pressure gauge read zero. Red light was on the panel. Normally, at idle, around 25#s indicated on the gauge.  Revved the motor a couple of times and the red light went out, but gauge still read zero.

Thoughts running though head: just checked and added ½ quart of oil. Oil was 2/3 of the way up sight gauge.

Did I not re-install oil plug: yes I did. What else? Gauge failed? Did the sending until wire fall off or break? Or what?

And ---Decision time. Should I risk it (blowing engine) or sit out race? Well, adrenalin and sitting 2nd in track points….. I went for it.

25 laps later: engine didn’t blow but gauge still at zero.

So my question is, how do you trouble shoot the oil pressure gauge, sending unit/sensor? Where are the components? Is the sensor the brass cylindrical unit mounted on the left-hand side of the oil pan? (and if so, no wonder we run low oil pressure reading trough turns, all the oil is thrown to the right side of the pan)  How do I identify the proper wire? Can I place a voltage source on the gauge and test its functionality?  etc, etc.   

While I'm at it: the Oil temp hasn't worked since I bought the (used) car. How does one go about troubleshooting it?

Thanks in advance all

elimn8u_43:
I use mechanical gauges for both pressure and temperature. They are less likely to fail. I will see what I can dig up for information on the electrical gauges for you.

Geoff

Tom Cole:
The round sensor on the bottom underside of the oil pan is the oil level indicator unit.

The oil pressure  line on mine is the silver plug with the copper tube coming out of it.

If I crank the engine and unplug that line, oil squirts out.  If it doesn't squirt out of yours, you have a big problem.  If it does squirt out, then it is something to do with your gauge.

justfreaky:
 Try the tests on this page.
http://www.clarks-garage.com/shop-manual/elect-19.htm

 Sorry, only did a quick search, but thought it might give you some ideas.

 Steve

qweedqwag:
If the guages are mounted in the dash find out what is behind them, wires or a little thin plastic tube (for the pressure guage) follow that to where ever it goes and make sure you don't have a kink in the tube type    whic h is mechanical pressure, it should go down on the right side of the engine, if thaere are no kinks most likely the guage is bad, if you drove 25 laps without pressure you would have made it about three and BOOM!!! If the red light stays on while reving the engine parked you have problems, those lights dont fail that often, check the guage first.

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