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craigt

Oil Pressure Warning

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I should have done this years ago and I'm sure many will have already.

I've just fitted a small but loud audible warning to the low oil pressure warning light circuit in my SC. Took 10 minutes.

When I bought my first SC 6 years ago I inspected the car as best I could with the limited Porsche knowledge I had at the time. I drove it over 300 miles home and it ran sweetly. The following day I inspected the car up on stands and was horrified to see the 2 rubber oil hoses at the oil tank were severely perished ( how did I miss that).

Although I always keep an eye on the oil pressure, I feel that if a hose let go it would be too late before I noticed the gauge. An audible device will give instant warning and allow me to shut down the engine before damage is done. Something I hope I never use but provides a little peace of mind.

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This is the warning "buzzer" - £1.99 on ebay. A pretty sharp noise similar to the low brake pressure warning on an LGV. No point in it being a nice soft fluffy sound!!

IMG_20190531_145224.jpg.1be3506ff1b1049e74561efd4d7a8239.jpg

 

 

Initially it was fitted behind the gauges but i felt that at speed with the top off and the engine howling ;) I might not hear it so I extended the wires to allow it to be fitted outside the dash in the cabin.

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Remove the low oil pressure warning "OEL" bulb from behind the gauge. The green/white wire is earth - the red/black wire is positive on my car (best confirm +ve and -ve for yourself).

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Solder piggy back spades like these to the warning buzzer ends, this way you're not chopping into the wiring loom and it can be easily removed if you don't like the result.

IMG_20190531_152509.jpg.f9b78a28afd8023e1862e511f17fa80a.jpg

 

 

I removed the mirror control switch and passed the wires up behind the gauge so that the buzzer could be mounted under the dash so the sound couldn't be missed. I filed a small notch out of the mirror control switch hole to allow the wires to sit properly and allow the switch to be replaced.

IMG_20190531_151712.jpg.17d320b08529e6a7af53161cfd1db565.jpg

 

 

Now connect the buzzer piggy back connectors onto the bulb holder, it doesn't matter what goes where.

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Reconnect the cars green/white cable to the black connector of the new buzzer and the cars red/black cable to the red connector of the new buzzer as shown below.

IMG_20190531_153417.jpg.b98c38c659296c0f1d6a1e8965e33823.jpg

 

Test and refit the gauge. The buzzer will still work even if the bulb was to fail. Only failure of the pressure sender or wiring will prevent the buzzer sounding.

 

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Great idea but also worthwhile changing the pressure switch to a higher pressure or adjustable pressure type. The standard Porsche item closes when the starter motor turns the engine over. If the warning bulb illuminated at high engine speed the damage has been done.

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Damn, was that a waste of time then 😭

Aren't the pressure switches matched to the gauges? If you fit a different switch will the gauge read wrongly

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The sender near the fan controls the gauge. The sender at the flywheel end controls the bulb.

The modification you have made is often used on classic competition cars. For it to be of any use you end up with the buzzer sounding when the oil / engine are at operating temperature and the engine is at idle. This is not an issue on a competition car but would get a bit tedious on a road car.

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