How does the oil pressure sender work on a Jeep CJ?
The oil pressure sender is similar to the fuel gauge sender. The mechanical parts are different, but after that it is basically a coil of resistance wire wrapped around a card and the wiper moves across the winding to change the resistance. The higher the fuel level or engine oil pressure, the lower the resistance.
Why does the CJ gauge read higher with higher oil pressure?
The higher the fuel level or engine oil pressure, the lower the resistance. With less resistance, more current flows and the gauge reads higher. The oil pressure sender and fuel sender are both electro-mechanical devices but the temperature sender is not. The temperature sender is a temperature dependent resistor (Thermistor).
How to check oil pressure in a jeep?
Click to expand… If i have a sticker on the inside of my hood or core support (dont remember which) with a number hand written on it, saying “This vehicle has had modifications done… blah blah blah” and its a Chrysler sticker, is there a way i can look up that number and find what was done to it?
What should the sender gauge read on a Jeep CJ?
It is an oil pressure switch that is supposed to close below 4 psi to activate a dash warning light in some speedometer clusters. To be sure the problem is not the gauge, you can momentarily short the wire from the output of the Sender to ground. If there is no resistance, your gauge should read 80 psi.
The oil pressure sender is similar to the fuel gauge sender. The mechanical parts are different, but after that it is basically a coil of resistance wire wrapped around a card and the wiper moves across the winding to change the resistance. The higher the fuel level or engine oil pressure, the lower the resistance.
The higher the fuel level or engine oil pressure, the lower the resistance. With less resistance, more current flows and the gauge reads higher. The oil pressure sender and fuel sender are both electro-mechanical devices but the temperature sender is not.
It is an oil pressure switch that is supposed to close below 4 psi to activate a dash warning light in some speedometer clusters. To be sure the problem is not the gauge, you can momentarily short the wire from the output of the Sender to ground. If there is no resistance, your gauge should read 80 psi.
What should the temp gauge be on a Jeep CJ?
The Jumper/Regulator Strap is composed of two strips of metal that continuously make and break contact, regulating the output to the Temp gauge to 5 volts. A volt meter applied to the A terminal on the Temp gauge should fluctuate (plus and minus) near 5 volts.
Why are all the Jeep CJ gauges dampened?
The dampening mechanism is basically some thick grease on the movement’s pivot points. The reason all the meters are dampened is because the senders do not have a very constant resistance. If you put a good testing meter on the sender while the motor is running you will see the resistance bounce all over the place.
What’s the meter movement on a Jeep Cherokee?
There are some slight variations with the Jeeps built from ’72-’75, but starting in ’76 things remain pretty consistent for 10 years. The meter movement in all the gauges have a built-in dampening mechanism which keeps the needle from bouncing around. The dampening mechanism is basically some thick grease on the movement’s pivot points.