Oil pressure issue

cobrarwanab

cobrarwanab

Club Member
I noticed my stock oil pressure gauge in my 85 mustang was periodically loosing all oil pressure. I installed an autometer oil pressure gauge and found i had 20psi at idol. I was also suspecting a cooling issue so i installed a water temp gauge as well. I installed an electric fan with a cheap auto-zone probe style coolant temp switch witch was to close circuit at 180*. When i tested the switch function with the gauge i realized my water temp was 215* and the fan was still off. I think i have my probe in the wrong spot so i am going to move it closer to the inlet of the radiator. My problem now is that after the coolant temp reached 215* my oil pressure at idol is between 9-10psi and only rises to 25psi under throttle. I am thinking the heat effected the oil pump and opened up the vain clearances thus the inability to create pressure? What is the rule of thumb for oil pressure? 1psi for every 1000rpm? and what would i like to see at idol ( 900-1000rpm) It is a stock pump from what the guy told me that sold me the car
 
has anyone else run into this? I have good oil pressure until coolant temp reaches 170* Then pressure drops to 7-10psi at idol and only 20-25psi during accel. Worn pump?
 
Does the engine use oil? How many miles/how tight is it?
While that is a little low for idle, its not really bad or out of the question, just low.
20-25 psi at accel, but monitor the RPM as well, if its within that range then its probably ok.
What kind of oil are you using?
 
Oil pressure

cobrarwanab said:
has anyone else run into this? I have good oil pressure until coolant temp reaches 170* Then pressure drops to 7-10psi at idol and only 20-25psi during accel. Worn pump?
Click to expand...

YES my 86 has the same problem but I did find out the guy that installed my motor used 5w30 in it.
 
You must log in or register to reply here.
Back
Top