68 Road Runner with 440 oil light coming on

[moparmusclecars]

I have a 68 Road Runner with newly rebuilt 440 that has no road miles but sat for about a year and a half before i started it again. Got her running and it idled rough at first then gradually got better. Blow some cat food out of the exhaust, apparently from mice. Yesterday I noticed after starting it the oil light was flickering on and off, and at times did more staying on. I have only ran this car maybe one hour total since overhaul by reputable mopar shop, which is now out of business after many years. I am wondering if my oil pressure switch didn't go bad. We pulled the wire and grounded it, and turn on the key and the light went out, so I believe the wiring is ok. We heard no noises and before the light was flickering had run the car probably 15 minutes, with no noises. Is there a chance my oil pump is plugged or something? Should I throw a switch on it and see if it stays out, or go right to a oil pressure test? If I go to the test, what should the pressure gauge show? Any suggestions?

 

[bm02tj]

first step is check with a mech gauge and depends on pump installed 40 to 60 psi cold
could be stuck relief on pump lifter popped out loose oil pick up or a cracked pickup
but after sitting that long stuck relief might be the easyest

good luck

 

[moparmusclecars]

After i check with a gauge, How can i check the relief valve? Do i just get a melling pump and change it out? How much priming the engine with oil is needed, and how? Thanks!

 

[moparmusclecars]

Pressure gauge showed 50 psi on cold start, so I am good to go. Replaced oil sending unit switch, and the light went out. Thanks for the advice.

 

[HT413]

Pressure gauge showed 50 psi on cold start, so I am good to go. Replaced oil sending unit switch, and the light went out. Thanks for the advice.

Wow, not always gonna be so lucky. Congrats on the easy fix!

 

[moparmusclecars]

yeah, This engine has no road miles yet, so I was a little worried, but everything checked out ok.