Was driving in town the other day check engine light came on and oil pressure dropped to "L" i pulled over and checked under the car it was wet all over the chassis driver side.


Started it back up cut the music off and creeped to oriely brought a quart of oil... Slid back under the truck before top off the oil. Found a small piece of seal had blown out.

About a $950 fix.

Meanwhile i dont want to pull the motor is there any suatable rtvs that i can use on the pan edges for temporarily fix?

The check engine light is off after refilling but no oil pressure is sensed

 

Oil pan doesn't have any pressure inside, so there are no "seals" to blow
Its like the valve covers, no pressure, and uses gaskets to prevent gravity leaks

So yes, any RTV could seal a gasket leak, problem is getting it to stick inside a gap with oily surfaces, so not a high probability of long term success
Front and rear of oil pans have rubber gaskets around the half circle to seal crank shaft pass thrus but no pressure on these except gravity on any oil that comes in contact with these gaskets

There are also front and rear Main Bearing Seals, not part of oil pan gaskets, these do have pressure, alot, so if these leak, oil would pour out of a running engine, rear main seal is the more common failure, oil would come out(pour out) of bell housing
It wouldn't effect oil pressure until all oil was pumped out

Oil pan gasket leak couldn't effect oil pressure, the oil pan is deep enough to hold enough oil even with a gasket leak, the "Check Oil Level" light may come on but oil pressure should not be effected, the oil pump pickup is at the very bottom of the oil pan

Check Engine Light(CEL) is something different, if its on then its not an oil pressure issue, this is a computer activated light, and computer doesn't have an oil pressure sensor connected in 1990

Oil Filter and oil filter housing can "blow a seal" these have pressure, and it would cause no oil pressure on the dash gauge

If you have no oil pressure the Valve Train will start to "tick", can't miss that noise, gets very loud, do not run engine if you start to hear that noise.

Just a heads up on the oil pressure gauge, around 1987/8 Ford changed the gauge on all it's vehicles to an on/off setup, and changed the oil pressure sender on the engine to a Switch, under 5psi OFF, over 5psi ON
So if the gauge shows LOW then pressure is under 5psi, or Switch has failed, valve train will start to make noise with oil pressure under 4psi