I have a difficult problem with a ford 460 in a rv converted shuttle
bus. After running dry on oil(dont know why that happened) the oil
pressure is 0 i confirmed that it really has no op. the engine is not
locked up and starts but with no op i dont dare run it. if the oil pump
is really dead its a real bear to get it out of the engine in this
vehicle. this sounds real rube goldberg but is it possible to pump oil
into another place in the engine like where the oil pressure sending
unit is and have it circulate to the critical places? i cant find any
place that shows the oil circulation path in the engine. I could get an
electric pump hook the suction side to the oil pan drain and the
discharge to some other place in the engine?
if anyone knows where i can find a drawing showing the oil circulation
path in this engine please post it.
I love this kind of thinking Mike because it feels so good when you can
create something that works, saves money, and beats the established
norm for service. What you propose might be done. You would need to
plum suction and return from the oil pan. Pressure to the mains might
not be adequate. We'll see what others say on this.
But really, it would cost more and do more damage than it's worth.
Since you ran the engine dry of oil in the first place and don't know
why, you need to start there. Maybe the engine had no pressure because
the main bearings were worn, although those oil pumps do go bad. They
don't make the engine go dry thourgh. I think you should concentrate on
the easiest way to remove the pan so you can check the engine out and
get lucky replacing the pump.
The crankshaft is hollow, and the internal oil pump sends oil thru the
crankshaft center to holes in the crankshaft, all located at junctions of the
crank/connecting rods. Indicated oil pressure is a reading of the back pressure
on the oil pump caused by the oil being forced thru the holes with the
connecting rod bearings covering them. Oil pressure can vary, based on condition
of oil pump, oil filter, pickup screen (dirty/clean), connecting rod bearing or
crankshaft journal wear, engine rpm, or oil viscosity; as the oil heats, the
viscosity drops. See reference below. In any event, it sounds as if what you
have is a "spun bearing", allowing the oil to pass the crank/bearing interface
with virtually zero resistance. If you want to save the engine, it's time to
drop the pan.
A spun bearing is likely; may even be the front cam bearing that feeds oil
to the galley that the oil pressure is read from.
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