2001 Dodge Dakota 4.7l v8 low oil pressure problem

Asked by Sep 22, 2019 at 04:11 PM about the 2001 Dodge Dakota Sport Quad Cab 4WD

Question type: Maintenance & Repair

Bought the truck last year, the kid I bought it from racked the
truck to hell. Spun a bearing on the crank shaft, 8th piston was
slapping the head which lead to a cracked head. Replaced
crank shaft, all bearing for the crankshaft and connector rods.
Replaced both heads, oil pump, and water pump. Rear end was
swapped for a low mileage rear end. Transmission was
repaired(not rebuilt). This truck really just needs a scrapped
because of the extent of damage done to it. But I'm in no
position to toss it out yet until I find a replacement daily driver.
My problem now is with the oil pressure! The truck has normal
oil levels of a recommended 5.5l. there's a dispute on oil levels
to begin with seeing how when you fill with
5.5(recommended)Liters the dipstick then reads high. As far
as I have learned it's a manufacturer faulty having a poor
reading dipstick. Anywho, the truck upon start up(cold start)
runs at about 3/4 oil pressure on Gage. As my motor warms
up its falls to 1/4 low bar indicator and stays that way while!
Now after long durations of travel(typically 30+ miles of
65mph) when I come to a light my oil pressure drops
completely! If I give it a little throttle it picks back up to
1/4(low oil pressure quarter mark bar) where it has always
idled and maintained during driving. I've been told by many
people the truck shouldn't be idling at the lower end bar let
alone maintaining that same pressure throughout driving. I
replaced the oil pump when repairing the motor so I don't
understand what's the problem? Very frustrating!

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