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Gotta get an exact diagnosis first. If you spun a bearing on a rod or crank, you may just need a lower overhaul. If there are a lot of miles on the engine then get a complete rebuild. An inspection of your engine will determine what damage has been done internally. Until that is known there is no way to estimate the costs you will face.
Inside the oil pan. Not an easy job. Just a note... Probably not the pump. Probably is the main and rod bearings on the crankshaft. Pull the engine. If really high miles rebuild the engine or replace it. If low miles (like 100,000), replace the crank and bearings. Unless a bearing has spun. You would know because there would be a constant knocking in the engine lower end.
which engine? size?
the ECU nor any lamp can save the engine with no oil or too low
or never changed out.
you missed, week level checks.
and if levels drop fast (as it will driving real fast)
you check more often, in fact you learn what your engine needs.
my guess is loss of oil pressure,
the idiot lamp( just name) comes on with its TOO LATE..
on most cars made.
get a real gauge called oil pressure.
or the engine overheated
or just bad luck.
what seized, cam , crank or rod bearings.
the machinist will tell you for sure what failed.
the pump or low levels.
push rod engines. the rear rod bearings like to fail first (low oil)
then on overhead cams, they bite dust first. (top end oiling can fail easy)
also, on the last rebuild did (no 2 before) the PO, ran water for antifreeze this cause the internal freeze plugs to pop and
water in oil and rear rod spun(seized)
water makes really poor oil substitute.
when you take it down there are tons of clues.
oil looks like chocolate milk shack
bearings spun ,cam bearings gone.
cracks in block and head.
ever inch checked then pressure tested before rebuild.
You are up for an engine rebuild. Remove the engine and turn up side down in a stand. Remove the sump and find the failed bearing by taking off the big end caps. If you find a con rod damaged you will have to remove the head and that piston and replace the con rod. If it is a main bearing that has spun you should only have to replace the crank shaft and fit new bearing shells Either way you will need another crank shaft. Check the price of a low mileage engine from a wrecker as it will be quicker and possible cheaper in the long run
if the bearings or even one bearing has spun, the lower end of the motor needs new bearings and the crankshaft must be "turned" or resurfaced.. this requires pulling the engine... if you drive this vehicle in this condition, you will have catastropihic engine failure which would totally destroy the motor probably.. If you or someone has the expertise to remove the motor, putting in a "crank kit" is not difficult for anyone with a little mechanic experience.. but, basically, this is time to rebuild the motor whether you just do the crank kit or go ahead and go all the way with it since you already have it out and opened up...
There is no cure for that other than taking out the engine and tearing it down and replacing the rod bearings. There is probably too much clearance between the bearings and the crank journals do to worn bearings.
It would not Hurt to Change the Oil Pump But, You Probably do not need to. Use Valvoline Full Synthetic 10-40. If you have no other Problems with it right now Do not Change anything, Just do the Crank kit and it will be Fine.
it sounds like you know what you are talking about so you probably already had a look inside the brake drum for worn shoes and broken springs ect.........If you haven't do so.As for the bearing.....there is one but it requires dis assembly of the reared.if you haven't done one of these,get someone who knows how to..there are too many little things to know and its easy to damage the diff from improper dis and re assembly(then you're lookin at big bucks) If you feel confident you can do this though get a step by step manual to ensure you know all of the procedures hope this helps.........Good Luck!