as a first test step, in logical step by step engine forensics
ID pull all the spark plugs and make certain the battery is fully charged, and read the dip stick, is it full and does the oil look black, or is it over full and oil looks like a cup of coffee with cream, is there rust on the dip stick???
, if none of the spark plugs are obviously sitting in a cylinder full of coolant from a cracked head or leaking head gasket..
.ID start the forensics by putting a squirt about 4 to 6 table spoons of 50%/50% diesel fuel and marvel mystery oil in each spark plug hole and let it sit over night, this lube fluid bath will loosen rust and aluminum corrosion on the engine bore to piston surfaces, then, without replacing the spark plugs , and after a full 12-15 hours, ID hit the starter, yes if it kicks / spins over ,there will be a mess of sprayed oil, (having a few old beach towels over the spark plug holes helps reduce the potential mess)and yes it will be very noisy, but it will show the crank/piston assembly's free to spin, if it does not, pull the valve covers and take and post pictures, and drain the oil , then pour the old oil through a section of window screening, to catch any sludge or metallic bearing fragments, and take pictures,
we may learn a few things from the pictures
if it does spin easily and there's just old black oil,
in the oil pan, try to measure the volume that drains, then, replace the oil and oil filter and do a compression test yeah, the possibility exists that the engine has a spun connecting rod bearing or main bearing, or bent rod or defective valve train, components, a logical process can find the cause!
there's nothing all that difficult to do, it will require some basic mechanical tools and skills and getting your hands dirty, but you also have the potential to learn many new skills, and yeah,
obviously having a buddy with previous experience and a few tools helps a great deal
read the links and sub links
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