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No. Crank and main bearings can be get at by dropping the oil pan, but to get to the small end rod bearings you've got to get the pistons out.
If you can get the oil pan off, you can get replace the bearings. Basically, remove the pan and start removing the rod caps (one at a time!!!) once you get it off, you can replace the lower bearing half easy enough. to replace the upper, you will need to slowly rotate the crankshaft at the pulley bolt.as it spins with the cap off, the upper bearing will become loose allowing you to remove it and install new. There is a lot more to it than just replacing the bearings. There is a good chance the rods will be out of round. If they are, you WILL end up spinning one of your new bearings.
Just remove the oil pan and repair or replace it.
Lack of oil or incorrect oil. A tired oil pump A plugged up oil sump screen. Worn out bearings (cam, mains and rods) An incorrect reading from the oil sending unit or gauge.
....At the very least, replace the crankshaft and bearings (rods and mains) At the most, rebuild the entire engine. It won't crank because when you drove it with out oil, the bearings on the rods, (most likely) or the main bearings got so hot, they melted or "tack welded" themselves to the crankshaft. When you turned off the engine, the weld completed its self thus preventing free rotation of the crank. I probably shouldn't have to tell you that continuing to drive with out oil damaged the engine. You already figured that one out! And, unfortunately, it will cost you a truck load to fix it.
Replace or rebuild the engine. In all but the most obscure cases, low oil pressure is caused by worn bearings. Replacing the oil pump won't help.
Hi Yes I'm afraid it does. The oil pump is usually in the sump, oil is pumped up to the top of the engine and lubricates the valve rods the piston rings and the big end bearings.
If you are talking about the crankshaft rod bearings, you can just remove the oil pan, and replace each crank bearing one at a time without actually removing the pistons. But to replace the piston pin rod bearings the pistons will have to be removed. IMO, if any of these bearings are worn bad enough to need replacing, then the engine needs a complete overhaul.
The easiest way is to disconnect the motor from the mounts, and the transmission from it's mounts.use an engine hoist to lift the motor up about 4 inches and drop the oil pan. You will have to pull out the crank which means the bottom of the rods as well try not to move the pistons, you will have to replace not only the main seals, I would do both, but the oil pan gasket and the rod bearings.
Test volts to the pump. Shake wires and test again.Maybe a bad connection.
Clean out the Throttle Body, Clean and or Replace the air intake filter, Change oil to a synthetic motor oil, Change the Main Bearings camshaft bearings. Install After Market Parts. Replace all Seals and Gaskets in the motor. Remove unnecessary weight.