What specific parts should be inspected on a car that burns oil?
This can get lengthy- Before you have the engine disassembled, it would be wise to have a diagnostic run test done to help determine cylinder balance, gnition balance, etc. A compression test will also provide more information on each cylinder. If the compression is low, a little oil squirted into each cylinder, one at a time, will point to worn rings if the compression increases when retested after the oil is added. Sometimes the compression rings are not worn as much as the oil rings, so the sompression test can be misleading. If the compression is up and it is still burning oil, and if the engine oil level is not dropping much over time but the transmission fluid level is magically disappearing while leaving no drips or puddles, then check the vacuum modulator line from the transmission to make sure the vacuum modulator is not leaking transmission fluid into the engine intake. This will cause the engine to smoke also. Also, on many engine, if the compression is up, the valve stem seals may be the problem. They can also be checked on most engines if done carefully by pressurizing each cylinder with air, one at a time, and removing the valve springs to get to the seals. The valve guide clearance can be roughly checked during this process also before removing the springs. This can be done without pulling the cylinder heads. If the engine is being disassembled completely, ck. the valve stems, (the valves will probably need to be ground to spec.) ck. valve guides, (valve stem seals will be replaced); (piston rings will be replaced); cylinder walls must be checked, (excess wear and taper), speced out to see if they will need to be bored out which will require new oversized pistons; if in spec, ridge removed from the top, honed top to bottom; heads checked to be not warped or cracked; with new rings, new rod inserts should be installed, crankshaft spec'd out and sized as needed; if the engine is high mileage and 'loose', the main bearing inserts should also be replaced as well as the oil pump; the camshaft should be checked and the cam bearings replaced; all freeze plugs should be checked for corrosion and potential failure; cam chain and gears (or belt) will be replaced; all seals and gaskets will be replaced as well as the oil filter. I hope I didn't miss anything! Good luck!
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