How to Troubleshoot an Old Car Engine That Does Not Turn Over
- 1). Remove the oil drain plug with a socket wrench and drain the oil into an oil pan. Inspect the oil and see if water is present. If a lot of water is present, the engine is likely seized and extensive rust damage is present inside the cylinders and on the crankshaft. Rust damage can be so extensive the engine is ruined.
- 2). Remove all the spark plugs and inspect each one as it is removed. Look for rust development on the plugs. Discoloration or oxidation are signs of problems and the piston rings may be rusted against the cylinder walls. Spray aerosol lubricant in each cylinder and let it set.
- 3). Jack up the front of the car and lower it onto jack stands. Use a socket and ratchet to remove the oil pan bolts. Drop the oil pan down enough to shine a flashlight into the bottom of the engine. Look for obvious signs of problems such as broken connecting rods or shattered pistons. Also look for severe rust.
- 4). Insert a socket onto the front crankshaft bolt and try to turn the engine. Work the socket back and forth in an effort to move the stuck engine parts. If the engine eventually breaks free, then only the piston rings were stuck. If it fails to move, the engine will need to be disassembled and inspected for damage.