Drain the engine oil.
Remove the oil pan.
Remove the oil strainer.
Disconnect the negative battery cable
Remove the oil pump chain guide.
Remove the oil pump chain tensioner.
Remove the oil pump chain tensioner spring.
Remove the oil pump chain.
Remove the oil pump sprocket
Remove the oil pump.
Install in the reverse order of removal.
Check the engine oil level.
Start the engine and check for oil leaks.
If there is a leak, identify the defective part and repair or replace it.
Check the oil pressure. Oil pressure check for Mazda 3.
