Before it breaks
Four cylinder has a chain. Replace it when it breaks or has so much slack in it that it jumps timing. Replace the guides at the same time. They have wear limits.
Toyota recommends every 90K.
with a wrench or socket
It has a timing belt. I was told to replace mine at 90,000 miles, so I did.
The 2.4 liter four cylinder engine in a 2009 Toyota Camry has a timing CHAIN
If it had a timing belt, you would replace it at 90,000 miles. But this engine has a timing chain and does not have a belt.
The 2.4 liter four cylinder engine in a 2004 Toyota Camry has a timing CHAIN so there is no timing belt to change as a maintenance item
You have do it each 80K miles.
no The Chevy Celebrity 4 cylinder engine doesn't use a timing belt, it uses a timing gear. To replace the gear it is necessary to remove the camshaft from the engine as it is a press job. To remove the camshaft it is necessary to remove the engine from the car.
you do not need to remove head or differential.i never have