Which engine does your 1985 Chevy Celebrity have? The two engines are very different.
Which engine does your 1982 Chevy Celebrity have? Is it the 2.5L 4 cylinder or the 2.8L V6? They are very different.
Chevy didn't make a 1981 Celebrity
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.
No Chevy Celebrity ever had a 4.0L engine
To answer your question I need to know the year model of your Chevy Celebrity as well as the engine that it has in it.1996 chevy calavlier 2.2
To see a diagram of your engine look in a repair manual such as Haynes, Chilton or the factory service manuals. They have illustrations of the engines.
You need to be more specific. What year is your Chevy Celebrity and is it on the front or rear of the car?
Does your 1986 Chevy Celebrity have the 2.5L 4 cylinder engine or the 2.8L V6?
The timing on y our 1987 Chevy Celebrity is controlled by the engine computer, there is no way provided to adjust it.