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It is a timing chain, and no, you can replace it in the car.
no
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.
First off, you do not have to remove the engine from any vehicle I know of to replace a timing belt. Secondly, your vehicle has a chain, and not a belt.
No. Timing belt replacement is possible in vehicle.
Begin by removing all of the pulleys from the front of the engine. Remove the front engine cover. Remove the timing belt. Reverse the process to install the new timing belt.
To replace timing chain on a 3.1 Chevy Lumina engine, you need to first make sure that your motor or engine is turned off. Then you need to remove the chain and replace it.
You take engine out. Remove the flywheel/flexplate and put the engine on an engine stand. Remove the oil pan, timing cover, and timing chain. Remove all rod and main bearing caps. Remove the crankshaft. NOTE: You would be much better off buying a new or used engine than attempting to replace a crankshaft.
No, You do not need to remove the oil pan to replace the timing chain. I don't know why you think the timing chain needs replaced. But I would make Darn sure that it does before you tear it down and do all that work for nothing. The timing chains on todays engine normally will out last the engine.
support the engine on a floor jack, remove the motor mount on the right side, clear access to and remove the timing cover, remove the timing belt. Water pump is under the timing belt. Replace the water pump and reassemble. It is strongly reccommended that you install a new timing belt.
Put the car on a lift, drop the motor/transaxle out of the car on an engine stand and break down the engine. You will need to separate the engine from the transaxle at this point.
No, this engine has a timing belt.