timing chain replacement instructions

This vehicle has a timing chain and does not require replacement unless there is an issue requiring it.

I attached the info below on how to replace the timing chain if that is needed by you or others that visit this page.

Let us know if you need other info. Thanks

My Buick has 85,000 miles on it and I heard that I should have the timing chain and gears changed before the gear disinagrates and causes bent valves. I this true to any degree?

You have a steel chain and gears, leave it alone till it needs it, may get 200,00 miles out of it.

how loose is a new chain suppose to be after installed?

Okay, I attached the procedure for removing the timing cover and setting up the gears for the timing chain.

https://www.2carpros.com/articles/how-a-timing-belt-works

Roy

Removal Procedure
1. Remove the torque axis mount.


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2. Remove the torque axis mount bracket.
3. Remove the drive belt.
4. For Engine Code 1, remove the drive belt idler pulley. Remove the pulley bracket.
5. Remove the drive belt tensioner assembly.
6. Remove the crankshaft balancer.


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7. Remove the sensor shield.
8. Remove the crankshaft sensor.
9. Remove the oil pan to the front cover bolts.
10. Remove the engine front cover attaching bolts.


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11. Remove the engine front cover.
12. Inspect the timing chain for overall in and out movement. Movement should not exceed 25 mm (1 inch).
13. Inspect the sprockets for wear.
14. Clean the gasket mating surfaces at the timing chain cover, and cylinder block.
15. If the oil pan gasket is excessively swollen, the oil pan must be removed and the gasket replaced.

She starts cold on 3000 rpm but when I disconnect and connect again the throttle position sensor wire – she goes down to normal.
NOW NEW AND BIGGER PROBLEM: I didn’t move the car yet but there is a new terrible noise from the left side of the engine (where all the pullies are) and it sound to me like a timing chain…she come and goes and at certain RPM the engine is smooth as butter but on a low RPM she is making terrible noise. I thought it is one of the pullies but I listen to them with a long screwdriver – handle on my ear and tip on the pully and they sound good. My mechanic said that there is no such a thing as just replacing a timing chain – the engine is gone. Please advise.

With the age and mileage, a timing chain and tensioner are not an uncommon fix.
At certain RPM, there is a tensioner that keeps the chain tight at all times, (and these fail over time), and probably it gets looser at lower RPMs.
Replace the gear, chain, sprocket and tensioner to fix it if you are keeping the car long haul, otherwise speak with your mechanic about ,"in between" repairs. Definitely get another timing chain tensioner though.