water pump and the timing chain replacement?

Hello,

The timing chain is not a maintenance item like the timing belt. It does not have any recommended replacement intervals.
However just like any mechanical components it can wear off, get loose or break. Timing chain should be inspected for excess play or any sign of wear and replace as necessary.
The water pump should be replaced if there is an issue like a leak or overheating due to bad water pump.
Many times the chain and the water pump does get replaced together just to save time.

https://www.2carpros.com/articles/water-pump-replacement

I have included the complete replacement procedure for the timing chain and the water pump.

Please let me know of any questions.
Thank you.