How many miles do you have on the car, and why are you replacing the timing chain?
While timing chains are designed to last the life of the engine, and there’s no routine change schedule, occasionally a timing chain and/or its components (usually the tensioner, which in a chain will be a channeled piece with a nylon insert that the chain rides on), will wear out and start making a rattling noise that sounds much like bad lifters. I had to change one at about 200,000 miles on one of my vehicles.
In truth, I suspect that db is right, I suspect that you may have misunderstood. The timing chain only drives the camshafts. There is a rubber belt called a fanbelt, serpentine belt, sometimes a V-belt, and often a drivebelt, that drives the water pump, the alternator, the AC compressor, and the power steering pump (if you have one). Sometimes there’ll even be more than one.
In an engine that drives the camshafts with a rubber belt called a timing belt, the belt also usually drives the water pump, and failure of a water pump can destroy a timing belt, so replacement of the water pump is often recommended when the timing belt is done as a preemptive action. It prevents having to do the expensive job all over again because the water pump failed. But in an engine that uses a chain, like yours, a water pump failure will not affect the valve timing parts, so no other damage will be done; the water pump would just need to be changed, so it’s considered a totally different and unrelated job.
I hope this helps.
By the way, there are technical differences that could be elaborated on regarding V-belts, serpentine belts, and fanbelts, but I thought that level of detail was unnecessary to understand the main question, so I chose not to go into that level of detail. Besides, a lot of guys use the terms interchangeably anyway.