Have a 2007 G35 sedan Journey. 180,000 miles
It's had a slow coolant leak for the past year and I would add coolant periodically, but it's become worse. I could see what looked like some seepage on the frontal portion of the engine, but no signs elsewhere. Local mechanic pressure tested and said radiator, rad hoses, heater hoses needed to be replaced for $1800. That didn't help it at all so I took it back. They now say it's the water pump and want to replace timing chain as well for a price of $3800.

Is it required to replace the timing chain when the water pump is replaced or is it just a good idea to do this while work is being performed on the water pump? The timing chain makes this a much more expensive repair. I don't drive the car much and may just sell the car if I can get it so it doesn't leak coolant.

This is in Southern California (Orange County) and labor for the entire job would be 2400 and timing chain kit is $1100

 

Timing chain should be good for 250,000 miles. It's not necessary, and the water pump can be "easily" replaced by just partial removal of the tensioner.

Lots of cars it's worth doing both, but I wouldnt' worry about it.

Also, water pump going out shouldn't be a cause for a leak, according to my research as I was eliminating things before it came down to headgasket in my car recently.