This depends on a few things, what year your 4Runner is and which engine is in it, as well as the labor rate at the shop you decide to bring it to. I looked it up on a V6 engine. If you have a different engine the numbers may go up or down a bit.
According to the Labor Guide this job should take about 4.4 hours, so multiply that by their shop rate and add parts and taxes.
As for parts there is a range of what may or may not be needed and the technician won*t know until they get into your engine. On the high side - using dealer parts and assuming they need to replace not only the water pump, belt and seals - but also the timing belt tensioner and pulleys and accessory belts... parts can be as high as $675.
If a shop has a labor rate of $100/hour this brings you to about $1115 plus tax. This should be a *very* high side quote, assuming they replace all seals, all pulleys, tensioner and all belts in addition to the timing belt and water pump.
Hope that helps!
〉 Answered on Feb 11th, 2009 by Bogi Lateiner, Owner and Technician at 180 Degrees Automotive
Take a look at this site. It does a pretty good job of giving you prices in the area you live for repairs.
〉 Answered on Feb 11th, 2009 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines