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HelloCustomer If your sunbird is a 2.0 liter, then the timing belt has to be removed to change the water pump. The water pump actually acts as the timing belt tensioner on this car. The labor guide calls for 3.2 hours, and this is for a fully equipped shop with experienced mechanics.
Although it is possible to replace this water pump at home, it is a fairly complex job and would probably be best to have someone do it who is comfortable dealing with the timing belt.