According to the service manuals the recommended service interval for the Timing Belt is 90,000 OR 7 years whichever occurs first. so in either case you should seriously consider it needed.
Since the Water pump is driven from the same belt, changing the Water pump is simply a way to avoid having to go through the process again should your water pump fail 2 months after the timing belt has been done.
The added expense of the pump should not add that much to the total bill as most of the charge is for labor not parts.
If your belt fails you will experience a much larger expense as you have a better than average chance your engine, (or parts of it anyway) will self destruct.
Try to stick with a Honda Dealer or at least a service facility that specializes in Honda's so you get properly trained people working on your van.I have a Honda Odyssey 1999 with 80000.When I should replace the timing belt?Do I need to change water pump?Honda recommends replace at 90k. ALWAYS change the water pump when u change t-belt. use Honda or gates belt only. also, now is the time to change many things. here is the list: timing belts( there are 2 on 4 Cly.), timing belt tensioners, water pump, cam seals, crank seals, adjust valves, valve cover gasket, thermostat and gasket after flushing cooling system, spark plugs, distributor o-ring(if equipped) and drive belts. service tranny and flush power steering fluid. its a lot to do but my sisters Honda is over 400k miles and still runs like a champ. preventative maintenance!!I have a Honda Odyssey 1999 with 80000.When I should replace the timing belt?Do I need to change water pump?Don't know that exact vehicle but rule of thumb is that if you have to remove the water pump to change the belt or chain then replace the pump. You have done all the work so why stick an old one back on. But at 80,000 miles I would change it for sure.
