no need to change the belt tensioner or water pump when you have the belts changed,the tensioners are all metal construction,no cheap,nasty plastic rollers here !!!. The balancer shaft is as the name implies,it balances out the inherent vibration you would normally get with a 4 cylinder engine to make it feel smoother.
About the coolant capacity 4.2 ltrs is about all they hold,not a huge amount i know but it must be up to the job i guess or you would see loads of accords overheating everywhere & blowing head gaskets, just make sure that if you decide to change the coolant yourself make sure you throughly bleed the cooling system to purge it of air !!
if it aint broke don`t fix it
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