Good morning - I'd like to replace the belt on my Westerbeke 4.5 KW generator as it looks worn and as well has gotten some oil on it as a result of a leaky seal on the oil filter. Can you advise me as to where the tensioner (if there is one) is located? And if not, how best to remove the old belt. Also, can this belt be replaced with one purchased at an auto parts store or must it be OEM? Thank you in advance.