Hello folks, newbie here to the forum. I work as an independent mechanic and I have an '07 Hino 268 with an Allison trans that keeps leaking at the cooler line connection at the radiator. I have replaced the o-rings on both lines several times but the start leaking again after a couple months. Does anyone have the correct size and material information on these o-rings? My local International/Hino dealer is my closest source of Hino parts and they say there is no listing for the o-ring that goes inside the fitting on the radiator. I have tried buna and viton though the viton was questionable as I'm used to them being tan. Any help would be greatly appreciated.
