Hugh McKinney
Member
Okay, I've been scratching my head over why this o-ring number B 293 R doesn't want to fit my ventilator pump cover. It seems that my cover has the part number F 3414 R, while the parts listing for my 70 shows the cover part number to be A 4188 R, and it comes with a large groove machined into it for the B 293 R o-ring. My F 3414 R does not have this machined groove. My 70 has a serial number of over 32000; mightn't it be a transitional engine? Anyway, if anybody has a similar ventilator pump cover, I would appreciate any suggestions as to how this thing seals against the fan shaft tube. Thanks again, Hugh