I just resealed the gearbox on a 1981 SC. I've done this several times over the years on various other 911's without ever having any issues. But... on this one, I replaced the two output shaft flange seals with elring part number 999-113-183-40-M30 45x68x10. I was stunned to discover a profuse leak on the PS and a minor leak on the DS after a 5 mile test drive. I removed the PS seal and replaced with another brand new elring seal.
After a 3 mile run, it's leaking again. The PS is set exactly straight and 2mm recessed below the case cast and the DS is at 3mm. I tested the seal point where it rides on the flange after replacing the seal for the second time and is sits exactly on the shoulder where the original seal left its mark. Like I said, I've never had an issue with these leaking in the past. Is there more than one size option? Ever heard of elring having an issue with this? I've always used these seals and never had issues.
Thanks for your input!
