The rear cam seal I replaced 500 miles ago started leaking. I found the rubber lip that contacts the cam had become distorted, and oil was leaking there. It was not distorted when I installed it. I'm reasonably confident I didn't err on the install; I used lots of ****, the cam is not scratched, and it was firmly seated using a PVC coupling. I am suspicious of the Felpro TCS45870 cam seal kit I used, which has National K32138R seals in it. I ordered the Ford seal, E9DZ-6700-A, to replace the failed one. It is made in Japan, markings: NOK, PN BH2737E. To my eye, the NOK seal is superior in construction to the National seal. The seal I originally replaced was a NOK seal, and it had gone over 120K miles with only the slightest seepage. I wonder if the National seal is a true metric seal, or a close enough approximation by National? I put the Ford seal in without sealer because there was no evidence that there had ever been any used, and I noticed the seal went in very easily, maybe too easily. Maybe these things can shift position once the head warms up and the AL expands? Anyway, I thought better of it and pulled that brand new Ford seal out and then put in my spare using RTV around the perimeter like the FSM calls for.
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