- The REAR Cam Seal: I used Corteco and the O.D. is perfect, it requires some force
(appropriate socket) + small hammer to drive it in. It is a nice amount of force to push it in.
- The FRONT Cam Seal: I also used the Corteco, but the O.D. could be a bit bigger.
You can push it in by hand, no need for socket or hammer. This is why some of these seals fall out with time.
The design is very poor. The VVT Hub Shaft is not long enough, the sealing edge is about 1.5 mm
from the bevel edge...
The problem is two-fold:
1. From factory, the metal bore is around 65 mm, plus/minus a bit bc machining new bore
is only that accurate, there is always some difference from engine to engine at the factory.
2. From the seal mfg standpoint, there is also variation when new seal comes out.
Anyway, as @abscate said when doing FRONT cam seal, a thin coat of black silicone RTV should
be used on the OUTER edge. The INNER lip should be oiled during installation.
A photo on seal education. This is why car mfg's work very hard to make sure the seal (whoever the mfg is)
works fine for 100K miles to avoid recall etc.
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