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If the forward seals do not leak, do NOT replace them. Removing the VVT is an extremely hard task and not taken lightly. The rear seals can be replaced, but they can also be replaced at a later time quite easily with the cams inplace.
No, the front seals can not be replaced without removing the VVT or the sprockets. A heavy duty cam locking tool, as shown by Packard8 is needed to remove and install the VVT and is done by holding the back ends of the cams in place.
Once the cam cover is off, the cams can be lifted off and kept in a clean place.
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My back feels better when I sit in a Volvo seat
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