There is at least one special tool for installing the cam seal...I would let a pro do this... You also need the Mercedes Special Sealer for this. It is formulated to allow for large amounts of metal to metal float and still seal.

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Benzmac:
Donnie Drummonds
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM