Look at the pictures here: http://www.continentalimports.com/ser_ic100345.html

The pin shown in the front of the head has not been removed to get that far. It is necessary to remove it to remove the head (which is the only real way to fix your leak), but not to get the cover off. It does make the installation kind of a pain.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician