Thanks for all the help guys. I saw those 4 bolts but thought they held on the pulley. I had no problem getting them off with a 10mm box wrench and a 3/4" foot long pipe. Even without turning the engine.

Bill

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'87 300SDL, intensely modified Greasecar setup, with nickle plated heat exchanger, 3 valve setup, 312,000 miles
'95 Suburban diesel, Greasecar basics, 16 plate heat exchanger, mercedes fuel lines, Racor filter
'85 Renault Alliance converted full electric vehicle