Put the motor at TDC not 15ATDC. (It is in the manual and I have done it) Remove bearing caps 1, 5 and 6. Then slacken both bolts on bearing caps 2, 3, 4 and 7 one turn at a time in sequence until the counterpressure is reduced. Then you can lift the camshaft upwards. It is a very tight fit so be sure to reinstall with the TDC marker lined up exactly with the line on cap 1.

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Tom Hughes
St. Louis
84 300SD
92 300D
86 300SDL