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when in doubt, read the book
Having the service manual helps some times, as I've long forgotten the details, not having done this myself for like 20 years.
The M110 service manual starts the procedure with a note... Camshafts can be removed from an installed engine only together with the camshaft housing.
The second note says that if a new camshaft has to be installed, the rocker arms must also be replaced.
Lastly, there's a note regarding replacement camshafts being available with wider journals so finding a used cam shaft may be easy, but double check the journal sizes to ensure its going to fit correctly in your cam housing.
Having said all that, I recall there being early and late versions of the housing and that early versions had a habit of starving cams of oil. Given the relative age of these cars, it would be interesting to decide which ones are originals and which have been replaced.
Once you have the cam housing off the motor, you'll need to have it checked for warping and possibly milled flat as you would a cylinder head.
Removal is pretty simple says the book...
1. Remove the camshaft housing (see procedure 01-470).
2. Unscrew both rear covers.
3. Unscrew necked-down screw of lefthand camshaft while applying counter hold pressure with holding wrench (soft-metal wrench that can hold the cam w/o marring it surface).
4. Press back the camshafts and remove the sprockets.
5. Remove both camshafts toward the rear.
Watch that first step...
-CTH
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