[March 2015 Update]

Since this article was originally published in 2010, there have been some useful updates to the IMS Bearing Removal and Installation Kit that facilitate an easier and safer installation of the bearing. When I originally wrote this article, the only method available to lock the camshafts was to use the original Porsche factory tools, which costs several hundred dollars at the time. Since then, the camshaft locking tools have been added to the bearing extractor / installation kit. The use of these tools reduces the need for the "set screw method". To use the tools and lock the camshafts, begin by simply setting the engine to Top Dead Center (Figure 132). Then remove the camshaft end covers on both sides (Figure 133). Install the camshaft locking tools (factory tool is shown in Figure 137, the aftermarket tool varies slightly in appearance). With the engine crankshaft locked at TDC, and the camshafts locked with respect to the crankshaft, this should reduce the chance of disturbing the engine timing almost down to zero. NOTE: the IMS shaft will still tend to move off-center when you remove the bearing cover due to the pull of the chains/tensioners, so if you can install one or more of the set screws to hold it in place, it would still be a wise idea.

Please ask any additional questions at the bottom of this article in the comments section.