I have designed tools to enable changing the 987.1 era IMSB with the engine in the car. I began working on it when Boiler Inspector's IMSB failed n I had to split the engine cases to change a $30-/+ part. I bought my first CS hoping the IMSB was bad, but no it was a rod brg. I modified it out of the car n bought a second 2006CS to prove the process was doable insitu. It's old world hand craftsmanship n my results are equal to the factory in quality of bore finish. The tool is designed to capture the chips which are cleaned as the hole is being enlarged. I pulled the sump off after flushing and blowing out the area and found no chip in the sump. My "in car trial engine" has only 28,000 miles and of course the bearing was like new but I wanted to ensure I could do it in the car. Some pics are attached.
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