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I will donate, since I also had an M117 engine. It is necessary to replace the chain, the chain tensioner, and the plastic chain guides. Replacing the plastic chain guides is crucial, since their deterioration leads to breakage, causing the chain to skip and resulting in the valves colliding with the pistons. Unpleasant. The chain tensioner must be of a reputable brand. I acquired a FEBI, and it has been leaking oil from the rear. Consider purchasing two units, exploring other brands, or acquiring the original MB component. Ultimately, this is insufficient; the synchronisation between the cams must be verified, and if it is incorrect, the appropriate Woodruff key must be acquired. Here is some information. If your technician is competent, he or she will see that this is a crucial step. We completed the whole surgery with my engine. Subsequent K-Jetronic tweaking enabled the 5.0L engine in the 500SEC to achieve around 232 horsepower, consistent with the specifications for my vehicle.