For vehicles with air conditioning, remove the battery and compressor.
Unscrew the plug with a 17 mm wrench. It is located in front on the right in front of the exhaust manifold.
Before loosening the threaded pin, unscrew the oil jet by about 2 turns using an Allen key. Then unscrew the threaded ring using the tool (type of screwdriver) by 19 mm.
Pull out the chain tensioner using a 10 mm Allen key, slightly tilting it and turning it to the right.
Chain tensioner — removal and installation (Mercedes-Benz S-Class W126)
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