It sounds like the mechanic needs to read the FSM

It is very simple.

Cam timing is checked via the "2mm lift" method

PeachPartsWiki: Measuring Timing Chain Stretch

If you try to align the cam mark with the crank markings on a used OM617 chain then you are a ****ing donkey

After this has been checked

Do this

PeachPartsWiki: How to Set IP Timing via the Drip Tube Method

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!