Tapping noise when cold start OM642

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MartiniNight

Active Member
Joined
Oct 18, 2020
Messages
67
Location
Newcastle
Car
350 cls
Hello Friends, i have a problem;
When my CLS 350 cdi is starting/cranking from cold i can hear a loud tapping sound from the engine lasts 3-4 seconds until the car start.
After that starts and re-starts fine with no nnoise.
Only happens when engine is cold mainly when left overnigh
Any ideas?
Thanks in advance
 
Probably injector noise. Stretched chain would bemore like a rattle, but if your engine has oil filler hole front of the engine, you can check tensioner extraction (=chain stretch). Pictures/links posted on various posts/forums.
 

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