I've noticed that the 603 seems to be louder at idle than my 617. At first I was pretty worried about the timing chain and what-not but after checking for stretch (less than 1.5°) I got to thinking more.

Could my tensioner be going bad? I'd assume it was replaced with the chain a while back due to milage. Oil pressure is ~2bar, hot idle.

Are the hyd lifters just that loud over the 617?

Do the injectors deliver fuel at a different pressure?

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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