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Welcome to the forum redjim,
as you can see we are a friendly group & always willing to help.
I dont know how mechanical you are, at least you realized the noise was a problem.
I would use a large screw driver as a stethoscope & place the end on the vac pump & see if the noise is coming from there. If not, you can listen to various spots on the motor to see if you can hear where the noise is loudest. I am always concerned with taking a car to a dealer, experience has shown me dealer mechanics have a "replace things till it is fixed mentality". You really need to find a good old mercedes benz mechanic.
If you try the injector line loosen it may lead to one cylinder.
Once you have tried finding the noise, please get back to us & we can offer more suggestions.
Good Luck !!
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Grumpy Old Diesel Owners Club group
I no longer question authority, I annoy authority. More effect, less effort....
1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles 
1987 250td 160k miles English import 
2001 jeep turbo diesel 130k miles 
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving
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