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Old 04-26-2000, 06:06 PM
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I have a 1991 300D 2.5 turbo diesel with 165K on the clock. When I first bought the car and had it checked out by a MBZ mechanic all was ok, including the diesel clatter. Today I rode in my friends 1983 300D and his diesel clatter is considerable quiter. Any explanation, is this normal?

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Old 04-26-2000, 06:37 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
My gut feeling is to ignore it as long as the car starts well (with no misfires afterward) and performs well.

I would use a catalytic fuel additive like redline to be sure you don't just have a minor injector/carbon problem.

We have found that delivery valve leaks internally in the pump will cause idle knocking. It doesn't seem to matter and the solution is fairly easy, but there is no way to know but to do it. Its probably not a DIYer job. The elements require a special socket to torque them (a retorque often solves the problem alone).
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Old 04-26-2000, 09:36 PM
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The car starts instantly, does not use oil, get 41MPG and runs like a champ, but I just though that since mine was a later model than my friends (more than 10 years), it should be quieter.
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Old 04-26-2000, 10:41 PM
fz500sel's Avatar
Happy now in paradise!
Join Date: Nov 1999
Location: Venice, FL - "sharktooth capital of the world"
Posts: 712
How long had your friends been running when you got in it and listened to it?

I find that my '85 300D (269K) does have more clatter when it first fires up but after it gets going and has been running awhile it quiets down considerably?

84 500SEL EURO 87K
85 300D 267K (and still goin' strong)
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Old 04-26-2000, 10:43 PM
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His car had been running for a 30 minutes or so. Mine does not quiet down after warming up. I have been told that my car is supposed to sound like this. I never thought it was too loud, until I listened to my friend's car today. His was very quiet.
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Old 04-27-2000, 07:36 AM
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You're comparing apples to oranges, these are two completely different engine designs. Just enjoy it. This is like having your music volume turned up louder.

Have a great day,

Larry Bible
'84 Euro 240D, 516K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles

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