The OM606NA engine in the 1995 (W124) and 1996-97 (W210) E300 has a plastic cover over the injectors; having never operated either car ('95 or '96) without the cover I don't know how much effect it has on noise. I wonder if some foam insulation around the injectors under the cover would make the sound reduction even better?

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

I'm not familiar enough with the 606 engine to say but high density closed cell foam is a very effective noise barrier and heat resistant enough to place on the engine as long as its not touching the exhaust.

BTW, anybody looking for a not cheap W124 diesel 5 speed.
http://inlandempire.craigslist.org/cto/3877675171.html
I have no connection with the seller, I just found it.

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CENSORED due to not family friendly words

I wonder how much additional sound reduction we might realize by using the same closed cell foam as a hood pad AND as a direct cover over the injectors.

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http://i284.photobucket.com/albums/l...aman/Fleet.jpg

Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
92 300D 2.5 Turbo
92 300TE 4Matic

What about the pump? Seems they throw some noise too, ever watch one on a test bench? Hella racket. Doesn't bother me but I'm half deaf so maybe I'm not the best metric.

Heh, heh, heh.
Welcome to the dark side.....

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles

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'98 E300 Turbo "Juliette"
'85 Federal 300TD

The hood pad is fairly effective as far as I can tell. On my car the majority of the engine noise comes from underneath the car and the grill. Nothing I can do about the grill, but I'm planning to use the same foam to insulate the 300e undertray I'm using. I think the original OM603 under tray was insulated.
Yes, the injection pump makes some noise as well but its mostly drowned out by the injectors. Trying to insulate the IP seemed like more trouble than its worth.

I'll get some pics of the insulation when I swap out the injectors in a few days.

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CENSORED due to not family friendly words