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  #1  
Old 08-29-2010, 10:57 PM
JHZR2's Avatar
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Location: New Jersey
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harmonics on the air cleaner

Hello,

In messing with my idle and rack dampener, I found that there were some idle speeds and situations where the air cleaner will vibrate so violently that it will hit the side of the valve cover.

I have a pretty new air cleaner mount, and all the rubber connectors are brand new...

Has anyone else experienced this? The clanging noise of the air cleaner hitting the valvecover?

The worst part of it is that the best perceived idle is at a speed/setting where the air cleaner will sometimes do this.

The weird part is that the air cleaner will not jst do this naturally, it takes some change in load, like the AC coming on or shifting from drive to neutral for it to happen... And then if you make a slight change, like goose the throttle or something, it will stop.

Anyone experience this?

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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  #2  
Old 08-29-2010, 11:05 PM
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Yes, and that's the main reason why the air cleaner mounts and brackets fail so often, they're violently shaken to death!

Here's the fix.
http://www.peachparts.com/shopforum/showpost.php?p=622208&postcount=8

Also, read this. The late Marshall Booth provided this quote from the late Randy Durrance on another MB forum some years ago.

Quote:
"The air filter mount problem has existed long enough. This is the
repair.....
Looking at the air cleaner, notice the small space between the air cleaner
and the valve cover. There is a flat area on the air cleaner housing near the
valve cover. The repair requires an old rubber shock absorber mount, a 6 mm
bolt (10 mm hex) about 10 to 12 mm long, flat washers and a nut. Make a mark
on the forward area of the flat side of the air cleaner housing (toward the
valve cover). Remove the air cleaner housing and drill a 6 mm hole at the spot
you marked. Put the bolt in the hole from the inside using the washers and
nut. Now you have a bolt sticking out of the air cleaner housing... Take an
old rubber doughnut from a shock absorber and stick it over the protruding
bolt/nut. Be sure the bolt does not stick out of the rubber.
Reinstall the housing and viola the air cleaner housing is unable to generate
enough momentum to break the bracket. I've been doing this for about 8
years....never had a second air cleaner bracket break.
The idea is to limit the movement of the housing. Even when they were new the
brackets were prone to failure.
Regards,
Randy D."
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  #3  
Old 08-30-2010, 09:55 PM
JHZR2's Avatar
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Location: New Jersey
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I had done the same thing with foam. This is a better idea. Thanks!
__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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  #4  
Old 08-30-2010, 11:17 PM
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Location: Long Beach,CA
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Some place there is another thread where you put a piece of Heater Hose between the Intake Manifold and the Air Filter Housing.
That worked for me but I do not remember what size hose I used.
With the above method you do not need to drill; but I did glue mine down.
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  #5  
Old 08-31-2010, 03:49 PM
1984 300SD
 
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Location: Vancouver BC
Posts: 588
Or, you can saw 3/16" of the bracket that is bolted to the top of the valve cover. That will provide enough clearance.

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