Greetings all, after changing the rubber seal between the upper and lower front cover of my '91 300SE, a piece of cake repair BTW, I degreased the engine and after the rinse down (engine cold, BTW) the smog pump sounds like a bearing is running dry. The noise decreases at highway speed or acceleration and is most noticeable at idle. It wasn't doing this before the seal change, oil leak seems to be gone whew. What have I done by cleaning the engine?? I checked around the threads but could not find much. Thanks in advance

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1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)

If the problem is the bearing in the pulley in the smog pump, instead of replacing the whole unit, which is very expensive, the dealer sells a rebuild kit, which is basically a replacement pulley with a new bearing. I think they run about $200, whereas a new pump is around $1,000.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

check this thread: http://www.peachparts.com/shopforum/showthread.php?t=145362

Not certain but the smog pump referenced should be the same part as on your car.

I also have a slight whining noise in my engine bay which my mech thinks is the smog pump. The noise doesnt occur all the time though. I have changed all belts and still same noise sometimes. Noise goes away at acceleration or high speed.

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2001 E55

2001 E320 Sedan

2001 Subaru Legacy

2006 SLK280

2016 Subaru Outback 3.6

The "non serviceable" pump is the same for all the M103 engines including the 2.6. That bearing is $19.00 plus tax and shipping.

Paul,
I believe you are thinking about the V8s. THe fiche shows a replaceable bearing for those pumps.

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Auto Zentral Ltd.

Actually, I was thinking about the M104 in my W124 E320. My independent Mercedes shop bought the pulley rebuild kit from the dealer when the bearing went out.

Geeez, you should have heard it. The bearing was squealing so loud, people would cover their ears when I went through a parking lot.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".