Hello Everyone:

Just bought a 95 E320 with 119,xxx miles. It makes a noise at start up when it is cold. It sounds like some sort of pump is running. The noise stops after about 2 or 3 minutes. The noise sounds like it is coming from the front of the engine, around where the fan is. By the time I take it to my mechanic, the noise will be gone. Any ideas?

Thanks,

Jimmy

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1995 E 320 119,000
1983 300 TD 285,000 (sold)
1973 220D (sold)

Air Pump...
..Normal

thanks!

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1995 E 320 119,000
1983 300 TD 285,000 (sold)
1973 220D (sold)

...you Bet .

Could be the oil flowing through the oil tube that was too small for this and the '94 E class too. But your in LA. This noise usually happens when it is on the cool side overnight. No harm done from this either.

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles

The oil tubes are an issue on M119 V8's, not M104's.

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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".

The cold oil whine noise from 104 eng is the oil pump .
There is a factory internal mod to change the gears to a 4mm smaller size, but not really needed.. ie. no harm done.
..This is a different noise than from the Air-Pump , and AP
is prolly your noise , as it is coming from the front.
OP can be heard from cabin.