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#1
03-03-2017, 05:09 AM
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W124 M104 whiiiiiiiiiiiiiiine
I've got an engine-based whine that starts dead-on 2000rpm and continues to around just under 3000rpm, which equates to 55-60mph in 4th gear. If I let the revs drop off to under 2000 it disappears. Isn't there if I slip into neutral at 60mph, so rev/engine speed dependant. Cruising at 70mph, at 3000prm, all is quiet again.
I've had the belt off and checked all accessories/pulleys etc, nothing untoward, tensioner, alternator idler & fan pulley bracket all recent replacements (noise was there before all of these done), air/smog pump is removed. Engine runs fine, no noise at idle, power good etc. Just that annoying whine. The only thing I've read about that changes on the M104 at 2K is the VVT system, which is engaged at 2000rpm apparently- could that be noisy?
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1993 320TE M104 --------------------------------------------------- past: 1983 230E W123 M102 1994 E300D S124 OM606 (x2) 1967 250SE W108 M129 1972 280se 3.5 W108 M116 1980 280SE W116 M110 1980 350SE W116 M116 1992 300E W124 M103 1994 E280 W124 M104 ---------------------------------------------- "music and women I cannot but give way to, whatever my business" -Pepys 
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#2
03-03-2017, 05:10 AM
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Did someone secretly install a supercharger for you?
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#3
03-03-2017, 05:20 AM
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Quote:
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1993 320TE M104 --------------------------------------------------- past: 1983 230E W123 M102 1994 E300D S124 OM606 (x2) 1967 250SE W108 M129 1972 280se 3.5 W108 M116 1980 280SE W116 M110 1980 350SE W116 M116 1992 300E W124 M103 1994 E280 W124 M104 ---------------------------------------------- "music and women I cannot but give way to, whatever my business" -Pepys
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#4
03-03-2017, 05:24 AM
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W124 M104 whiiiiiiiiiiiiiiine
Problem solved! You're welcome! Lol
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#5
03-03-2017, 05:46 PM
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What is the source of the whine?
If it's coming thru the radio speakers, that can happen if the alternator is failing. 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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#6
03-03-2017, 05:46 PM
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VVT won't make any noise.
It might be a transmission torque converter failing, the can whistle but that is usually over a wider RPM range. Will it make noise in all gears? If you have it in drive, foot brake on and bring the motor to 2,000 ,( torque converter stall test ) will it make noise?
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#7
03-03-2017, 09:20 PM
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I had a whine on my 1994 104 wagon , turned out to be the driveshaft center support bearing
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#8
03-05-2017, 05:14 AM
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Thanks for the replies so far, alternator is new, and it did it before replacement too.
Forgot to say also does it in neutral if the engine is revved to 2000rpm...
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1993 320TE M104 --------------------------------------------------- past: 1983 230E W123 M102 1994 E300D S124 OM606 (x2) 1967 250SE W108 M129 1972 280se 3.5 W108 M116 1980 280SE W116 M110 1980 350SE W116 M116 1992 300E W124 M103 1994 E280 W124 M104 ---------------------------------------------- "music and women I cannot but give way to, whatever my business" -Pepys
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#11
03-07-2017, 07:54 PM
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Had a horrible squeal on my 560SEL that turned out to be the distributor bearings
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-tp 1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS 1988 560SEL "Gunther"- 190K passes anything except a gas station 1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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#12
03-16-2017, 10:01 AM
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Still got it, I've made a sound recording if anyone fancies a listen- the noise comes in after about 5 secs, that's as I go over 2000rpm...
https://soundcloud.com/user-468757519/whiiiine
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1993 320TE M104 --------------------------------------------------- past: 1983 230E W123 M102 1994 E300D S124 OM606 (x2) 1967 250SE W108 M129 1972 280se 3.5 W108 M116 1980 280SE W116 M110 1980 350SE W116 M116 1992 300E W124 M103 1994 E280 W124 M104 ---------------------------------------------- "music and women I cannot but give way to, whatever my business" -Pepys
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#14
03-17-2017, 02:03 AM
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My 94 e320 estate whines as well but it does it around 40-45mph when coasting or decel down a hill. It's actually more of a whirring noise like the jetsons if anything, really only does it first time out in the morning, so I forget about it after the first few miles. I feel like it's coming from the transmission..
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97 e300d, 78 300Dt, 95 E300d, 94 E320 estate
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#15
08-24-2017, 05:12 AM
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Just an update in case anyone is reading this in the future- the whine turned out to be the viscous fan coupling. It was a Chinese made one fitted by a previous owner. Fitted a genuine BEHR and all is quiet again!
__________________
1993 320TE M104 --------------------------------------------------- past: 1983 230E W123 M102 1994 E300D S124 OM606 (x2) 1967 250SE W108 M129 1972 280se 3.5 W108 M116 1980 280SE W116 M110 1980 350SE W116 M116 1992 300E W124 M103 1994 E280 W124 M104 ---------------------------------------------- "music and women I cannot but give way to, whatever my business" -Pepys
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