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Old 09-11-2008, 11:14 PM
winmutt's Avatar
85 300D 4spd+tow+h4
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,331
81 240D Auto, god awful ringing racket at the front of engine.

I am looking at buying an 81 240d for my Dad as a replacement for his wrecked Honda. Trying to turn him to the dark (light?) side. At any rate. Car is in great condition with one exception, makes this god awful singing/jingling from the front of the engine at idle. Barely off idle it goes away. I was able to verify it wasn't the PS. PO says that the AC doesnt work and I noticed that the ALT belt was jumping at idle.

Any ideas? Water Pump? Vac? Again off idle goes away and purrs like a kitten.

1987 300D Sturmmachine
1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
1985 300D car, sold and missed.
OBK #42
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Old 09-11-2008, 11:38 PM
Posts: n/a
Loose alternator fan would be my first guess.
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Old 09-11-2008, 11:51 PM
Palangi's Avatar
L' Résistance
Join Date: Dec 2000
Location: Republique de Banana
Posts: 3,496
My 240D used to make a ringing sound during acceleration from about 1500 to 2000 rpm (estimated). I never did find it. Eventually it stopped doing it. I was always suspicious of the alternator mounting bracket, but I never could actually pinpoint the source.

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg

0BAMA .......... OUTHOUSE
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Old 09-12-2008, 12:13 AM
JimmyL's Avatar
Rogue T Intolerant!!!
Join Date: May 2004
Location: Sunnyvale, Texas (DFW)
Posts: 9,673
I had an AC compressor making a noise that could be described that way when I first purchased my white wagon. The clutch was just loose and near destroyed.....
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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Old 09-12-2008, 12:19 AM
rcounts's Avatar
Registered User
Join Date: Mar 2008
Location: Kent, WA
Posts: 1,189
I'll vote for a pulley with loose mounting nut)s)/bolt(s). I've seen idlers, ps, ac, alt, wp, pretty much any/all kinds of pulleys loose and rattling on their shafts, and they almost always make a ringing noise of one tone or another...
1984 300 Coupe TurboDiesel
Silver blue paint over navy blue interior
2nd owner & 2nd engine in an otherwise
99% original unmolested car
~210k miles on the clock

1986 Ford F250 4x4 Supercab
Charcoal & blue two tone paint over burgundy interior
Banks turbo, DRW, ZF-5 & SMF conversion
152k on the clock - actual mileage unknown
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Old 09-12-2008, 10:17 AM
Registered User
Join Date: Jan 2001
Location: Alexandria, Virginia
Posts: 5,446
Check the altenator and it's mounting for loose, broken or missing bolts, including hollowed-out bolt holes in the alternator and mounting bracket. Check all the clips around the oil-pan that support the steel tranny cooler lines. Check the AC compressor and bracket for same as the alternator, and check the engine oil-cooler lines for any loose or missing support hardware, including the clamp & bolt that secures the lines to the AC compressor bracket. All these items needed attention on my '82 automatic 249D!

Happy Motoring, Mark
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Old 09-12-2008, 11:05 AM
79Mercy's Avatar
Registered User
Join Date: Mar 2008
Location: Florida
Posts: 4,128
could be a siezing front crank bearing. I'd start taking the belts off.

1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles
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