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#1
10-01-2007, 11:22 PM
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w126 300SD squealing while accellerating at any speed
Hello All...
interesting issue with my 1985 300SD: Squealing noise (almost seems boost-related) while accelerating. The turbo has almost no lateral play to speak of and boost builds rapidly; as it should to factory spec of 0.8bar. This squealing noise seems louder when the engine is not at full-operating-temperature in the morning but maybe it's just my ears/mind fooling me. Oil change with Amsoil, etc and checking for oil leaks around turbo/oil lines = no difference. I noticed the noise this evening while driving with the roof and windows open even at full-operating-temp and decided it was time to ask  the experts! Anyone heard,seen, or experienced this issue? I've quickly inspected the turbo for shaft-play (as stated earlier), and given the intake gaskets, etc a once-over but haven't found anything which looks to be the cause just yet. I'd like to get this corrected before it gets any worse or causes damage which requires major down-time. Any pointers will be sincerely appreciated! 
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Erik deVries ASE Certified Automation Engineer 1985 Mercedes 300SD 375,xxx miles, Euro-headlamps, Bosch HID, Boston/Alpine audio 1982 Mercedes 300D 358,000 miles Boston audio, FOR SALE 1997 Dodge 2500 4x4 long bed ext cab Cummins 5.9L, BFAF, ATS trans, billet converter, #0 torque plate full-forward, star wheel full forward, (~295HP & ~680lb/ft G-tech), 5-inch turbo-back exhaust, VIAIR on-board air, LOUD Nathan K5 TRAIN HORNS  , 35-inch; BFG Mud Terrain, 2006 Ram 2500 17-inch Aluminum wheels.
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#2
10-02-2007, 12:16 AM
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Did you check your belts? AN alternator belt loose can do this. Also check for loose or missing ehxaust manafold bolts.
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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.
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#3
10-02-2007, 05:03 AM
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I second the Alternator belt check. I had the same issue and found that one of the two belts had stretched. Replaced them both and the noise went away.
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad 
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#4
10-02-2007, 10:08 AM
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yup. alternator belt... and don't figure it's ok, just because it's tight. it has to be in good shape too. get a MATCHED pair of new belts in there.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#5
10-02-2007, 12:49 PM
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you said it may be boost related so it might be the ARV.
The best way to check this is to have someone (you trust  ) put it in drive and apply the brakes and accelerator while you search for the squeal under the hood.
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green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday  )(  Kalifornistani emissons )white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank) desert storm primer 63 T-bird "The Undead" (long term hibernation) http://ecomodder.com/forum/fe-graphs/sig692a.png
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#6
10-02-2007, 02:29 PM
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Quote:
Add w/e-brake applied also...not pointed towards the house or other objects.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D
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#7
10-02-2007, 03:11 PM
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YOu have an 85... it IS the ARV. I know everyone will tell you belts, but I bet it's the ARV since it sounds like you noticed it was boost related. ARV= Air Recirculation Valve... its an emmisions only devise to allow a large enough flow through the EGR during certain boost levels... it HOLDS BACK boost and limits power when it's open... I took it apart when I had the turbo off and plugged it permantly, but the plug will do it.
See that blue line going into the side of the turbocharger compressor?? Pull it off and put a BB into the rubber connector and smile as the squeeling goes away.
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1985 300D Mango Green with 16" Pentas, Vogtland springs, Euros/ clear corners, 234k, lots to come soon....
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#8
10-03-2007, 05:32 PM
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thanks for all the replies!
forgot to add the fact that all belts are brand new and properly tensioned... I already (accidentally) have BB's in the EGR and ARV lines
 ....(for safety reasons, of course!) Maybe one of the lines is split or cracked. Will check it this evening. Thank you all very much for the input! Now if I could just get the cruise to work at speeds over 70MPH... (please see my other posting, if anyone has a clue as to the cause of this after trying 3 different reman. amps  ...)thanks again! Erik d.
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Erik deVries ASE Certified Automation Engineer 1985 Mercedes 300SD 375,xxx miles, Euro-headlamps, Bosch HID, Boston/Alpine audio 1982 Mercedes 300D 358,000 miles Boston audio, FOR SALE 1997 Dodge 2500 4x4 long bed ext cab Cummins 5.9L, BFAF, ATS trans, billet converter, #0 torque plate full-forward, star wheel full forward, (~295HP & ~680lb/ft G-tech), 5-inch turbo-back exhaust, VIAIR on-board air, LOUD Nathan K5 TRAIN HORNS , 35-inch; BFG Mud Terrain, 2006 Ram 2500 17-inch Aluminum wheels.
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#9
10-05-2007, 09:16 PM
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no hoses/tubing found loose or damaged. Belts all secure. Still squealing....
__________________
Erik deVries ASE Certified Automation Engineer 1985 Mercedes 300SD 375,xxx miles, Euro-headlamps, Bosch HID, Boston/Alpine audio 1982 Mercedes 300D 358,000 miles Boston audio, FOR SALE 1997 Dodge 2500 4x4 long bed ext cab Cummins 5.9L, BFAF, ATS trans, billet converter, #0 torque plate full-forward, star wheel full forward, (~295HP & ~680lb/ft G-tech), 5-inch turbo-back exhaust, VIAIR on-board air, LOUD Nathan K5 TRAIN HORNS , 35-inch; BFG Mud Terrain, 2006 Ram 2500 17-inch Aluminum wheels.
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