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#1
05-22-2008, 11:47 AM
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Turbo noise diagnosis?
I used to be able to hear my turbo whistle ever since I bought the car.
Seems now the whistle has been replaced by a noise similiar to when one uses the "canned air" for cleaning computer keyboards. The car runs and drives fine. I did a valve adjustment 2 weeks ago. This noise only happens as the turbo spools up, and abates when you reach cruising speed. At 70 mph, I can hear it just a bit, it dissappears when I let off the accelerator, but increases when I accelerate, even at 70. I tried listenening with the window down, but nothing abnormal. I can only really hear it with the windows closed. It appear to be coming from the passenger side as I would expect. Any ideas on what to check? I wonder if the intake gasket is leaking... Thanks!
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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. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K 
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#2
05-22-2008, 11:59 AM
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My Jetta TDI whistles as it spools up then "hisses" when the wastegate opens at full boost. It sounds like yours is hissing the whole time during acceleration, eh? And you have normal boost, it sounds like? Strange...
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1992 300D 2.5T 1980 Euro 300D (sadly, sold) 1998 Jetta TDI, 132K "Rudy" 1974 Triumph TR6 1999 Saab 9-5 wagon (wife's)
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#3
05-22-2008, 12:21 PM
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You probably have a leak in the manifold side. I just had/fixed the same problem with my w126. Turns out it was one of the large rubber o-rings between the compressor on the turbo and the cross-over tube.
They can sound really weird...the guy at my turbo shop here said he has even seen them whistle like a siren on an ambulance.
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My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much) Wife's - '08 Saab Sportcombi Aero Riding a '03 Yamaha Warrior
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#4
05-22-2008, 01:46 PM
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I do not think the OM617 has a crossover tube. Please elaborate, as I have been wrong many times before.
The seals on the U-tube have been replaced, as has the air filter, etc a few weeks ago. This just started on Tuesday. Also the turbo shaft spins freely, and there is no side to side play, but you can just feel end to end play. Yes, it is strange. Thanks!
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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. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#5
05-22-2008, 03:34 PM
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Take some soapy water to the intake and exhaust gaskets and see if they bubble under boost load.
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#6
05-22-2008, 04:00 PM
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Quote:
__________________
RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#7
05-22-2008, 04:19 PM
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Quote:
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#8
05-22-2008, 04:23 PM
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Ah, I see...well that is what a helper is for...
__________________
RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#9
05-23-2008, 09:19 AM
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Noise problem cured
The noise turned out to be caused by the EGR. The bolts had worked loose, and exhaust was pouring into the engine compartment, under acceleration.
Well, time for a blocking kit. I just need to get dimensions and I can get it made for free from stainless steel. The barter system works great, I think. I trade computer repair work for metal shop work.
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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. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#10
05-23-2008, 10:16 AM
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Thats a nice setup. (the bartering)
The word on the street is that a quarter fits in there just right with lots of hitemp RVT.
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#11
05-23-2008, 10:27 AM
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Winmutt, does the quarter go in the clamp on the exhaust manifold outlet?
__________________
RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#12
05-23-2008, 11:28 AM
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Quote:
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#13
05-23-2008, 05:04 PM
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hmm, I haven't heard of that one. I just cut the block plates out of a thin piece of tin, then new gaskets out of the roll you buy at autozone. Takes about 20 min total.
Just for the record, I know the 617 doesn't have a cross-over bar, that was the problem I had with my 603.
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My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much) Wife's - '08 Saab Sportcombi Aero Riding a '03 Yamaha Warrior
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