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  #1  
Old 05-22-2008, 12:47 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
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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Seems now the whistle has been replaced by a noise similiar to when one uses the "canned air" for cleaning computer keyboards.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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70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

82 300D 322K My Daily Driver-Warndreicke in the trunk. Trip ODO still working!

90 Dodge D250 5.9 Cummins/5 speed. 350K
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  #2  
Old 05-22-2008, 12:59 PM
cscmc1's Avatar
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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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  #3  
Old 05-22-2008, 01:21 PM
lowriderdog37's Avatar
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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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  #4  
Old 05-22-2008, 02:46 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
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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 SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

82 300D 322K My Daily Driver-Warndreicke in the trunk. Trip ODO still working!

90 Dodge D250 5.9 Cummins/5 speed. 350K
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  #5  
Old 05-22-2008, 04:34 PM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
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Take some soapy water to the intake and exhaust gaskets and see if they bubble under boost load.
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1991 300D Nearly Perfect
1994 E320 Cabriolet
1995 E320 Touring
2001 Eurovan FOR SALE
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  #6  
Old 05-22-2008, 05:00 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
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Quote:
Originally Posted by winmutt View Post
Take some soapy water to the intake and exhaust gaskets and see if they bubble under boost load.
How can you get it under boost load with the car in park?
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RRGrassi


70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

82 300D 322K My Daily Driver-Warndreicke in the trunk. Trip ODO still working!

90 Dodge D250 5.9 Cummins/5 speed. 350K
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  #7  
Old 05-22-2008, 05:19 PM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
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Quote:
Originally Posted by rrgrassi View Post
How can you get it under boost load with the car in park?
Clearly not in park. Per FSM put your foot on brake and put your other foot on accel. I know scary but its in the FSM.
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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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  #8  
Old 05-22-2008, 05:23 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
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Ah, I see...well that is what a helper is for...
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RRGrassi


70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

82 300D 322K My Daily Driver-Warndreicke in the trunk. Trip ODO still working!

90 Dodge D250 5.9 Cummins/5 speed. 350K
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  #9  
Old 05-23-2008, 10:19 AM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
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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 SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

82 300D 322K My Daily Driver-Warndreicke in the trunk. Trip ODO still working!

90 Dodge D250 5.9 Cummins/5 speed. 350K
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  #10  
Old 05-23-2008, 11:16 AM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,321
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.
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http://superturbodiesel.com/images/sig.04.10.jpg
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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  #11  
Old 05-23-2008, 11:27 AM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
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Winmutt, does the quarter go in the clamp on the exhaust manifold outlet?
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RRGrassi


70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 210K miles

82 300D 322K My Daily Driver-Warndreicke in the trunk. Trip ODO still working!

90 Dodge D250 5.9 Cummins/5 speed. 350K
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  #12  
Old 05-23-2008, 12:28 PM
winmutt's Avatar
85 300D 4spd+tow+h4
 
Join Date: Apr 2006
Location: Atl Gawga
Posts: 9,321
Quote:
Originally Posted by rrgrassi View Post
Winmutt, does the quarter go in the clamp on the exhaust manifold outlet?
Intake manifold, remove bolts, pull off the EGR, apply a decent amount of hitemp RVT, insert quarter, more RVT bolt her down.
__________________
http://superturbodiesel.com/images/sig.04.10.jpg
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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  #13  
Old 05-23-2008, 06:04 PM
lowriderdog37's Avatar
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Join Date: Mar 2007
Location: Viera, FL
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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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