My 83 300D has developed a noticeable whine when the RPM's reach 2300. I'm suspecting a turbo issue since that's about when the wastegate opens. So I inspected the compressor wheel tonite and it seems to spin freely with little to no axial or radial play. Searching the thread archives really doesn't return anything about whine noise increases. I'll check the boost tomorrow. Any thoughts on increase turbo whine?

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1983 M-B 300D, 148K, daughter's ride
1983 M-B 300TD, 120K, my ride
1985 M-B 300SD, 102K, wife's ride
1969 HD FLH, 45K, restored/hobby
1996 Chev Suburban, family taxi/tow vehicle
1990 John Deere Model 240
1942 John Deere Model LA
1985 16' 4Winns ski boat

check the bypass hose, it may be split causing the noise.

ok, but if you could explain where the bypass hose is located it would be much appreciated. Thanks.

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1983 M-B 300D, 148K, daughter's ride
1983 M-B 300TD, 120K, my ride
1985 M-B 300SD, 102K, wife's ride
1969 HD FLH, 45K, restored/hobby
1996 Chev Suburban, family taxi/tow vehicle
1990 John Deere Model 240
1942 John Deere Model LA
1985 16' 4Winns ski boat

Also check the fitting of the U-tube that goes from the air cleaner housing to the turbo, if it's loose, then you'll hear the turbo. Mine is cracked and worn on the 300D, so I'll be replacing mine soon.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

the U-tube is in good shape plus i double checked the clamps and fit when i looked at the wheel tonite. thanks for the help, though.

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1983 M-B 300D, 148K, daughter's ride
1983 M-B 300TD, 120K, my ride
1985 M-B 300SD, 102K, wife's ride
1969 HD FLH, 45K, restored/hobby
1996 Chev Suburban, family taxi/tow vehicle
1990 John Deere Model 240
1942 John Deere Model LA
1985 16' 4Winns ski boat

it is the small diameter rubber hose near the front of the unit

thanks. i heard also the the air recirc valve could be the source of the problem and disconnecting the vac hose (like i did on the egr) may help. any thoughts there?

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1983 M-B 300D, 148K, daughter's ride
1983 M-B 300TD, 120K, my ride
1985 M-B 300SD, 102K, wife's ride
1969 HD FLH, 45K, restored/hobby
1996 Chev Suburban, family taxi/tow vehicle
1990 John Deere Model 240
1942 John Deere Model LA
1985 16' 4Winns ski boat

the answer to the last question, but agree with the idea athat it is an air gap somewhere and not to worry too much about the turbo itself at least at first because they are extremely durable and not usually a source of trouble. i once rebuilt one because i started hearing a whining noise.... of course after all that i still whinned.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.