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#1
12-16-2006, 01:19 PM
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81 CD whistles
My 81 300CD just yesterday developed a whistle noise from under hood at about 35 mph. If I put it in neutral, the noise quits? Its not a belt squeal, more like an air whistle. Climate controls are set to ECON so no A/C compressor engagement. I could recreate it 3 out of 5 times at 35 mph and 3 times it would quit putting it in neutral. So I know its engine RPM related. Louder driving next to a sound wall as I leave work. Any ideas? Its rather difficult to have someone riding on the fender at 35 mph to locate the noise And I cannt get it to do it revving the engine.
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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE. 
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#2
12-16-2006, 01:45 PM
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My first thought would be the trubo if you have one. Just the sound of it spoolong up and when you put it in neurtal the engine goes back to idle so the turbo slows down and does not compress the air as much
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-Trevor OBK #12 1980 300SD 333,XXX miles - Totaled 1986 Mazda RX-7 212,XXX miles - impounded and auctioned off 2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto
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#3
12-16-2006, 02:31 PM
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I've got the same problem on my 300sd. I've been told its the intake manifold gasket.
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"spreading a trail of obnoxious where ever we go" 1981 300sd w/ 341,500 miles http://www.wecrash.com/pics/ddda_banner.gif
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#4
12-16-2006, 03:08 PM
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1981 300CD. not a turbo! I will check the intake gasket, thanks!!!
__________________
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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#5
12-16-2006, 03:12 PM
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shows how much i know about options on cars other my model
 ... that was just a guess ya never know what people do to their cars. i am sure there is one out there somewhere
__________________
-Trevor OBK #12 1980 300SD 333,XXX miles - Totaled 1986 Mazda RX-7 212,XXX miles - impounded and auctioned off 2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto
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#6
12-16-2006, 04:14 PM
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A whistle is a sucking leak... so typically it is associated with the intake manifold... get some 30 weight oil in a squirt can and when it is doing that squirt at the gaskets associated with the intake manifold.. when it stops you know where it is...
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#7
12-16-2006, 05:25 PM
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Great idea! hope I can get it to do it without having to drive it?
__________________
81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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