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#1
07-10-2005, 05:08 PM
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couple hours reading in search mode - must have
missed it. My '81 300SD give me a clickity/ratchety sound from somewhere underneath, coasting, with foot off the go pedal, in gear. Sound goes away when neutral is selected while coasting. Any ideas?
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Jim '49 170?(donated to church in Darmstadt '58) '58 220S(crusher, after '73 fire[San Antonio]) '72 280SE 4.5 '77 240D '81 300SD '83 240D parts car 
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#2
07-10-2005, 05:27 PM
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Could it be the speedo cable needing lubrication ?
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#3
07-10-2005, 05:35 PM
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It's kinda like that sound but it's from underneath & I think
to the rear. I don't think that cable stops in neutral while coasting?? Seems to be associated with driveshaft/wheel rotation - but neither of those stop while rolling. This noise is not loud and I can only hear it with alll the window up, radio off,AC off('course that is with almost 71yr old ears....).
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Jim '49 170?(donated to church in Darmstadt '58) '58 220S(crusher, after '73 fire[San Antonio]) '72 280SE 4.5 '77 240D '81 300SD '83 240D parts car
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#5
07-10-2005, 06:05 PM
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Bad speedo cable is possible, but.
Quote:
PART NUMBER SEARCH RESULTS WITH PRICES Vehicle 1981 Mercedes Benz 300SD Part: Flex Disc Note: W/ Mounting Hardware Front : Rear K1020-16594 Flex Disc Lemforder IN STOCK $51.48 K1020-16594 Flex Disc Febi IN STOCK $44.90 http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1JH0K424Y1KA12ND8D&year=1981&make=MB&model=300-SD-002&category=K&part=Flex+Disc
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/
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#6
07-10-2005, 06:27 PM
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If the sound is coming from the rear of the car it may be a nick on the pinoin. Mine did that but drove it anyway.
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1984 280SEL, 62,000 miles Euro model in the USA 1983 300D (Totaled out 10/2004)  New Factory Mint Green paint Palomino int 1982 240D (Steak dinner for two) 
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#7
07-11-2005, 05:55 PM
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Sure sounds like a CV joint. Especially true if it is more of a clunking sound, sometimes even a click click thump click......
Try this to test it. 1. APPLY PARKING BRAKE 2. Get assistant 3. Start engine. 4. Get in a safe position so you can look at the cv joints 5. Have assistant move gear selector from drive to reverse every few seconds MAKING SURE SERVICE BRAKE IS APPLIED 6. Watch for movement of axles. You will see them moving around if they are bad. 7. After shutting down engine check the dust boots for cracks ect
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1983 Mercedes 300SD 1987 Mercedes 300SDL 2001 VW Passat 2.8 AWD 2007 OM642 Jeep WK 4x4 
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#8
07-11-2005, 09:21 PM
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I don't think it's a speedo cable...
unless the '81 is different than my '84. My speedometer is electronic.
Have you inspected the flex-discs?
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Sam 84 300SD 350K+ miles ( Blue Belle )
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